Merge branch 'master' into feature/add-postgres-point-in-time-recovery-backup-config

Fix: remove deprecated quoted references

.circleci/config.yml

@@ -1,13 +1,13 @@
 defaults: &defaults
   machine: true
   environment:
-    GRUNTWORK_INSTALLER_VERSION: v0.0.21
+    GRUNTWORK_INSTALLER_VERSION: v0.0.25
     TERRATEST_LOG_PARSER_VERSION: v0.13.24
-    MODULE_CI_VERSION: v0.13.3
-    TERRAFORM_VERSION: 0.11.8
+    MODULE_CI_VERSION: v0.18.4
+    TERRAFORM_VERSION: 0.12.23
     TERRAGRUNT_VERSION: NONE
     PACKER_VERSION: NONE
-    GOLANG_VERSION: 1.11.2
+    GOLANG_VERSION: 1.13.8
 
 install_gruntwork_utils: &install_gruntwork_utils
   name: install gruntwork utils
@@ -16,35 +16,23 @@ install_gruntwork_utils: &install_gruntwork_utils
     gruntwork-install --module-name "gruntwork-module-circleci-helpers" --repo "https://github.com/gruntwork-io/module-ci" --tag "${MODULE_CI_VERSION}"
     gruntwork-install --binary-name "terratest_log_parser" --repo "https://github.com/gruntwork-io/terratest" --tag "${TERRATEST_LOG_PARSER_VERSION}"
     configure-environment-for-gruntwork-module \
-      --circle-ci-2-machine-executor \
       --terraform-version ${TERRAFORM_VERSION} \
       --terragrunt-version ${TERRAGRUNT_VERSION} \
       --packer-version ${PACKER_VERSION} \
-      --use-go-dep \
-      --go-version ${GOLANG_VERSION} \
-      --go-src-path test
+      --go-version ${GOLANG_VERSION}
 version: 2
 jobs:
   build:
     <<: *defaults
     steps:
       - checkout
-      - restore_cache:
-          keys:
-            - dep-v1-{{ checksum "test/Gopkg.lock" }}
-
       # Install gruntwork utilities
       - run:
           <<: *install_gruntwork_utils
 
-      - save_cache:
-          key: dep-v1-{{ checksum "test/Gopkg.lock" }}
-          paths:
-            - ./test/vendor
-
       # Fail the build if the pre-commit hooks don't pass. Note: if you run pre-commit install locally, these hooks will
       # execute automatically every time before you commit, ensuring the build never fails at this step!
-      - run: pip install pre-commit==1.11.2
+      - run: pip install pre-commit==1.11.2 cfgv==2.0.1 yapf
       - run: pre-commit install
       - run: pre-commit run --all-files
 
@@ -99,4 +87,4 @@ workflows:
       - build
       - test:
           requires:
-            - build
+            - build

CODEOWNERS

@@ -1 +1 @@
-* @autero1 @robmorgan @yorinasub17
+* @robmorgan @yorinasub17

CONTRIBUTING.md

@@ -1,5 +1,9 @@
 # Contribution Guidelines
 
+<!-- NOTE: We use absolute linking here instead of relative linking, because the terraform registry does not support
+           relative linking correctly.
+-->
+
 Contributions to this Module are very welcome! We follow a fairly standard [pull request process](
 https://help.github.com/articles/about-pull-requests/) for contributions, subject to the following guidelines:
  

README.md

@@ -1,94 +1,105 @@
-[![Maintained by Gruntwork.io](https://img.shields.io/badge/maintained%20by-gruntwork.io-%235849a6.svg)](https://gruntwork.io/?ref=repo_google_cloudsql)
-
+<!--
+:type: service
+:name: Google Cloud SQL
+:description: Run MySQL or PostgreSQL on Google's Cloud SQL Service. Supports read replicas, multi-zone automatic failover, and automatic backup.
+:icon: /_docs/cloud-sql-icon.png
+:category: database
+:cloud: gcp
+:tags: database, mysql, postgresql
+:license: open-source
+:built-with: terraform
+-->
 # Cloud SQL Modules
+[![Maintained by Gruntwork.io](https://img.shields.io/badge/maintained%20by-gruntwork.io-%235849a6.svg)](https://gruntwork.io/?ref=repo_google_cloudsql)
+[![GitHub tag (latest SemVer)](https://img.shields.io/github/tag/gruntwork-io/terraform-google-sql.svg?label=latest)](http://github.com/gruntwork-io/terraform-google-sql/releases/latest)
+![Terraform Version](https://img.shields.io/badge/tf-%3E%3D0.12.0-blue.svg)
 
 This repo contains modules for running relational databases such as MySQL and PostgreSQL on
 [Google Cloud Platform (GCP)](https://cloud.google.com/) using [Cloud SQL](https://cloud.google.com/sql/).
 
-## Quickstart
+## Cloud SQL Architecture
 
-If you want to quickly spin up a Cloud SQL database, you can run the example that is in the root of this repo. Check out
-[postgres-private-ip example documentation](https://github.com/gruntwork-io/terraform-google-sql/blob/master/examples/postgres-private-ip)
-for instructions.
+![Cloud SQL Architecture](https://github.com/gruntwork-io/terraform-google-sql/blob/master/_docs/cloud-sql.png "Cloud SQL Architecture")
 
-## What's in this repo
+## Features
+
+- Deploy a fully-managed relational database
+- Supports MySQL and PostgreSQL
+- Optional failover instances
+- Optional read replicas
+
+## Learn
+
+This repo is a part of [the Gruntwork Infrastructure as Code Library](https://gruntwork.io/infrastructure-as-code-library/), a collection of reusable, battle-tested, production ready infrastructure code. If you’ve never used the Infrastructure as Code Library before, make sure to read [How to use the Gruntwork Infrastructure as Code Library](https://gruntwork.io/guides/foundations/how-to-use-gruntwork-infrastructure-as-code-library/)!
+
+### Core concepts
+
+- [What is Cloud SQL](https://github.com/gruntwork-io/terraform-google-sql/blob/master/modules/cloud-sql/core-concepts.md#what-is-cloud-sql)
+- [Cloud SQL documentation](https://cloud.google.com/sql/docs/)
+- **[Designing Data Intensive Applications](https://dataintensive.net/)**: the best book we’ve found for understanding data systems, including relational databases, NoSQL, replication, sharding, consistency, and so on.
+
+### Repo organisation
 
 This repo has the following folder structure:
 
-* [root](https://github.com/gruntwork-io/terraform-google-sql/tree/master): The root folder contains an example of how
+- [root](https://github.com/gruntwork-io/terraform-google-sql/tree/master): The root folder contains an example of how
   to deploy a private PostgreSQL instance in Cloud SQL. See [postgres-private-ip](https://github.com/gruntwork-io/terraform-google-sql/blob/master/examples/postgres-private-ip)
   for the documentation.
 
-* [modules](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules): This folder contains the
+- [modules](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules): This folder contains the
   main implementation code for this Module, broken down into multiple standalone submodules.
 
   The primary module is:
 
-    * [cloud-sql](/modules/cloud-sql): Deploy a Cloud SQL [MySQL](https://cloud.google.com/sql/docs/mysql/) or
-    [PostgreSQL](https://cloud.google.com/sql/docs/postgres/) database.
-
-* [examples](https://github.com/gruntwork-io/terraform-google-sql/tree/master/examples): This folder contains
+  - [cloud-sql](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql): Deploy a Cloud SQL [MySQL](https://cloud.google.com/sql/docs/mysql/) or [PostgreSQL](https://cloud.google.com/sql/docs/postgres/) database.
+  
+- [examples](https://github.com/gruntwork-io/terraform-google-sql/tree/master/examples): This folder contains
   examples of how to use the submodules.
 
-* [test](https://github.com/gruntwork-io/terraform-google-sql/tree/master/test): Automated tests for the submodules
+- [test](https://github.com/gruntwork-io/terraform-google-sql/tree/master/test): Automated tests for the submodules
   and examples.
 
-## What is Cloud SQL?
+## Deploy
 
-Cloud SQL is Google's fully-managed database service that makes it easy to set up, maintain, manage, and administer 
-your relational databases on Google Cloud Platform. Cloud SQL automatically includes: 
+### Non-production deployment (quick start for learning)
 
-* Data replication between multiple zones with automatic failover.
-* Automated and on-demand backups, and point-in-time recovery.
-* Data encryption on networks, database tables, temporary files, and backups.
-* Secure external connections with the [Cloud SQL Proxy](https://cloud.google.com/sql/docs/mysql/sql-proxy) or with the SSL/TLS protocol.
+If you just want to try this repo out for experimenting and learning, check out the following resources:
 
-You can learn more about Cloud SQL from [the official documentation](https://cloud.google.com/sql/docs/).
+- [examples folder](https://github.com/gruntwork-io/terraform-google-sql/blob/master/examples): The `examples` folder contains sample code optimized for learning, experimenting, and testing (but not production usage).
 
-## What's a Module?
+### Production deployment
 
-A Module is a canonical, reusable, best-practices definition for how to run a single piece of infrastructure, such
-as a database or server cluster. Each Module is written using a combination of [Terraform](https://www.terraform.io/)
-and scripts (mostly bash) and include automated tests, documentation, and examples. It is maintained both by the open
-source community and companies that provide commercial support.
+If you want to deploy this repo in production, check out the following resources:
 
-Instead of figuring out the details of how to run a piece of infrastructure from scratch, you can reuse
-existing code that has been proven in production. And instead of maintaining all that infrastructure code yourself,
-you can leverage the work of the Module community to pick up infrastructure improvements through
-a version number bump.
+- [cloud-sql module in the GCP Reference Architecture](https://github.com/gruntwork-io/infrastructure-modules-google/tree/master/data-stores/cloud-sql): 
+Production-ready sample code from the GCP Reference Architecture. Note that the repository is private and accessible only with 
+Gruntwork subscription. To get access, [subscribe now](https://www.gruntwork.io/pricing/) or contact us at [support@gruntwork.io](mailto:support@gruntwork.io) for more information.
 
-## Who maintains this Module?
+## Manage
 
-This Module and its Submodules are maintained by [Gruntwork](http://www.gruntwork.io/). Read the [Gruntwork Philosophy](/GRUNTWORK_PHILOSOPHY.md) document to learn more about how Gruntwork builds production grade infrastructure code. If you are looking for help or
-commercial support, send an email to
-[support@gruntwork.io](mailto:support@gruntwork.io?Subject=Google%20SQL%20Module).
+### Day-to-day operations
 
-Gruntwork can help with:
+- [How to connect to a Cloud SQL instance](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql/core-concepts.md#how-do-you-connect-to-the-database)
+- [How to configure high availability](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql/core-concepts.md#how-do-you-configure-high-availability)
+- [How to secure the database instance](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql/core-concepts.md#how-do-you-secure-the-database)
+- [How to scale the database](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql/core-concepts.md#how-do-you-secure-the-database)
 
-* Setup, customization, and support for this Module.
-* Modules and submodules for other types of infrastructure, such as VPCs, Docker clusters, databases, and continuous
-  integration.
-* Modules and Submodules that meet compliance requirements, such as HIPAA.
-* Consulting & Training on GCP, AWS, Terraform, and DevOps.
+## Support
 
+If you need help with this repo or anything else related to infrastructure or DevOps, Gruntwork offers [Commercial Support](https://gruntwork.io/support/) via Slack, email, and phone/video. If you’re already a Gruntwork customer, hop on Slack and ask away! If not, [subscribe now](https://www.gruntwork.io/pricing/). If you’re not sure, feel free to email us at [support@gruntwork.io](mailto:support@gruntwork.io).
 
-## How do I contribute to this Module?
+## Contributions
 
-Contributions are very welcome! Check out the [Contribution Guidelines](/CONTRIBUTING.md) for instructions.
-
-
-## How is this Module versioned?
-
-This Module follows the principles of [Semantic Versioning](http://semver.org/). You can find each new release, along
-with the changelog, in the [Releases Page](../../releases).
-
-During initial development, the major version will be 0 (e.g., `0.x.y`), which indicates the code does not yet have a
-stable API. Once we hit `1.0.0`, we will make every effort to maintain a backwards compatible API and use the MAJOR,
-MINOR, and PATCH versions on each release to indicate any incompatibilities.
+Contributions to this repo are very welcome and appreciated! If you find a bug or want to add a new feature or even contribute an entirely new module, we are very happy to accept pull requests, provide feedback, and run your changes through our automated test suite.
 
+Please see [Contributing to the Gruntwork Infrastructure as Code Library](https://gruntwork.io/guides/foundations/how-to-use-gruntwork-infrastructure-as-code-library/#contributing-to-the-gruntwork-infrastructure-as-code-library) for instructions.
 
 ## License
 
-Please see [LICENSE](/LICENSE) for how the code in this repo is licensed.
+Please see [LICENSE](https://github.com/gruntwork-io/terraform-google-sql/blob/master/LICENSE.txt) for details on how the code in this repo is licensed.
 
 Copyright &copy; 2019 Gruntwork, Inc.
+
+
+
+

examples/client-certificate/README.md

@@ -13,7 +13,7 @@ Creating the certificate while there are other operations ongoing will result in
 To run this example, you need to:
 
 1. Install [Terraform](https://www.terraform.io/).
-1. Open up `vars.tf` and set secrets at the top of the file as environment variables and fill in any other variables in
+1. Open up `variables.tf` and set secrets at the top of the file as environment variables and fill in any other variables in
    the file that don't have defaults. 
 1. `terraform init`.
 1. `terraform plan`.

examples/client-certificate/main.tf

@@ -7,14 +7,15 @@
 # ------------------------------------------------------------------------------
 
 provider "google-beta" {
-  region  = "${var.region}"
-  project = "${var.project}"
+  version = "~> 2.7.0"
+  project = var.project
+  region  = var.region
 }
 
-# Use Terraform 0.10.x so that we can take advantage of Terraform GCP functionality as a separate provider via
-# https://github.com/terraform-providers/terraform-provider-google
 terraform {
-  required_version = ">= 0.10.3"
+  # The modules used in this example have been updated with 0.12 syntax, which means the example is no longer
+  # compatible with any versions below 0.12.
+  required_version = ">= 0.12"
 }
 
 # ------------------------------------------------------------------------------
@@ -22,7 +23,7 @@ terraform {
 # ------------------------------------------------------------------------------
 
 resource "google_sql_ssl_cert" "client_cert" {
-  provider    = "google-beta"
-  common_name = "${var.common_name}"
-  instance    = "${var.database_instance_name}"
+  provider    = google-beta
+  common_name = var.common_name
+  instance    = var.database_instance_name
 }

examples/client-certificate/outputs.tf

@@ -4,11 +4,11 @@
 
 output "client_ca_cert" {
   description = "Certificate data for the client certificate."
-  value       = "${google_sql_ssl_cert.client_cert.cert}"
+  value       = google_sql_ssl_cert.client_cert.cert
 }
 
 # In real-world cases, the output for the private key should always be encrypted
 output "client_private_key" {
   description = "Private key associated with the client certificate."
-  value       = "${google_sql_ssl_cert.client_cert.private_key}"
+  value       = google_sql_ssl_cert.client_cert.private_key
 }

examples/client-certificate/variables.tf

@@ -5,17 +5,21 @@
 
 variable "project" {
   description = "The project ID to host the database in."
+  type        = string
 }
 
 variable "region" {
   description = "The region to host the database in."
+  type        = string
 }
 
 # Note, after a name db instance is used, it cannot be reused for up to one week.
 variable "common_name" {
   description = "The common name to be used in the certificate to identify the client. Constrained to [a-zA-Z.-_ ]+. Changing this forces a new resource to be created."
+  type        = string
 }
 
 variable "database_instance_name" {
   description = "The name of the Cloud SQL instance. Changing this forces a new resource to be created."
+  type        = string
 }

examples/mysql-private-ip/README.md

@@ -1,6 +1,6 @@
 # MySQL Cloud SQL Private IP Example
 
-This folder contains an example of how to use the [Cloud SQL module](/modules/cloud-sql) to create a [Google Cloud SQL](https://cloud.google.com/sql/) 
+This folder contains an example of how to use the [Cloud SQL module](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql) to create a [Google Cloud SQL](https://cloud.google.com/sql/) 
 [MySQL](https://cloud.google.com/sql/docs/mysql/) database instance with a [private IP address](https://cloud.google.com/sql/docs/mysql/private-ip). 
 
 ## How do you run this example?
@@ -18,4 +18,4 @@ When the templates are applied, Terraform will output the IP address of the inst
 and the instance path for [connecting using the Cloud SQL Proxy](https://cloud.google.com/sql/docs/mysql/connect-admin-proxy). 
 
 Note that you cannot connect to the private IP instance from outside Google Cloud Platform. 
-If you want to experiment with connecting from your own workstation, see the [public IP example](../mysql-public-ip)  
+If you want to experiment with connecting from your own workstation, see the [public IP example](https://github.com/gruntwork-io/terraform-google-sql/tree/master/examples/mysql-public-ip)  

examples/mysql-private-ip/main.tf

@@ -7,15 +7,15 @@
 # ------------------------------------------------------------------------------
 
 provider "google-beta" {
-  version = "~> 2.1.0"
-  region  = "${var.region}"
-  project = "${var.project}"
+  version = "~> 2.7.0"
+  project = var.project
+  region  = var.region
 }
 
-# Use Terraform 0.10.x so that we can take advantage of Terraform GCP functionality as a separate provider via
-# https://github.com/terraform-providers/terraform-provider-google
 terraform {
-  required_version = ">= 0.10.3"
+  # The modules used in this example have been updated with 0.12 syntax, which means the example is no longer
+  # compatible with any versions below 0.12.
+  required_version = ">= 0.12"
 }
 
 # ------------------------------------------------------------------------------
@@ -28,7 +28,7 @@ resource "random_id" "name" {
 
 locals {
   # If name_override is specified, use that - otherwise use the name_prefix with a random string
-  instance_name        = "${length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override}"
+  instance_name        = var.name_override == null ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override
   private_network_name = "private-network-${random_id.name.hex}"
   private_ip_name      = "private-ip-${random_id.name.hex}"
 }
@@ -39,26 +39,26 @@ locals {
 
 # Simple network, auto-creates subnetworks
 resource "google_compute_network" "private_network" {
-  provider = "google-beta"
-  name     = "${local.private_network_name}"
+  provider = google-beta
+  name     = local.private_network_name
 }
 
 # Reserve global internal address range for the peering
 resource "google_compute_global_address" "private_ip_address" {
-  provider      = "google-beta"
-  name          = "${local.private_ip_name}"
+  provider      = google-beta
+  name          = local.private_ip_name
   purpose       = "VPC_PEERING"
   address_type  = "INTERNAL"
   prefix_length = 16
-  network       = "${google_compute_network.private_network.self_link}"
+  network       = google_compute_network.private_network.self_link
 }
 
 # Establish VPC network peering connection using the reserved address range
 resource "google_service_networking_connection" "private_vpc_connection" {
-  provider                = "google-beta"
-  network                 = "${google_compute_network.private_network.self_link}"
+  provider                = google-beta
+  network                 = google_compute_network.private_network.self_link
   service                 = "servicenetworking.googleapis.com"
-  reserved_peering_ranges = ["${google_compute_global_address.private_ip_address.name}"]
+  reserved_peering_ranges = [google_compute_global_address.private_ip_address.name]
 }
 
 # ------------------------------------------------------------------------------
@@ -68,31 +68,31 @@ resource "google_service_networking_connection" "private_vpc_connection" {
 module "mysql" {
   # When using these modules in your own templates, you will need to use a Git URL with a ref attribute that pins you
   # to a specific version of the modules, such as the following example:
-  # source = "git::git@github.com:gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.1.0"
+  # source = "github.com/gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.2.0"
   source = "../../modules/cloud-sql"
 
-  project = "${var.project}"
-  region  = "${var.region}"
-  name    = "${local.instance_name}"
-  db_name = "${var.db_name}"
+  project = var.project
+  region  = var.region
+  name    = local.instance_name
+  db_name = var.db_name
 
-  engine       = "${var.mysql_version}"
-  machine_type = "${var.machine_type}"
+  engine       = var.mysql_version
+  machine_type = var.machine_type
 
   # These together will construct the master_user privileges, i.e.
   # 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'.
   # These should typically be set as the environment variable TF_VAR_master_user_password, etc.
   # so you don't check these into source control."
-  master_user_password = "${var.master_user_password}"
+  master_user_password = var.master_user_password
 
-  master_user_name = "${var.master_user_name}"
+  master_user_name = var.master_user_name
   master_user_host = "%"
 
   # Pass the private network link to the module
-  private_network = "${google_compute_network.private_network.self_link}"
+  private_network = google_compute_network.private_network.self_link
 
   # Wait for the vpc connection to complete
-  dependencies = ["${google_service_networking_connection.private_vpc_connection.network}"]
+  dependencies = [google_service_networking_connection.private_vpc_connection.network]
 
   # Set auto-increment flags to test the
   # feature during automated testing

examples/mysql-private-ip/outputs.tf

@@ -4,27 +4,27 @@
 
 output "master_instance_name" {
   description = "The name of the database instance"
-  value       = "${module.mysql.master_instance_name}"
+  value       = module.mysql.master_instance_name
 }
 
 output "master_ip_addresses" {
   description = "All IP addresses of the instance as list of maps, see https://www.terraform.io/docs/providers/google/r/sql_database_instance.html#ip_address-0-ip_address"
-  value       = "${module.mysql.master_ip_addresses}"
+  value       = module.mysql.master_ip_addresses
 }
 
 output "master_private_ip" {
   description = "The private IPv4 address of the master instance."
-  value       = "${module.mysql.master_private_ip_address}"
+  value       = module.mysql.master_private_ip_address
 }
 
 output "master_instance" {
   description = "Self link to the master instance"
-  value       = "${module.mysql.master_instance}"
+  value       = module.mysql.master_instance
 }
 
 output "master_proxy_connection" {
   description = "Instance path for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = "${module.mysql.master_proxy_connection}"
+  value       = module.mysql.master_proxy_connection
 }
 
 # ------------------------------------------------------------------------------
@@ -33,10 +33,10 @@ output "master_proxy_connection" {
 
 output "db_name" {
   description = "Name of the default database"
-  value       = "${module.mysql.db_name}"
+  value       = module.mysql.db_name
 }
 
 output "db" {
   description = "Self link to the default database"
-  value       = "${module.mysql.db}"
+  value       = module.mysql.db
 }

examples/mysql-private-ip/variables.tf

@@ -5,45 +5,55 @@
 
 variable "project" {
   description = "The project ID to host the database in."
+  type        = string
 }
 
 variable "region" {
   description = "The region to host the database in."
+  type        = string
 }
 
 # Note, after a name db instance is used, it cannot be reused for up to one week.
 variable "name_prefix" {
   description = "The name prefix for the database instance. Will be appended with a random string. Use lowercase letters, numbers, and hyphens. Start with a letter."
+  type        = string
 }
 
 variable "master_user_name" {
   description = "The username part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_name so you don't check it into source control."
+  type        = string
 }
 
 variable "master_user_password" {
   description = "The password part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_password so you don't check it into source control."
+  type        = string
 }
 
 # ---------------------------------------------------------------------------------------------------------------------
 # OPTIONAL PARAMETERS
 # Generally, these values won't need to be changed.
 # ---------------------------------------------------------------------------------------------------------------------
+
 variable "mysql_version" {
   description = "The engine version of the database, e.g. `MYSQL_5_6` or `MYSQL_5_7`. See https://cloud.google.com/sql/docs/features for supported versions."
+  type        = string
   default     = "MYSQL_5_7"
 }
 
 variable "machine_type" {
   description = "The machine type to use, see https://cloud.google.com/sql/pricing for more details"
+  type        = string
   default     = "db-f1-micro"
 }
 
 variable "db_name" {
   description = "Name for the db"
+  type        = string
   default     = "default"
 }
 
 variable "name_override" {
   description = "You may optionally override the name_prefix + random string by specifying an override"
-  default     = ""
+  type        = string
+  default     = null
 }

examples/mysql-public-ip/README.md

@@ -1,6 +1,6 @@
 # MySQL Cloud SQL Public IP Example
 
-This folder contains an example of how to use the [Cloud SQL module](/modules/cloud-sql) to create a [Google Cloud SQL](https://cloud.google.com/sql/) 
+This folder contains an example of how to use the [Cloud SQL module](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql) to create a [Google Cloud SQL](https://cloud.google.com/sql/) 
 [MySQL](https://cloud.google.com/sql/docs/mysql/) database instance with a [public IP address](https://cloud.google.com/sql/docs/mysql/connect-external-app#appaccessIP). 
 
 ## How do you run this example?

examples/mysql-public-ip/main.tf

@@ -7,15 +7,15 @@
 # ------------------------------------------------------------------------------
 
 provider "google-beta" {
-  version = "~> 2.1.0"
-  region  = "${var.region}"
-  project = "${var.project}"
+  version = "~> 2.7.0"
+  project = var.project
+  region  = var.region
 }
 
-# Use Terraform 0.10.x so that we can take advantage of Terraform GCP functionality as a separate provider via
-# https://github.com/terraform-providers/terraform-provider-google
 terraform {
-  required_version = ">= 0.10.3"
+  # The modules used in this example have been updated with 0.12 syntax, which means the example is no longer
+  # compatible with any versions below 0.12.
+  required_version = ">= 0.12"
 }
 
 # ------------------------------------------------------------------------------
@@ -28,7 +28,7 @@ resource "random_id" "name" {
 
 locals {
   # If name_override is specified, use that - otherwise use the name_prefix with a random string
-  instance_name = "${length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override}"
+  instance_name = var.name_override == null ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override
 }
 
 # ------------------------------------------------------------------------------
@@ -38,24 +38,24 @@ locals {
 module "mysql" {
   # When using these modules in your own templates, you will need to use a Git URL with a ref attribute that pins you
   # to a specific version of the modules, such as the following example:
-  # source = "git::git@github.com:gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.1.0"
+  # source = "github.com/gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.2.0"
   source = "../../modules/cloud-sql"
 
-  project = "${var.project}"
-  region  = "${var.region}"
-  name    = "${local.instance_name}"
-  db_name = "${var.db_name}"
+  project = var.project
+  region  = var.region
+  name    = local.instance_name
+  db_name = var.db_name
 
-  engine       = "${var.mysql_version}"
-  machine_type = "${var.machine_type}"
+  engine       = var.mysql_version
+  machine_type = var.machine_type
 
   # These together will construct the master_user privileges, i.e.
   # 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'.
   # These should typically be set as the environment variable TF_VAR_master_user_password, etc.
   # so you don't check these into source control."
-  master_user_password = "${var.master_user_password}"
+  master_user_password = var.master_user_password
 
-  master_user_name = "${var.master_user_name}"
+  master_user_name = var.master_user_name
   master_user_host = "%"
 
   # To make it easier to test this example, we are giving the servers public IP addresses and allowing inbound
@@ -65,7 +65,7 @@ module "mysql" {
 
   # Default setting for this is 'false' in 'variables.tf'
   # In the test cases, we're setting this to true, to test forced SSL.
-  require_ssl = "${var.require_ssl}"
+  require_ssl = var.require_ssl
 
   authorized_networks = [
     {

examples/mysql-public-ip/outputs.tf

@@ -4,27 +4,27 @@
 
 output "master_instance_name" {
   description = "The name of the database instance"
-  value       = "${module.mysql.master_instance_name}"
+  value       = module.mysql.master_instance_name
 }
 
 output "master_public_ip" {
   description = "The public IPv4 address of the master instance."
-  value       = "${module.mysql.master_public_ip_address}"
+  value       = module.mysql.master_public_ip_address
 }
 
 output "master_ca_cert" {
-  value       = "${module.mysql.master_ca_cert}"
+  value       = module.mysql.master_ca_cert
   description = "The CA Certificate used to connect to the SQL Instance via SSL"
 }
 
 output "master_instance" {
   description = "Self link to the master instance"
-  value       = "${module.mysql.master_instance}"
+  value       = module.mysql.master_instance
 }
 
 output "master_proxy_connection" {
   description = "Instance path for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = "${module.mysql.master_proxy_connection}"
+  value       = module.mysql.master_proxy_connection
 }
 
 # ------------------------------------------------------------------------------
@@ -33,10 +33,10 @@ output "master_proxy_connection" {
 
 output "db_name" {
   description = "Name of the default database"
-  value       = "${module.mysql.db_name}"
+  value       = module.mysql.db_name
 }
 
 output "db" {
   description = "Self link to the default database"
-  value       = "${module.mysql.db}"
+  value       = module.mysql.db
 }

examples/mysql-public-ip/variables.tf

@@ -5,52 +5,63 @@
 
 variable "project" {
   description = "The project ID to host the database in."
+  type        = string
 }
 
 variable "region" {
   description = "The region to host the database in."
+  type        = string
 }
 
 # Note, after a name db instance is used, it cannot be reused for up to one week.
 variable "name_prefix" {
   description = "The name prefix for the database instance. Will be appended with a random string. Use lowercase letters, numbers, and hyphens. Start with a letter."
+  type        = string
 }
 
 variable "master_user_name" {
   description = "The username part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_name so you don't check it into source control."
+  type        = string
 }
 
 variable "master_user_password" {
   description = "The password part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_password so you don't check it into source control."
+  type        = string
 }
 
 # ---------------------------------------------------------------------------------------------------------------------
 # OPTIONAL PARAMETERS
 # Generally, these values won't need to be changed.
 # ---------------------------------------------------------------------------------------------------------------------
+
 variable "mysql_version" {
   description = "The engine version of the database, e.g. `MYSQL_5_6` or `MYSQL_5_7`. See https://cloud.google.com/sql/docs/features for supported versions."
+  type        = string
   default     = "MYSQL_5_7"
 }
 
 variable "machine_type" {
   description = "The machine type to use, see https://cloud.google.com/sql/pricing for more details"
+  type        = string
   default     = "db-f1-micro"
 }
 
 variable "db_name" {
   description = "Name for the db"
+  type        = string
   default     = "default"
 }
 
 variable "name_override" {
   description = "You may optionally override the name_prefix + random string by specifying an override"
-  default     = ""
+  type        = string
+  default     = null
 }
 
 # When configuring a public IP instance, you should only allow secure connections
 # For testing purposes, we're initially allowing unsecured connections.
 variable "require_ssl" {
   description = "True if the instance should require SSL/TLS for users connecting over IP. Note: SSL/TLS is needed to provide security when you connect to Cloud SQL using IP addresses. If you are connecting to your instance only by using the Cloud SQL Proxy or the Java Socket Library, you do not need to configure your instance to use SSL/TLS."
+  type        = bool
   default     = false
 }

examples/mysql-replicas/README.md

@@ -1,6 +1,10 @@
 # MySQL Cloud SQL HA Example
 
-This folder contains an example of how to use the [Cloud SQL module](/modules/cloud-sql) to create a [High Availability](https://cloud.google.com/sql/docs/mysql/configure-ha) [Google Cloud SQL](https://cloud.google.com/sql/) 
+<!-- NOTE: We use absolute linking here instead of relative linking, because the terraform registry does not support
+           relative linking correctly.
+-->
+
+This folder contains an example of how to use the [Cloud SQL module](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql) to create a [High Availability](https://cloud.google.com/sql/docs/mysql/configure-ha) [Google Cloud SQL](https://cloud.google.com/sql/) 
 [MySQL](https://cloud.google.com/sql/docs/mysql/) database cluster with a [public IP](https://cloud.google.com/sql/docs/mysql/connect-external-app#appaccessIP) and failover and [read replicas](https://cloud.google.com/sql/docs/mysql/replication/). 
 
 ## How do you run this example?

examples/mysql-replicas/main.tf

@@ -7,15 +7,15 @@
 # ------------------------------------------------------------------------------
 
 provider "google-beta" {
-  version = "~> 2.1.0"
-  region  = "${var.region}"
-  project = "${var.project}"
+  version = "~> 2.7.0"
+  project = var.project
+  region  = var.region
 }
 
-# Use Terraform 0.10.x so that we can take advantage of Terraform GCP functionality as a separate provider via
-# https://github.com/terraform-providers/terraform-provider-google
 terraform {
-  required_version = ">= 0.10.3"
+  # The modules used in this example have been updated with 0.12 syntax, which means the example is no longer
+  # compatible with any versions below 0.12.
+  required_version = ">= 0.12"
 }
 
 # ------------------------------------------------------------------------------
@@ -28,7 +28,7 @@ resource "random_id" "name" {
 
 locals {
   # If name_override is specified, use that - otherwise use the name_prefix with a random string
-  instance_name        = "${length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override}"
+  instance_name        = var.name_override == null ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override
   private_network_name = "private-network-${random_id.name.hex}"
   private_ip_name      = "private-ip-${random_id.name.hex}"
 }
@@ -40,18 +40,18 @@ locals {
 module "mysql" {
   # When using these modules in your own templates, you will need to use a Git URL with a ref attribute that pins you
   # to a specific version of the modules, such as the following example:
-  # source = "git::git@github.com:gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.1.0"
+  # source = "github.com/gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.2.0"
   source = "../../modules/cloud-sql"
 
-  project = "${var.project}"
-  region  = "${var.region}"
-  name    = "${local.instance_name}"
-  db_name = "${var.db_name}"
+  project = var.project
+  region  = var.region
+  name    = local.instance_name
+  db_name = var.db_name
 
-  engine       = "${var.mysql_version}"
-  machine_type = "${var.machine_type}"
+  engine       = var.mysql_version
+  machine_type = var.machine_type
 
-  master_zone = "${var.master_zone}"
+  master_zone = var.master_zone
 
   # To make it easier to test this example, we are giving the servers public IP addresses and allowing inbound
   # connections from anywhere. In real-world usage, your servers should live in private subnets, only have private IP
@@ -67,19 +67,19 @@ module "mysql" {
 
   # Indicate that we want to create a failover replica
   enable_failover_replica     = true
-  mysql_failover_replica_zone = "${var.failover_replica_zone}"
+  mysql_failover_replica_zone = var.failover_replica_zone
 
   # Indicate we want read replicas to be created
-  num_read_replicas  = "${var.num_read_replicas}"
-  read_replica_zones = ["${var.read_replica_zones}"]
+  num_read_replicas  = var.num_read_replicas
+  read_replica_zones = var.read_replica_zones
 
   # These together will construct the master_user privileges, i.e.
   # 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'.
   # These should typically be set as the environment variable TF_VAR_master_user_password, etc.
   # so you don't check these into source control."
-  master_user_password = "${var.master_user_password}"
+  master_user_password = var.master_user_password
 
-  master_user_name = "${var.master_user_name}"
+  master_user_name = var.master_user_name
   master_user_host = "%"
 
   # Set auto-increment flags to test the

examples/mysql-replicas/outputs.tf

@@ -4,22 +4,22 @@
 
 output "master_instance_name" {
   description = "The name of the database instance"
-  value       = "${module.mysql.master_instance_name}"
+  value       = module.mysql.master_instance_name
 }
 
 output "master_public_ip" {
   description = "The public IPv4 address of the master instance."
-  value       = "${module.mysql.master_public_ip_address}"
+  value       = module.mysql.master_public_ip_address
 }
 
 output "master_instance" {
   description = "Self link to the master instance"
-  value       = "${module.mysql.master_instance}"
+  value       = module.mysql.master_instance
 }
 
 output "master_proxy_connection" {
   description = "Instance path for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = "${module.mysql.master_proxy_connection}"
+  value       = module.mysql.master_proxy_connection
 }
 
 # ------------------------------------------------------------------------------
@@ -28,12 +28,12 @@ output "master_proxy_connection" {
 
 output "db_name" {
   description = "Name of the default database"
-  value       = "${module.mysql.db_name}"
+  value       = module.mysql.db_name
 }
 
 output "db" {
   description = "Self link to the default database"
-  value       = "${module.mysql.db}"
+  value       = module.mysql.db
 }
 
 # ------------------------------------------------------------------------------
@@ -42,22 +42,22 @@ output "db" {
 
 output "failover_instance" {
   description = "Self link to the failover instance"
-  value       = "${module.mysql.failover_instance}"
+  value       = module.mysql.failover_instance
 }
 
 output "failover_instance_name" {
   description = "The name of the failover database instance"
-  value       = "${module.mysql.failover_instance_name}"
+  value       = module.mysql.failover_instance_name
 }
 
 output "failover_public_ip" {
   description = "The public IPv4 address of the failover instance"
-  value       = "${module.mysql.failover_public_ip_address}"
+  value       = module.mysql.failover_public_ip_address
 }
 
 output "failover_proxy_connection" {
   description = "Failover instance path for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = "${module.mysql.failover_proxy_connection}"
+  value       = module.mysql.failover_proxy_connection
 }
 
 # ------------------------------------------------------------------------------
@@ -66,22 +66,22 @@ output "failover_proxy_connection" {
 
 output "read_replica_instance_names" {
   description = "List of names for the read replica instances"
-  value       = ["${module.mysql.read_replica_instance_names}"]
+  value       = module.mysql.read_replica_instance_names
 }
 
 output "read_replica_public_ips" {
   description = "List of public IPv4 addresses of the read replica instances"
-  value       = ["${module.mysql.read_replica_public_ip_addresses}"]
+  value       = module.mysql.read_replica_public_ip_addresses
 }
 
 output "read_replica_instances" {
   description = "List of self links to the read replica instances"
-  value       = ["${module.mysql.read_replica_instances}"]
+  value       = module.mysql.read_replica_instances
 }
 
 output "read_replica_proxy_connections" {
   description = "List of read replica instance paths for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = ["${module.mysql.read_replica_proxy_connections}"]
+  value       = module.mysql.read_replica_proxy_connections
 }
 
 # Although we don't use the values, this output highlights the JSON encoded output we use in certain
@@ -89,5 +89,5 @@ output "read_replica_proxy_connections" {
 # See https://github.com/hashicorp/terraform/issues/17048
 output "read_replica_server_ca_certs" {
   description = "JSON encoded list of CA Certificates used to connect to the read replica instances via SSL"
-  value       = "${module.mysql.read_replica_server_ca_certs}"
+  value       = module.mysql.read_replica_server_ca_certs
 }

examples/mysql-replicas/variables.tf

@@ -5,27 +5,32 @@
 
 variable "project" {
   description = "The project ID to host the database in."
+  type        = string
 }
 
 variable "region" {
   description = "The region to host the database in (e.g. 'us-central1')."
+  type        = string
 }
 
 variable "master_zone" {
   description = "The preferred zone for the master instance (e.g. 'us-central1-a'). Must be different than 'failover_replica_zone'."
+  type        = string
 }
 
 variable "failover_replica_zone" {
   description = "The preferred zone for the failover instance (e.g. 'us-central1-b'). Must be different than 'master_zone'."
+  type        = string
 }
 
 variable "num_read_replicas" {
   description = "The number of read replicas to create. Cloud SQL will replicate all data from the master to these replicas, which you can use to horizontally scale read traffic."
+  type        = number
 }
 
 variable "read_replica_zones" {
   description = "A list of compute zones where read replicas should be created. List size should match 'num_read_replicas'"
-  type        = "list"
+  type        = list(string)
 
   # Example:
   #  default = ["us-central1-b", "us-central1-c"]
@@ -34,36 +39,44 @@ variable "read_replica_zones" {
 # Note, after a name db instance is used, it cannot be reused for up to one week.
 variable "name_prefix" {
   description = "The name prefix for the database instance. Will be appended with a random string. Use lowercase letters, numbers, and hyphens. Start with a letter."
+  type        = string
 }
 
 variable "master_user_name" {
   description = "The username part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_name so you don't check it into source control."
+  type        = string
 }
 
 variable "master_user_password" {
   description = "The password part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_password so you don't check it into source control."
+  type        = string
 }
 
 # ---------------------------------------------------------------------------------------------------------------------
 # OPTIONAL PARAMETERS
 # Generally, these values won't need to be changed.
 # ---------------------------------------------------------------------------------------------------------------------
+
 variable "mysql_version" {
   description = "The engine version of the database, e.g. `MYSQL_5_6` or `MYSQL_5_7`. See https://cloud.google.com/sql/docs/features for supported versions."
+  type        = string
   default     = "MYSQL_5_7"
 }
 
 variable "machine_type" {
   description = "The machine type to use, see https://cloud.google.com/sql/pricing for more details"
+  type        = string
   default     = "db-f1-micro"
 }
 
 variable "db_name" {
   description = "Name for the db"
+  type        = string
   default     = "default"
 }
 
 variable "name_override" {
   description = "You may optionally override the name_prefix + random string by specifying an override"
-  default     = ""
+  type        = string
+  default     = null
 }

examples/postgres-private-ip/README.md

@@ -1,6 +1,10 @@
 # PostgreSQL Cloud SQL Private IP Example
 
-This folder contains an example of how to use the [Cloud SQL module](/modules/cloud-sql) to create a [Google Cloud SQL](https://cloud.google.com/sql/) 
+<!-- NOTE: We use absolute linking here instead of relative linking, because the terraform registry does not support
+           relative linking correctly.
+-->
+
+This folder contains an example of how to use the [Cloud SQL module](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql) to create a [Google Cloud SQL](https://cloud.google.com/sql/) 
 [PostgreSQL](https://cloud.google.com/sql/docs/postgres/) database instance with a [private IP address](https://cloud.google.com/sql/docs/postgres/private-ip). 
 
 ## How do you run this example?
@@ -18,4 +22,4 @@ When the templates are applied, Terraform will output the IP address of the inst
 and the instance path for [connecting using the Cloud SQL Proxy](https://cloud.google.com/sql/docs/postgres/sql-proxy).
 
 Note that you cannot connect to the private IP instance from outside Google Cloud Platform. 
-If you want to experiment with connecting from your own workstation, see the [public IP example](../postgres-public-ip)  
+If you want to experiment with connecting from your own workstation, see the [public IP example](https://github.com/gruntwork-io/terraform-google-sql/tree/master/examples/postgres-public-ip)  

examples/postgres-private-ip/main.tf

@@ -7,15 +7,15 @@
 # ------------------------------------------------------------------------------
 
 provider "google-beta" {
-  version = "~> 2.1.0"
-  region  = "${var.region}"
-  project = "${var.project}"
+  version = "~> 2.7.0"
+  project = var.project
+  region  = var.region
 }
 
-# Use Terraform 0.10.x so that we can take advantage of Terraform GCP functionality as a separate provider via
-# https://github.com/terraform-providers/terraform-provider-google
 terraform {
-  required_version = ">= 0.10.3"
+  # The modules used in this example have been updated with 0.12 syntax, which means the example is no longer
+  # compatible with any versions below 0.12.
+  required_version = ">= 0.12"
 }
 
 # ------------------------------------------------------------------------------
@@ -28,7 +28,7 @@ resource "random_id" "name" {
 
 locals {
   # If name_override is specified, use that - otherwise use the name_prefix with a random string
-  instance_name        = "${length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override}"
+  instance_name        = var.name_override == null ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override
   private_network_name = "private-network-${random_id.name.hex}"
   private_ip_name      = "private-ip-${random_id.name.hex}"
 }
@@ -39,26 +39,26 @@ locals {
 
 # Simple network, auto-creates subnetworks
 resource "google_compute_network" "private_network" {
-  provider = "google-beta"
-  name     = "${local.private_network_name}"
+  provider = google-beta
+  name     = local.private_network_name
 }
 
 # Reserve global internal address range for the peering
 resource "google_compute_global_address" "private_ip_address" {
-  provider      = "google-beta"
-  name          = "${local.private_ip_name}"
+  provider      = google-beta
+  name          = local.private_ip_name
   purpose       = "VPC_PEERING"
   address_type  = "INTERNAL"
   prefix_length = 16
-  network       = "${google_compute_network.private_network.self_link}"
+  network       = google_compute_network.private_network.self_link
 }
 
 # Establish VPC network peering connection using the reserved address range
 resource "google_service_networking_connection" "private_vpc_connection" {
-  provider                = "google-beta"
-  network                 = "${google_compute_network.private_network.self_link}"
+  provider                = google-beta
+  network                 = google_compute_network.private_network.self_link
   service                 = "servicenetworking.googleapis.com"
-  reserved_peering_ranges = ["${google_compute_global_address.private_ip_address.name}"]
+  reserved_peering_ranges = [google_compute_global_address.private_ip_address.name]
 }
 
 # ------------------------------------------------------------------------------
@@ -68,31 +68,31 @@ resource "google_service_networking_connection" "private_vpc_connection" {
 module "postgres" {
   # When using these modules in your own templates, you will need to use a Git URL with a ref attribute that pins you
   # to a specific version of the modules, such as the following example:
-  # source = "git::git@github.com:gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.1.0"
+  # source = "github.com/gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.2.0"
   source = "../../modules/cloud-sql"
 
-  project = "${var.project}"
-  region  = "${var.region}"
-  name    = "${local.instance_name}"
-  db_name = "${var.db_name}"
+  project = var.project
+  region  = var.region
+  name    = local.instance_name
+  db_name = var.db_name
 
-  engine       = "${var.postgres_version}"
-  machine_type = "${var.machine_type}"
+  engine       = var.postgres_version
+  machine_type = var.machine_type
 
   # These together will construct the master_user privileges, i.e.
   # 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'.
   # These should typically be set as the environment variable TF_VAR_master_user_password, etc.
   # so you don't check these into source control."
-  master_user_password = "${var.master_user_password}"
+  master_user_password = var.master_user_password
 
-  master_user_name = "${var.master_user_name}"
+  master_user_name = var.master_user_name
   master_user_host = "%"
 
   # Pass the private network link to the module
-  private_network = "${google_compute_network.private_network.self_link}"
+  private_network = google_compute_network.private_network.self_link
 
   # Wait for the vpc connection to complete
-  dependencies = ["${google_service_networking_connection.private_vpc_connection.network}"]
+  dependencies = [google_service_networking_connection.private_vpc_connection.network]
 
   custom_labels = {
     test-id = "postgres-private-ip-example"

examples/postgres-private-ip/outputs.tf

@@ -4,27 +4,27 @@
 
 output "master_instance_name" {
   description = "The name of the database instance"
-  value       = "${module.postgres.master_instance_name}"
+  value       = module.postgres.master_instance_name
 }
 
 output "master_ip_addresses" {
   description = "All IP addresses of the instance as list of maps, see https://www.terraform.io/docs/providers/google/r/sql_database_instance.html#ip_address-0-ip_address"
-  value       = "${module.postgres.master_ip_addresses}"
+  value       = module.postgres.master_ip_addresses
 }
 
 output "master_private_ip" {
   description = "The private IPv4 address of the master instance"
-  value       = "${module.postgres.master_private_ip_address}"
+  value       = module.postgres.master_private_ip_address
 }
 
 output "master_instance" {
   description = "Self link to the master instance"
-  value       = "${module.postgres.master_instance}"
+  value       = module.postgres.master_instance
 }
 
 output "master_proxy_connection" {
   description = "Instance path for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = "${module.postgres.master_proxy_connection}"
+  value       = module.postgres.master_proxy_connection
 }
 
 # ------------------------------------------------------------------------------
@@ -33,10 +33,10 @@ output "master_proxy_connection" {
 
 output "db_name" {
   description = "Name of the default database"
-  value       = "${module.postgres.db_name}"
+  value       = module.postgres.db_name
 }
 
 output "db" {
   description = "Self link to the default database"
-  value       = "${module.postgres.db}"
+  value       = module.postgres.db
 }

examples/postgres-private-ip/variables.tf

@@ -5,45 +5,55 @@
 
 variable "project" {
   description = "The project ID to host the database in."
+  type        = string
 }
 
 variable "region" {
   description = "The region to host the database in."
+  type        = string
 }
 
 # Note, after a name db instance is used, it cannot be reused for up to one week.
 variable "name_prefix" {
   description = "The name prefix for the database instance. Will be appended with a random string. Use lowercase letters, numbers, and hyphens. Start with a letter."
+  type        = string
 }
 
 variable "master_user_name" {
   description = "The username part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_name so you don't check it into source control."
+  type        = string
 }
 
 variable "master_user_password" {
   description = "The password part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_password so you don't check it into source control."
+  type        = string
 }
 
 # ---------------------------------------------------------------------------------------------------------------------
 # OPTIONAL PARAMETERS
 # Generally, these values won't need to be changed.
 # ---------------------------------------------------------------------------------------------------------------------
+
 variable "postgres_version" {
   description = "The engine version of the database, e.g. `POSTGRES_9_6`. See https://cloud.google.com/sql/docs/db-versions for supported versions."
+  type        = string
   default     = "POSTGRES_9_6"
 }
 
 variable "machine_type" {
   description = "The machine type to use, see https://cloud.google.com/sql/pricing for more details"
+  type        = string
   default     = "db-f1-micro"
 }
 
 variable "db_name" {
   description = "Name for the db"
+  type        = string
   default     = "default"
 }
 
 variable "name_override" {
   description = "You may optionally override the name_prefix + random string by specifying an override"
-  default     = ""
+  type        = string
+  default     = null
 }

examples/postgres-public-ip/README.md

@@ -1,6 +1,10 @@
 # PostgreSQL Cloud SQL Public IP Example
 
-This folder contains an example of how to use the [Cloud SQL module](/modules/cloud-sql) to create a [Google Cloud SQL](https://cloud.google.com/sql/) 
+<!-- NOTE: We use absolute linking here instead of relative linking, because the terraform registry does not support
+           relative linking correctly.
+-->
+
+This folder contains an example of how to use the [Cloud SQL module](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql) to create a [Google Cloud SQL](https://cloud.google.com/sql/) 
 [PostgreSQL](https://cloud.google.com/sql/docs/postgres/) database instance with a [public IP address](https://cloud.google.com/sql/docs/postgres/connect-external-app#appaccessIP). 
 
 ## How do you run this example?

examples/postgres-public-ip/main.tf

@@ -7,15 +7,15 @@
 # ------------------------------------------------------------------------------
 
 provider "google-beta" {
-  version = "~> 2.1.0"
-  region  = "${var.region}"
-  project = "${var.project}"
+  version = "~> 2.7.0"
+  project = var.project
+  region  = var.region
 }
 
-# Use Terraform 0.10.x so that we can take advantage of Terraform GCP functionality as a separate provider via
-# https://github.com/terraform-providers/terraform-provider-google
 terraform {
-  required_version = ">= 0.10.3"
+  # The modules used in this example have been updated with 0.12 syntax, which means the example is no longer
+  # compatible with any versions below 0.12.
+  required_version = ">= 0.12"
 }
 
 # ------------------------------------------------------------------------------
@@ -28,7 +28,7 @@ resource "random_id" "name" {
 
 locals {
   # If name_override is specified, use that - otherwise use the name_prefix with a random string
-  instance_name = "${length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override}"
+  instance_name = var.name_override == null ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override
 }
 
 # ------------------------------------------------------------------------------
@@ -38,25 +38,23 @@ locals {
 module "postgres" {
   # When using these modules in your own templates, you will need to use a Git URL with a ref attribute that pins you
   # to a specific version of the modules, such as the following example:
-  # source = "git::git@github.com:gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.1.0"
+  # source = "github.com/gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.2.0"
   source = "../../modules/cloud-sql"
 
-  project = "${var.project}"
-  region  = "${var.region}"
-  name    = "${local.instance_name}"
-  db_name = "${var.db_name}"
+  project = var.project
+  region  = var.region
+  name    = local.instance_name
+  db_name = var.db_name
 
-  engine       = "${var.postgres_version}"
-  machine_type = "${var.machine_type}"
+  engine       = var.postgres_version
+  machine_type = var.machine_type
 
   # These together will construct the master_user privileges, i.e.
-  # 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'.
+  # 'master_user_name' IDENTIFIED BY 'master_user_password'.
   # These should typically be set as the environment variable TF_VAR_master_user_password, etc.
   # so you don't check these into source control."
-  master_user_password = "${var.master_user_password}"
-
-  master_user_name = "${var.master_user_name}"
-  master_user_host = "%"
+  master_user_password = var.master_user_password
+  master_user_name     = var.master_user_name
 
   # To make it easier to test this example, we are giving the servers public IP addresses and allowing inbound
   # connections from anywhere. In real-world usage, your servers should live in private subnets, only have private IP
@@ -65,7 +63,7 @@ module "postgres" {
 
   # Default setting for this is 'false' in 'variables.tf'
   # In the test cases, we're setting this to true, to test forced SSL.
-  require_ssl = "${var.require_ssl}"
+  require_ssl = var.require_ssl
 
   authorized_networks = [
     {

examples/postgres-public-ip/outputs.tf

@@ -4,27 +4,27 @@
 
 output "master_instance_name" {
   description = "The name of the database instance"
-  value       = "${module.postgres.master_instance_name}"
+  value       = module.postgres.master_instance_name
 }
 
 output "master_public_ip" {
   description = "The public IPv4 address of the master instance"
-  value       = "${module.postgres.master_public_ip_address}"
+  value       = module.postgres.master_public_ip_address
 }
 
 output "master_ca_cert" {
   description = "The CA Certificate used to connect to the SQL Instance via SSL"
-  value       = "${module.postgres.master_ca_cert}"
+  value       = module.postgres.master_ca_cert
 }
 
 output "master_instance" {
   description = "Self link to the master instance"
-  value       = "${module.postgres.master_instance}"
+  value       = module.postgres.master_instance
 }
 
 output "master_proxy_connection" {
   description = "Instance path for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = "${module.postgres.master_proxy_connection}"
+  value       = module.postgres.master_proxy_connection
 }
 
 # ------------------------------------------------------------------------------
@@ -33,10 +33,10 @@ output "master_proxy_connection" {
 
 output "db_name" {
   description = "Name of the default database"
-  value       = "${module.postgres.db_name}"
+  value       = module.postgres.db_name
 }
 
 output "db" {
   description = "Self link to the default database"
-  value       = "${module.postgres.db}"
+  value       = module.postgres.db
 }

examples/postgres-public-ip/variables.tf

@@ -5,52 +5,63 @@
 
 variable "project" {
   description = "The project ID to host the database in."
+  type        = string
 }
 
 variable "region" {
   description = "The region to host the database in."
+  type        = string
 }
 
 # Note, after a name db instance is used, it cannot be reused for up to one week.
 variable "name_prefix" {
   description = "The name prefix for the database instance. Will be appended with a random string. Use lowercase letters, numbers, and hyphens. Start with a letter."
+  type        = string
 }
 
 variable "master_user_name" {
   description = "The username part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_name so you don't check it into source control."
+  type        = string
 }
 
 variable "master_user_password" {
   description = "The password part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_password so you don't check it into source control."
+  type        = string
 }
 
 # ---------------------------------------------------------------------------------------------------------------------
 # OPTIONAL PARAMETERS
 # Generally, these values won't need to be changed.
 # ---------------------------------------------------------------------------------------------------------------------
+
 variable "postgres_version" {
   description = "The engine version of the database, e.g. `POSTGRES_9_6`. See https://cloud.google.com/sql/docs/features for supported versions."
+  type        = string
   default     = "POSTGRES_9_6"
 }
 
 variable "machine_type" {
   description = "The machine type to use, see https://cloud.google.com/sql/pricing for more details"
+  type        = string
   default     = "db-f1-micro"
 }
 
 variable "db_name" {
   description = "Name for the db"
+  type        = string
   default     = "default"
 }
 
 variable "name_override" {
   description = "You may optionally override the name_prefix + random string by specifying an override"
-  default     = ""
+  type        = string
+  default     = null
 }
 
 # When configuring a public IP instance, you should only allow secure connections
 # For testing purposes, we're initially allowing unsecured connections.
 variable "require_ssl" {
   description = "True if the instance should require SSL/TLS for users connecting over IP. Note: SSL/TLS is needed to provide security when you connect to Cloud SQL using IP addresses. If you are connecting to your instance only by using the Cloud SQL Proxy or the Java Socket Library, you do not need to configure your instance to use SSL/TLS."
+  type        = bool
   default     = false
 }

examples/postgres-replicas/README.md

@@ -1,6 +1,10 @@
 # PostgreSQL Cloud SQL HA Example
 
-This folder contains an example of how to use the [Cloud SQL module](/modules/cloud-sql) to create a [High Availability](https://cloud.google.com/sql/docs/postgres/high-availability) [Google Cloud SQL](https://cloud.google.com/sql/) 
+<!-- NOTE: We use absolute linking here instead of relative linking, because the terraform registry does not support
+           relative linking correctly.
+-->
+
+This folder contains an example of how to use the [Cloud SQL module](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql) to create a [High Availability](https://cloud.google.com/sql/docs/postgres/high-availability) [Google Cloud SQL](https://cloud.google.com/sql/) 
 [PostgreSQL](https://cloud.google.com/sql/docs/postgres/) database cluster with a [public IP address](https://cloud.google.com/sql/docs/postgres/connect-external-app#appaccessIP) and a [read replica](https://cloud.google.com/sql/docs/postgres/replication/). 
 
 ## How do you run this example?

examples/postgres-replicas/main.tf

@@ -7,15 +7,15 @@
 # ------------------------------------------------------------------------------
 
 provider "google-beta" {
-  version = "~> 2.1.0"
-  region  = "${var.region}"
-  project = "${var.project}"
+  version = "~> 2.7.0"
+  project = var.project
+  region  = var.region
 }
 
-# Use Terraform 0.10.x so that we can take advantage of Terraform GCP functionality as a separate provider via
-# https://github.com/terraform-providers/terraform-provider-google
 terraform {
-  required_version = ">= 0.10.3"
+  # The modules used in this example have been updated with 0.12 syntax, which means the example is no longer
+  # compatible with any versions below 0.12.
+  required_version = ">= 0.12"
 }
 
 # ------------------------------------------------------------------------------
@@ -28,7 +28,7 @@ resource "random_id" "name" {
 
 locals {
   # If name_override is specified, use that - otherwise use the name_prefix with a random string
-  instance_name        = "${length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override}"
+  instance_name        = var.name_override == null ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override
   private_network_name = "private-network-${random_id.name.hex}"
   private_ip_name      = "private-ip-${random_id.name.hex}"
 }
@@ -40,18 +40,18 @@ locals {
 module "postgres" {
   # When using these modules in your own templates, you will need to use a Git URL with a ref attribute that pins you
   # to a specific version of the modules, such as the following example:
-  # source = "git::git@github.com:gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.1.0"
+  # source = "github.com/gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.2.0"
   source = "../../modules/cloud-sql"
 
-  project = "${var.project}"
-  region  = "${var.region}"
-  name    = "${local.instance_name}"
-  db_name = "${var.db_name}"
+  project = var.project
+  region  = var.region
+  name    = local.instance_name
+  db_name = var.db_name
 
-  engine       = "${var.postgres_version}"
-  machine_type = "${var.machine_type}"
+  engine       = var.postgres_version
+  machine_type = var.machine_type
 
-  master_zone = "${var.master_zone}"
+  master_zone = var.master_zone
 
   # To make it easier to test this example, we are giving the servers public IP addresses and allowing inbound
   # connections from anywhere. In real-world usage, your servers should live in private subnets, only have private IP
@@ -69,17 +69,15 @@ module "postgres" {
   enable_failover_replica = true
 
   # Indicate we want read replicas to be created
-  num_read_replicas  = "${var.num_read_replicas}"
-  read_replica_zones = ["${var.read_replica_zones}"]
+  num_read_replicas  = var.num_read_replicas
+  read_replica_zones = var.read_replica_zones
 
   # These together will construct the master_user privileges, i.e.
-  # 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'.
+  # 'master_user_name' IDENTIFIED BY 'master_user_password'.
   # These should typically be set as the environment variable TF_VAR_master_user_password, etc.
   # so you don't check these into source control."
-  master_user_password = "${var.master_user_password}"
-
-  master_user_name = "${var.master_user_name}"
-  master_user_host = "%"
+  master_user_password = var.master_user_password
+  master_user_name     = var.master_user_name
 
   custom_labels = {
     test-id = "postgres-replicas-example"

examples/postgres-replicas/outputs.tf

@@ -4,22 +4,22 @@
 
 output "master_instance_name" {
   description = "The name of the database instance"
-  value       = "${module.postgres.master_instance_name}"
+  value       = module.postgres.master_instance_name
 }
 
 output "master_public_ip" {
   description = "The public IPv4 address of the master instance"
-  value       = "${module.postgres.master_public_ip_address}"
+  value       = module.postgres.master_public_ip_address
 }
 
 output "master_instance" {
   description = "Self link to the master instance"
-  value       = "${module.postgres.master_instance}"
+  value       = module.postgres.master_instance
 }
 
 output "master_proxy_connection" {
   description = "Instance path for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = "${module.postgres.master_proxy_connection}"
+  value       = module.postgres.master_proxy_connection
 }
 
 # ------------------------------------------------------------------------------
@@ -28,12 +28,12 @@ output "master_proxy_connection" {
 
 output "db_name" {
   description = "Name of the default database"
-  value       = "${module.postgres.db_name}"
+  value       = module.postgres.db_name
 }
 
 output "db" {
   description = "Self link to the default database"
-  value       = "${module.postgres.db}"
+  value       = module.postgres.db
 }
 
 # ------------------------------------------------------------------------------
@@ -42,22 +42,22 @@ output "db" {
 
 output "read_replica_instance_names" {
   description = "List of names for the read replica instances"
-  value       = ["${module.postgres.read_replica_instance_names}"]
+  value       = module.postgres.read_replica_instance_names
 }
 
 output "read_replica_public_ips" {
   description = "List of public IPv4 addresses of the read replica instances"
-  value       = ["${module.postgres.read_replica_public_ip_addresses}"]
+  value       = module.postgres.read_replica_public_ip_addresses
 }
 
 output "read_replica_instances" {
   description = "List of self links to the read replica instances"
-  value       = ["${module.postgres.read_replica_instances}"]
+  value       = module.postgres.read_replica_instances
 }
 
 output "read_replica_proxy_connections" {
   description = "List of read replica instance paths for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = ["${module.postgres.read_replica_proxy_connections}"]
+  value       = module.postgres.read_replica_proxy_connections
 }
 
 # Although we don't use the values, this output highlights the JSON encoded output we use in certain
@@ -65,5 +65,5 @@ output "read_replica_proxy_connections" {
 # See https://github.com/hashicorp/terraform/issues/17048
 output "read_replica_server_ca_certs" {
   description = "JSON encoded list of CA Certificates used to connect to the read replica instances via SSL"
-  value       = "${module.postgres.read_replica_server_ca_certs}"
+  value       = module.postgres.read_replica_server_ca_certs
 }

examples/postgres-replicas/variables.tf

@@ -5,27 +5,32 @@
 
 variable "project" {
   description = "The project ID to host the database in."
+  type        = string
 }
 
 variable "region" {
   description = "The region to host the database in (e.g. 'us-central1')."
+  type        = string
 }
 
 variable "master_zone" {
   description = "The preferred zone for the master instance (e.g. 'us-central1-a'). Must be different than 'failover_replica_zone'."
+  type        = string
 }
 
 variable "failover_replica_zone" {
   description = "The preferred zone for the failover instance (e.g. 'us-central1-b'). Must be different than 'master_zone'."
+  type        = string
 }
 
 variable "num_read_replicas" {
   description = "The number of read replicas to create. Cloud SQL will replicate all data from the master to these replicas, which you can use to horizontally scale read traffic."
+  type        = number
 }
 
 variable "read_replica_zones" {
   description = "A list of compute zones where read replicas should be created. List size should match 'num_read_replicas'"
-  type        = "list"
+  type        = list(string)
 
   # Example:
   #  default = ["us-central1-b", "us-central1-c"]
@@ -34,36 +39,44 @@ variable "read_replica_zones" {
 # Note, after a name db instance is used, it cannot be reused for up to one week.
 variable "name_prefix" {
   description = "The name prefix for the database instance. Will be appended with a random string. Use lowercase letters, numbers, and hyphens. Start with a letter."
+  type        = string
 }
 
 variable "master_user_name" {
   description = "The username part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_name so you don't check it into source control."
+  type        = string
 }
 
 variable "master_user_password" {
   description = "The password part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_password so you don't check it into source control."
+  type        = string
 }
 
 # ---------------------------------------------------------------------------------------------------------------------
 # OPTIONAL PARAMETERS
 # Generally, these values won't need to be changed.
 # ---------------------------------------------------------------------------------------------------------------------
+
 variable "postgres_version" {
   description = "The engine version of the database, e.g. `POSTGRES_9_6`. See https://cloud.google.com/sql/docs/features for supported versions."
+  type        = string
   default     = "POSTGRES_9_6"
 }
 
 variable "machine_type" {
   description = "The machine type to use, see https://cloud.google.com/sql/pricing for more details"
+  type        = string
   default     = "db-f1-micro"
 }
 
 variable "db_name" {
   description = "Name for the db"
+  type        = string
   default     = "default"
 }
 
 variable "name_override" {
   description = "You may optionally override the name_prefix + random string by specifying an override"
-  default     = ""
+  type        = string
+  default     = null
 }

main.tf

@@ -7,15 +7,15 @@
 # ------------------------------------------------------------------------------
 
 provider "google-beta" {
-  version = "~> 2.1.0"
-  region  = "${var.region}"
-  project = "${var.project}"
+  version = "~> 2.7.0"
+  project = var.project
+  region  = var.region
 }
 
-# Use Terraform 0.10.x so that we can take advantage of Terraform GCP functionality as a separate provider via
-# https://github.com/terraform-providers/terraform-provider-google
 terraform {
-  required_version = ">= 0.10.3"
+  # The modules used in this example have been updated with 0.12 syntax, which means the example is no longer
+  # compatible with any versions below 0.12.
+  required_version = ">= 0.12"
 }
 
 # ------------------------------------------------------------------------------
@@ -28,7 +28,7 @@ resource "random_id" "name" {
 
 locals {
   # If name_override is specified, use that - otherwise use the name_prefix with a random string
-  instance_name        = "${length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override}"
+  instance_name        = length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override
   private_network_name = "private-network-${random_id.name.hex}"
   private_ip_name      = "private-ip-${random_id.name.hex}"
 }
@@ -39,26 +39,26 @@ locals {
 
 # Simple network, auto-creates subnetworks
 resource "google_compute_network" "private_network" {
-  provider = "google-beta"
-  name     = "${local.private_network_name}"
+  provider = google-beta
+  name     = local.private_network_name
 }
 
 # Reserve global internal address range for the peering
 resource "google_compute_global_address" "private_ip_address" {
-  provider      = "google-beta"
-  name          = "${local.private_ip_name}"
+  provider      = google-beta
+  name          = local.private_ip_name
   purpose       = "VPC_PEERING"
   address_type  = "INTERNAL"
   prefix_length = 16
-  network       = "${google_compute_network.private_network.self_link}"
+  network       = google_compute_network.private_network.self_link
 }
 
 # Establish VPC network peering connection using the reserved address range
 resource "google_service_networking_connection" "private_vpc_connection" {
-  provider                = "google-beta"
-  network                 = "${google_compute_network.private_network.self_link}"
+  provider                = google-beta
+  network                 = google_compute_network.private_network.self_link
   service                 = "servicenetworking.googleapis.com"
-  reserved_peering_ranges = ["${google_compute_global_address.private_ip_address.name}"]
+  reserved_peering_ranges = [google_compute_global_address.private_ip_address.name]
 }
 
 # ------------------------------------------------------------------------------
@@ -68,31 +68,31 @@ resource "google_service_networking_connection" "private_vpc_connection" {
 module "postgres" {
   # When using these modules in your own templates, you will need to use a Git URL with a ref attribute that pins you
   # to a specific version of the modules, such as the following example:
-  # source = "git::git@github.com:gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.1.0"
+  # source = "github.com/gruntwork-io/terraform-google-sql.git//modules/cloud-sql?ref=v0.2.0"
   source = "./modules/cloud-sql"
 
-  project = "${var.project}"
-  region  = "${var.region}"
-  name    = "${local.instance_name}"
-  db_name = "${var.db_name}"
+  project = var.project
+  region  = var.region
+  name    = local.instance_name
+  db_name = var.db_name
 
-  engine       = "${var.postgres_version}"
-  machine_type = "${var.machine_type}"
+  engine       = var.postgres_version
+  machine_type = var.machine_type
 
   # These together will construct the master_user privileges, i.e.
   # 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'.
   # These should typically be set as the environment variable TF_VAR_master_user_password, etc.
   # so you don't check these into source control."
-  master_user_password = "${var.master_user_password}"
+  master_user_password = var.master_user_password
 
-  master_user_name = "${var.master_user_name}"
+  master_user_name = var.master_user_name
   master_user_host = "%"
 
   # Pass the private network link to the module
-  private_network = "${google_compute_network.private_network.self_link}"
+  private_network = google_compute_network.private_network.self_link
 
   # Wait for the vpc connection to complete
-  wait_for = "${google_service_networking_connection.private_vpc_connection.network}"
+  dependencies = [google_service_networking_connection.private_vpc_connection.network]
 
   custom_labels = {
     test-id = "postgres-private-ip-example"

modules/cloud-sql/README-MySQL.md

@@ -0,0 +1,20 @@
+<!--
+:type: service
+:name: MySQL
+:description: Deploy and manage MySQL on GCP using Google's Cloud SQL Service
+:icon: /_docs/mysql.png
+:category: database
+:cloud: gcp
+:tags: data, database, sql, mysql
+:license: open-source
+:built-with: terraform
+-->
+# MySQL
+[![Maintained by Gruntwork.io](https://img.shields.io/badge/maintained%20by-gruntwork.io-%235849a6.svg)](https://gruntwork.io/?ref=repo_google_cloudsql)
+[![GitHub tag (latest SemVer)](https://img.shields.io/github/tag/gruntwork-io/terraform-google-sql.svg?label=latest)](http://github.com/gruntwork-io/terraform-google-sql/releases/latest)
+![Terraform Version](https://img.shields.io/badge/tf-%3E%3D0.12.0-blue.svg)
+
+This module deploys MySQL on top of Google's Cloud SQL Service. The cluster is managed by GCP and automatically handles 
+standby failover, read replicas, backups, patching, and encryption.
+
+[README.md](./README.md)

modules/cloud-sql/README-PostgreSQL.md

@@ -0,0 +1,20 @@
+<!--
+:type: service
+:name: PostgreSQL
+:description: Deploy and manage PostgreSQL on GCP using Google's Cloud SQL Service
+:icon: /_docs/postgresql.png
+:category: database
+:cloud: gcp
+:tags: data, database, sql, postgresql
+:license: open-source
+:built-with: terraform
+-->
+# PostgreSQL
+[![Maintained by Gruntwork.io](https://img.shields.io/badge/maintained%20by-gruntwork.io-%235849a6.svg)](https://gruntwork.io/?ref=repo_google_cloudsql)
+[![GitHub tag (latest SemVer)](https://img.shields.io/github/tag/gruntwork-io/terraform-google-sql.svg?label=latest)](http://github.com/gruntwork-io/terraform-google-sql/releases/latest)
+![Terraform Version](https://img.shields.io/badge/tf-%3E%3D0.12.0-blue.svg)
+
+This module deploys PostgreSQL on top of Google's Cloud SQL Service. The cluster is managed by GCP and automatically handles 
+standby failover, read replicas, backups, patching, and encryption.
+
+[README.md](./README.md)

modules/cloud-sql/README.md

@@ -1,84 +1,85 @@
 # Cloud SQL Module
 
+[![Maintained by Gruntwork.io](https://img.shields.io/badge/maintained%20by-gruntwork.io-%235849a6.svg)](https://gruntwork.io/?ref=repo_google_cloudsql)
+[![GitHub tag (latest SemVer)](https://img.shields.io/github/tag/gruntwork-io/terraform-google-sql.svg?label=latest)](http://github.com/gruntwork-io/terraform-google-sql/releases/latest)
+![Terraform Version](https://img.shields.io/badge/tf-%3E%3D0.12.0-blue.svg)
+
+
+<!-- NOTE: We use absolute linking here instead of relative linking, because the terraform registry does not support
+           relative linking correctly.
+-->
+
 This module creates a [Google Cloud SQL](https://cloud.google.com/sql/) cluster. 
 The cluster is managed by Google, automating backups, replication, patches, and updates. 
 
 This module helps you run [MySQL](https://cloud.google.com/sql/docs/mysql/) and [PostgreSQL](https://cloud.google.com/sql/docs/postgres/) databases in [Google Cloud](https://cloud.google.com/).
 
-## How do you use this module?
+## Cloud SQL Architecture
 
-See the [examples](/examples) folder for an example. 
+![Cloud SQL Architecture](https://github.com/gruntwork-io/terraform-google-sql/blob/master/_docs/cloud-sql.png "Cloud SQL Architecture")
 
-## How do you configure this module?
+## Features
 
-This module allows you to configure a number of parameters, such as high availability, backup windows, maintenance window and replicas. 
-For a list of all available variables and their descriptions, see [variables.tf](./variables.tf).
+- Deploy a fully-managed relational database
+- Supports MySQL and PostgreSQL
+- Optional failover instances
+- Optional read replicas
 
-## How do you connect to the database?
+## Learn
 
-**Cloud SQL instances are created in a producer network (a VPC network internal to Google). They are not created in your VPC network. See https://cloud.google.com/sql/docs/mysql/private-ip**
- 
-You can use both public IP and private IP to connect to a Cloud SQL instance. 
-Neither connection method affects the other; you must protect the public IP connection whether the instance is configured to use private IP or not.
+This repo is a part of [the Gruntwork Infrastructure as Code Library](https://gruntwork.io/infrastructure-as-code-library/), a collection of reusable, battle-tested, production ready infrastructure code. If you’ve never used the Infrastructure as Code Library before, make sure to read [How to use the Gruntwork Infrastructure as Code Library](https://gruntwork.io/guides/foundations/how-to-use-gruntwork-infrastructure-as-code-library/)!
 
-You can also use the [Cloud SQL Proxy for MySQL](https://cloud.google.com/sql/docs/mysql/sql-proxy) and [Cloud SQL Proxy for PostgreSQL](https://cloud.google.com/sql/docs/postgres/sql-proxy) 
-to connect to an instance that is also configured to use private IP. The proxy can connect using either the private IP address or a public IP address.
+### Core concepts
 
-This module provides the connection details as [Terraform output 
-variables](https://www.terraform.io/intro/getting-started/outputs.html). Use the public / private addresses depending on your configuration:
+- [What is Cloud SQL](https://github.com/gruntwork-io/terraform-google-sql/blob/master/modules/cloud-sql/core-concepts.md#what-is-cloud-sql)
+- [Cloud SQL documentation](https://cloud.google.com/sql/docs/)
+- **[Designing Data Intensive Applications](https://dataintensive.net/)**: the best book we’ve found for understanding data systems, including relational databases, NoSQL, replication, sharding, consistency, and so on.
 
+### Repo organisation
 
-1. **Master Public IP Address** `master_public_ip_address`: The public IPv4 address of the master instance.
-1. **Master Private IP Address** `master_private_ip_address`: The private IPv4 address of the master instance.
-1. **Master Proxy connection** `master_proxy_connection`: Instance path for connecting with Cloud SQL Proxy; see [Connecting mysql Client Using the Cloud SQL Proxy](https://cloud.google.com/sql/docs/mysql/connect-admin-proxy).
-1. **Read Replica Public IP Addresses** `read_replica_public_ip_addresses`: A list of read replica public IP addresses in the cluster. Use these addresses for reads (see "How do you scale this database?" below).
-1. **Read Replica Private IP Addresses** `read_replica_private_ip_addresses`: A list of read replica private IP addresses in the cluster. Use these addresses for reads (see "How do you scale this database?" below).
-1. **Read Replica Proxy Connections** `read_replica_proxy_connections`: A list of instance paths for connecting with Cloud SQL Proxy; see [Connecting Using the Cloud SQL Proxy](https://cloud.google.com/sql/docs/mysql/connect-admin-proxy).
+This repo has the following folder structure:
 
+- [root](https://github.com/gruntwork-io/terraform-google-sql/tree/master): The root folder contains an example of how
+  to deploy a private PostgreSQL instance in Cloud SQL. See [postgres-private-ip](https://github.com/gruntwork-io/terraform-google-sql/blob/master/examples/postgres-private-ip)
+  for the documentation.
 
-You can programmatically extract these variables in your Terraform templates and pass them to other resources. 
-You'll also see the variables at the end of each `terraform apply` call or if you run `terraform output`.
+- [modules](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules): This folder contains the
+  main implementation code for this Module, broken down into multiple standalone submodules.
 
-For full connectivity options and detailed documentation, see [Connecting to Cloud SQL MySQL from External Applications](https://cloud.google.com/sql/docs/mysql/connect-external-app) and [Connecting to Cloud SQL PostgreSQL from External Applications](https://cloud.google.com/sql/docs/postgres/external-connection-methods).
+  The primary module is:
 
-## How do you configure High Availability?
+  - [cloud-sql](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql): Deploy a Cloud SQL [MySQL](https://cloud.google.com/sql/docs/mysql/) or [PostgreSQL](https://cloud.google.com/sql/docs/postgres/) database.
+  
+- [examples](https://github.com/gruntwork-io/terraform-google-sql/tree/master/examples): This folder contains
+  examples of how to use the submodules.
 
-You can enable High Availability using the `enable_failover_replica` input variable.
+- [test](https://github.com/gruntwork-io/terraform-google-sql/tree/master/test): Automated tests for the submodules
+  and examples.
 
-### High Availability for MySQL
+## Deploy
 
-The configuration is made up of a primary instance (master) in the primary zone (`master_zone` input variable) and a failover replica in the secondary zone (`failover_replica_zone` input variable).
-The failover replica is configured with the same database flags, users and passwords, authorized applications and networks, and databases as the primary instance.
+### Non-production deployment (quick start for learning)
 
-For full details about MySQL High Availability, see https://cloud.google.com/sql/docs/mysql/high-availability
+If you just want to try this repo out for experimenting and learning, check out the following resources:
 
-### High Availability for PostgreSQL
+- [examples folder](https://github.com/gruntwork-io/terraform-google-sql/blob/master/examples): The `examples` folder contains sample code optimized for learning, experimenting, and testing (but not production usage).
 
-A Cloud SQL PostgreSQL instance configured for HA is also called a _regional instance_ and is located in a primary and secondary zone within the configured region. Within a regional instance, 
-the configuration is made up of a primary instance (master) and a standby instance. You control the primary zone for the master instance
-with input variable `master_zone` and Google will automatically place the standby instance in another zone. 
+### Production deployment
 
-For full details about PostgreSQL High Availability, see https://cloud.google.com/sql/docs/postgres/high-availability
+If you want to deploy this repo in production, check out the following resources:
 
+- [cloud-sql module in the GCP Reference Architecture](https://github.com/gruntwork-io/infrastructure-modules-google/tree/master/data-stores/cloud-sql): 
+Production-ready sample code from the GCP Reference Architecture. Note that the repository is private and accessible only with 
+Gruntwork subscription. To get access, [subscribe now](https://www.gruntwork.io/pricing/) or contact us at [support@gruntwork.io](mailto:support@gruntwork.io) for more information.
 
-## How do you secure this database?
+## Manage
 
-Cloud SQL customer data is encrypted when stored in database tables, temporary files, and backups. 
-External connections can be encrypted by using SSL, or by using the Cloud SQL Proxy, which automatically encrypts traffic to and from the database.
-If you do not use the proxy, you can enforce SSL for external connections using the `require_ssl` input variable.
+### Day-to-day operations
 
-For further information, see https://cloud.google.com/blog/products/gcp/best-practices-for-securing-your-google-cloud-databases and 
-https://cloud.google.com/sql/faq#encryption
-
-## How do you scale this database?
-
-* **Storage**: Cloud SQL manages storage for you, automatically growing cluster volume up to 10TB You can set the 
-initial disk size using the `disk_size` input variable.
-* **Vertical scaling**: To scale vertically (i.e. bigger DB instances with more CPU and RAM), use the `machine_type` 
-  input variable. For a list of Cloud SQL Machine Types, see [Cloud SQL Pricing](https://cloud.google.com/sql/pricing#2nd-gen-pricing).
-* **Horizontal scaling**: To scale horizontally, you can add more replicas using the `num_read_replicas` and `read_replica_zones` input variables, 
-  and the module will automatically deploy the new instances, sync them to the master, and make them available as read 
-  replicas.
+- [How to connect to a Cloud SQL instance](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql/core-concepts.md#how-do-you-connect-to-the-database)
+- [How to configure high availability](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql/core-concepts.md#how-do-you-configure-high-availability)
+- [How to secure the database instance](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql/core-concepts.md#how-do-you-secure-the-database)
+- [How to scale the database](https://github.com/gruntwork-io/terraform-google-sql/tree/master/modules/cloud-sql/core-concepts.md#how-do-you-secure-the-database)
 
 ## Known Issues
 
@@ -88,12 +89,18 @@ Due to limitations on the current `terraform` provider for Google, it is not pos
 
 See https://github.com/terraform-providers/terraform-provider-google/issues/2446
 
-### Read Replica and IP Addresses Outputs
+## Support
 
-Retrieving and outputting distinct values from list of maps is not possible with resources using `count` prior to `terraform 0.12`. 
-Instead we have to output the values JSON encoded - for example `read_replica_server_ca_certs`. For full details of the outputs and 
-their format, see [outputs.tf](./outputs.tf).
+If you need help with this repo or anything else related to infrastructure or DevOps, Gruntwork offers [Commercial Support](https://gruntwork.io/support/) via Slack, email, and phone/video. If you’re already a Gruntwork customer, hop on Slack and ask away! If not, [subscribe now](https://www.gruntwork.io/pricing/). If you’re not sure, feel free to email us at [support@gruntwork.io](mailto:support@gruntwork.io).
 
-See https://github.com/hashicorp/terraform/issues/17048
+## Contributions
 
+Contributions to this repo are very welcome and appreciated! If you find a bug or want to add a new feature or even contribute an entirely new module, we are very happy to accept pull requests, provide feedback, and run your changes through our automated test suite.
 
+Please see [Contributing to the Gruntwork Infrastructure as Code Library](https://gruntwork.io/guides/foundations/how-to-use-gruntwork-infrastructure-as-code-library/#contributing-to-the-gruntwork-infrastructure-as-code-library) for instructions.
+
+## License
+
+Please see [LICENSE](https://github.com/gruntwork-io/terraform-google-sql/blob/master/LICENSE.txt) for details on how the code in this repo is licensed.
+
+Copyright &copy; 2019 Gruntwork, Inc.

modules/cloud-sql/compute_outputs.tf

@@ -8,14 +8,14 @@
 
 locals {
   # Replica proxy connection info
-  failover_proxy_connection = "${join("",data.template_file.failover_proxy_connection.*.rendered)}"
+  failover_proxy_connection = join("", data.template_file.failover_proxy_connection.*.rendered)
 
   # Replica certificate info
-  failover_certificate                  = "${join("",data.template_file.failover_certificate.*.rendered)}"
-  failover_certificate_common_name      = "${join("",data.template_file.failover_certificate_common_name.*.rendered)}"
-  failover_certificate_create_time      = "${join("",data.template_file.failover_certificate_create_time.*.rendered)}"
-  failover_certificate_expiration_time  = "${join("",data.template_file.failover_certificate_expiration_time.*.rendered)}"
-  failover_certificate_sha1_fingerprint = "${join("",data.template_file.failover_certificate_sha1_fingerprint.*.rendered)}"
+  failover_certificate                  = join("", data.template_file.failover_certificate.*.rendered)
+  failover_certificate_common_name      = join("", data.template_file.failover_certificate_common_name.*.rendered)
+  failover_certificate_create_time      = join("", data.template_file.failover_certificate_create_time.*.rendered)
+  failover_certificate_expiration_time  = join("", data.template_file.failover_certificate_expiration_time.*.rendered)
+  failover_certificate_sha1_fingerprint = join("", data.template_file.failover_certificate_sha1_fingerprint.*.rendered)
 }
 
 # ------------------------------------------------------------------------------
@@ -23,7 +23,7 @@ locals {
 # ------------------------------------------------------------------------------
 
 data "template_file" "failover_proxy_connection" {
-  count    = "${local.actual_failover_replica_count}"
+  count    = local.actual_failover_replica_count
   template = "${var.project}:${var.region}:${google_sql_database_instance.failover_replica.0.name}"
 }
 
@@ -36,28 +36,28 @@ data "template_file" "failover_proxy_connection" {
 # ------------------------------------------------------------------------------
 
 data "template_file" "failover_certificate" {
-  count    = "${local.actual_failover_replica_count}"
-  template = "${google_sql_database_instance.failover_replica.0.server_ca_cert.0.cert}"
+  count    = local.actual_failover_replica_count
+  template = google_sql_database_instance.failover_replica.0.server_ca_cert.0.cert
 }
 
 data "template_file" "failover_certificate_common_name" {
-  count    = "${local.actual_failover_replica_count}"
-  template = "${google_sql_database_instance.failover_replica.0.server_ca_cert.0.common_name}"
+  count    = local.actual_failover_replica_count
+  template = google_sql_database_instance.failover_replica.0.server_ca_cert.0.common_name
 }
 
 data "template_file" "failover_certificate_create_time" {
-  count    = "${local.actual_failover_replica_count}"
-  template = "${google_sql_database_instance.failover_replica.0.server_ca_cert.0.create_time}"
+  count    = local.actual_failover_replica_count
+  template = google_sql_database_instance.failover_replica.0.server_ca_cert.0.create_time
 }
 
 data "template_file" "failover_certificate_expiration_time" {
-  count    = "${local.actual_failover_replica_count}"
-  template = "${google_sql_database_instance.failover_replica.0.server_ca_cert.0.expiration_time}"
+  count    = local.actual_failover_replica_count
+  template = google_sql_database_instance.failover_replica.0.server_ca_cert.0.expiration_time
 }
 
 data "template_file" "failover_certificate_sha1_fingerprint" {
-  count    = "${local.actual_failover_replica_count}"
-  template = "${google_sql_database_instance.failover_replica.0.server_ca_cert.0.sha1_fingerprint}"
+  count    = local.actual_failover_replica_count
+  template = google_sql_database_instance.failover_replica.0.server_ca_cert.0.sha1_fingerprint
 }
 
 # ------------------------------------------------------------------------------
@@ -65,6 +65,6 @@ data "template_file" "failover_certificate_sha1_fingerprint" {
 # ------------------------------------------------------------------------------
 
 data "template_file" "read_replica_proxy_connection" {
-  count    = "${var.num_read_replicas}"
+  count    = var.num_read_replicas
   template = "${var.project}:${var.region}:${google_sql_database_instance.read_replica.*.name[count.index]}"
 }

modules/cloud-sql/core-concepts.md

@@ -0,0 +1,79 @@
+# Core Cloud SQL Concepts
+
+## What is Cloud SQL?
+
+Cloud SQL is Google's fully-managed database service that makes it easy to set up, maintain, manage, and administer
+your relational databases on Google Cloud Platform. Cloud SQL automatically includes:
+
+- Data replication between multiple zones with automatic failover.
+- Automated and on-demand backups, and point-in-time recovery.
+- Data encryption on networks, database tables, temporary files, and backups.
+- Secure external connections with the [Cloud SQL Proxy](https://cloud.google.com/sql/docs/mysql/sql-proxy) or with the SSL/TLS protocol.
+
+You can learn more about Cloud SQL from [the official documentation](https://cloud.google.com/sql/docs/).
+
+## How do you connect to the database?
+
+**Cloud SQL instances are created in a producer network (a VPC network internal to Google). They are not created in your VPC network. See https://cloud.google.com/sql/docs/mysql/private-ip**
+
+You can use both public IP and private IP to connect to a Cloud SQL instance. 
+Neither connection method affects the other; you must protect the public IP connection whether the instance is configured to use private IP or not.
+
+You can also use the [Cloud SQL Proxy for MySQL](https://cloud.google.com/sql/docs/mysql/sql-proxy) and [Cloud SQL Proxy for PostgreSQL](https://cloud.google.com/sql/docs/postgres/sql-proxy) 
+to connect to an instance that is also configured to use private IP. The proxy can connect using either the private IP address or a public IP address.
+
+This module provides the connection details as [Terraform output 
+variables](https://www.terraform.io/intro/getting-started/outputs.html). Use the public / private addresses depending on your configuration:
+
+
+1. **Master Public IP Address** `master_public_ip_address`: The public IPv4 address of the master instance.
+1. **Master Private IP Address** `master_private_ip_address`: The private IPv4 address of the master instance.
+1. **Master Proxy connection** `master_proxy_connection`: Instance path for connecting with Cloud SQL Proxy; see [Connecting mysql Client Using the Cloud SQL Proxy](https://cloud.google.com/sql/docs/mysql/connect-admin-proxy).
+1. **Read Replica Public IP Addresses** `read_replica_public_ip_addresses`: A list of read replica public IP addresses in the cluster. Use these addresses for reads (see "How do you scale this database?" below).
+1. **Read Replica Private IP Addresses** `read_replica_private_ip_addresses`: A list of read replica private IP addresses in the cluster. Use these addresses for reads (see "How do you scale this database?" below).
+1. **Read Replica Proxy Connections** `read_replica_proxy_connections`: A list of instance paths for connecting with Cloud SQL Proxy; see [Connecting Using the Cloud SQL Proxy](https://cloud.google.com/sql/docs/mysql/connect-admin-proxy).
+
+
+You can programmatically extract these variables in your Terraform templates and pass them to other resources. 
+You'll also see the variables at the end of each `terraform apply` call or if you run `terraform output`.
+
+For full connectivity options and detailed documentation, see [Connecting to Cloud SQL MySQL from External Applications](https://cloud.google.com/sql/docs/mysql/connect-external-app) and [Connecting to Cloud SQL PostgreSQL from External Applications](https://cloud.google.com/sql/docs/postgres/external-connection-methods).
+
+## How do you configure High Availability?
+
+You can enable High Availability using the `enable_failover_replica` input variable.
+
+### High Availability for MySQL
+
+The configuration is made up of a primary instance (master) in the primary zone (`master_zone` input variable) and a failover replica in the secondary zone (`failover_replica_zone` input variable).
+The failover replica is configured with the same database flags, users and passwords, authorized applications and networks, and databases as the primary instance.
+
+For full details about MySQL High Availability, see https://cloud.google.com/sql/docs/mysql/high-availability
+
+### High Availability for PostgreSQL
+
+A Cloud SQL PostgreSQL instance configured for HA is also called a _regional instance_ and is located in a primary and secondary zone within the configured region. Within a regional instance, 
+the configuration is made up of a primary instance (master) and a standby instance. You control the primary zone for the master instance
+with input variable `master_zone` and Google will automatically place the standby instance in another zone. 
+
+For full details about PostgreSQL High Availability, see https://cloud.google.com/sql/docs/postgres/high-availability
+
+
+## How do you secure the database?
+
+Cloud SQL customer data is encrypted when stored in database tables, temporary files, and backups. 
+External connections can be encrypted by using SSL, or by using the Cloud SQL Proxy, which automatically encrypts traffic to and from the database.
+If you do not use the proxy, you can enforce SSL for external connections using the `require_ssl` input variable.
+
+For further information, see https://cloud.google.com/blog/products/gcp/best-practices-for-securing-your-google-cloud-databases and 
+https://cloud.google.com/sql/faq#encryption
+
+## How do you scale the database?
+
+* **Storage**: Cloud SQL manages storage for you, automatically growing cluster volume up to 10TB You can set the 
+  initial disk size using the `disk_size` input variable.
+* **Vertical scaling**: To scale vertically (i.e. bigger DB instances with more CPU and RAM), use the `machine_type` 
+  input variable. For a list of Cloud SQL Machine Types, see [Cloud SQL Pricing](https://cloud.google.com/sql/pricing#2nd-gen-pricing).
+* **Horizontal scaling**: To scale horizontally, you can add more replicas using the `num_read_replicas` and `read_replica_zones` input variables, 
+  and the module will automatically deploy the new instances, sync them to the master, and make them available as read 
+  replicas.

modules/cloud-sql/main.tf

@@ -13,13 +13,13 @@
 
 locals {
   # Determine the engine type
-  is_postgres = "${replace(var.engine, "POSTGRES", "") != var.engine}"
-  is_mysql    = "${replace(var.engine, "MYSQL", "") != var.engine}"
+  is_postgres = replace(var.engine, "POSTGRES", "") != var.engine
+  is_mysql    = replace(var.engine, "MYSQL", "") != var.engine
 
   # Calculate actuals, so we get expected behavior for each engine
-  actual_binary_log_enabled     = "${local.is_postgres ? false : var.mysql_binary_log_enabled}"
-  actual_availability_type      = "${local.is_postgres && var.enable_failover_replica ? "REGIONAL" : "ZONAL"}"
-  actual_failover_replica_count = "${local.is_postgres ? 0 : var.enable_failover_replica ? 1 : 0}"
+  actual_binary_log_enabled     = local.is_postgres ? false : var.mysql_binary_log_enabled
+  actual_availability_type      = local.is_postgres && var.enable_failover_replica ? "REGIONAL" : "ZONAL"
+  actual_failover_replica_count = local.is_postgres ? 0 : var.enable_failover_replica ? 1 : 0
 }
 
 # ------------------------------------------------------------------------------
@@ -30,59 +30,74 @@ locals {
 # ------------------------------------------------------------------------------
 
 resource "google_sql_database_instance" "master" {
-  depends_on = ["null_resource.dependency_getter"]
+  depends_on = [null_resource.dependency_getter]
 
-  provider         = "google-beta"
-  name             = "${var.name}"
-  project          = "${var.project}"
-  region           = "${var.region}"
-  database_version = "${var.engine}"
+  provider         = google-beta
+  name             = var.name
+  project          = var.project
+  region           = var.region
+  database_version = var.engine
 
   settings {
-    tier                        = "${var.machine_type}"
-    activation_policy           = "${var.activation_policy}"
-    authorized_gae_applications = ["${var.authorized_gae_applications}"]
-    disk_autoresize             = "${var.disk_autoresize}"
+    tier                        = var.machine_type
+    activation_policy           = var.activation_policy
+    authorized_gae_applications = var.authorized_gae_applications
+    disk_autoresize             = var.disk_autoresize
 
     ip_configuration {
-      authorized_networks = ["${var.authorized_networks}"]
-      ipv4_enabled        = "${var.enable_public_internet_access}"
-      private_network     = "${var.private_network}"
-      require_ssl         = "${var.require_ssl}"
+      dynamic "authorized_networks" {
+        for_each = var.authorized_networks
+        content {
+          name  = lookup(authorized_networks.value, "name", null)
+          value = authorized_networks.value.value
+        }
+      }
+
+      ipv4_enabled    = var.enable_public_internet_access
+      private_network = var.private_network
+      require_ssl     = var.require_ssl
     }
 
     location_preference {
-      follow_gae_application = "${var.follow_gae_application}"
-      zone                   = "${var.master_zone}"
+      follow_gae_application = var.follow_gae_application
+      zone                   = var.master_zone
     }
 
     backup_configuration {
-      binary_log_enabled = "${local.actual_binary_log_enabled}"
-      enabled            = "${var.backup_enabled}"
-      start_time         = "${var.backup_start_time}"
+      binary_log_enabled             = local.actual_binary_log_enabled
+      enabled                        = var.backup_enabled
+      start_time                     = var.backup_start_time
+      point_in_time_recovery_enabled = var.point_in_time_recovery_enabled
     }
 
     maintenance_window {
-      day          = "${var.maintenance_window_day}"
-      hour         = "${var.maintenance_window_hour}"
-      update_track = "${var.maintenance_track}"
+      day          = var.maintenance_window_day
+      hour         = var.maintenance_window_hour
+      update_track = var.maintenance_track
     }
 
-    disk_size         = "${var.disk_size}"
-    disk_type         = "${var.disk_type}"
-    database_flags    = ["${var.database_flags}"]
-    availability_type = "${local.actual_availability_type}"
+    disk_size         = var.disk_size
+    disk_type         = var.disk_type
+    availability_type = local.actual_availability_type
 
-    user_labels = "${var.custom_labels}"
+    dynamic "database_flags" {
+      for_each = var.database_flags
+      content {
+        name  = database_flags.value.name
+        value = database_flags.value.value
+      }
+    }
+
+    user_labels = var.custom_labels
   }
 
   # Default timeouts are 10 minutes, which in most cases should be enough.
   # Sometimes the database creation can, however, take longer, so we
   # increase the timeouts slightly.
   timeouts {
-    create = "${var.resource_timeout}"
-    delete = "${var.resource_timeout}"
-    update = "${var.resource_timeout}"
+    create = var.resource_timeout
+    delete = var.resource_timeout
+    update = var.resource_timeout
   }
 }
 
@@ -91,23 +106,26 @@ resource "google_sql_database_instance" "master" {
 # ------------------------------------------------------------------------------
 
 resource "google_sql_database" "default" {
-  depends_on = ["google_sql_database_instance.master"]
+  depends_on = [google_sql_database_instance.master]
 
-  name      = "${var.db_name}"
-  project   = "${var.project}"
-  instance  = "${google_sql_database_instance.master.name}"
-  charset   = "${var.db_charset}"
-  collation = "${var.db_collation}"
+  name      = var.db_name
+  project   = var.project
+  instance  = google_sql_database_instance.master.name
+  charset   = var.db_charset
+  collation = var.db_collation
 }
 
 resource "google_sql_user" "default" {
-  depends_on = ["google_sql_database.default"]
+  depends_on = [google_sql_database.default]
 
-  name     = "${var.master_user_name}"
-  project  = "${var.project}"
-  instance = "${google_sql_database_instance.master.name}"
-  host     = "${var.master_user_host}"
-  password = "${var.master_user_password}"
+  project  = var.project
+  name     = var.master_user_name
+  instance = google_sql_database_instance.master.name
+  # Postgres users don't have hosts, so the API will ignore this value which causes Terraform to attempt
+  # to recreate the user each time.
+  # See https://github.com/terraform-providers/terraform-provider-google/issues/1526 for more information.
+  host     = local.is_postgres ? null : var.master_user_host
+  password = var.master_user_password
 }
 
 # ------------------------------------------------------------------------------
@@ -129,22 +147,22 @@ resource "null_resource" "dependency_getter" {
 # ------------------------------------------------------------------------------
 
 resource "google_sql_database_instance" "failover_replica" {
-  count = "${local.actual_failover_replica_count}"
+  count = local.actual_failover_replica_count
 
   depends_on = [
-    "google_sql_database_instance.master",
-    "google_sql_database.default",
-    "google_sql_user.default",
+    google_sql_database_instance.master,
+    google_sql_database.default,
+    google_sql_user.default,
   ]
 
-  provider         = "google-beta"
+  provider         = google-beta
   name             = "${var.name}-failover"
-  project          = "${var.project}"
-  region           = "${var.region}"
-  database_version = "${var.engine}"
+  project          = var.project
+  region           = var.region
+  database_version = var.engine
 
   # The name of the instance that will act as the master in the replication setup.
-  master_instance_name = "${google_sql_database_instance.master.name}"
+  master_instance_name = google_sql_database_instance.master.name
 
   replica_configuration {
     # Specifies that the replica is the failover target.
@@ -154,36 +172,50 @@ resource "google_sql_database_instance" "failover_replica" {
   settings {
     crash_safe_replication = true
 
-    tier                        = "${var.machine_type}"
-    authorized_gae_applications = ["${var.authorized_gae_applications}"]
-    disk_autoresize             = "${var.disk_autoresize}"
+    tier                        = var.machine_type
+    authorized_gae_applications = var.authorized_gae_applications
+    disk_autoresize             = var.disk_autoresize
 
     ip_configuration {
-      authorized_networks = ["${var.authorized_networks}"]
-      ipv4_enabled        = "${var.enable_public_internet_access}"
-      private_network     = "${var.private_network}"
-      require_ssl         = "${var.require_ssl}"
+      dynamic "authorized_networks" {
+        for_each = var.authorized_networks
+        content {
+          name  = authorized_networks.value.name
+          value = authorized_networks.value.value
+        }
+      }
+
+      ipv4_enabled    = var.enable_public_internet_access
+      private_network = var.private_network
+      require_ssl     = var.require_ssl
     }
 
     location_preference {
-      follow_gae_application = "${var.follow_gae_application}"
-      zone                   = "${var.mysql_failover_replica_zone}"
+      follow_gae_application = var.follow_gae_application
+      zone                   = var.mysql_failover_replica_zone
     }
 
-    disk_size      = "${var.disk_size}"
-    disk_type      = "${var.disk_type}"
-    database_flags = ["${var.database_flags}"]
+    disk_size = var.disk_size
+    disk_type = var.disk_type
 
-    user_labels = "${var.custom_labels}"
+    dynamic "database_flags" {
+      for_each = var.database_flags
+      content {
+        name  = database_flags.value.name
+        value = database_flags.value.value
+      }
+    }
+
+    user_labels = var.custom_labels
   }
 
   # Default timeouts are 10 minutes, which in most cases should be enough.
   # Sometimes the database creation can, however, take longer, so we
   # increase the timeouts slightly.
   timeouts {
-    create = "${var.resource_timeout}"
-    delete = "${var.resource_timeout}"
-    update = "${var.resource_timeout}"
+    create = var.resource_timeout
+    delete = var.resource_timeout
+    update = var.resource_timeout
   }
 }
 
@@ -192,23 +224,23 @@ resource "google_sql_database_instance" "failover_replica" {
 # ------------------------------------------------------------------------------
 
 resource "google_sql_database_instance" "read_replica" {
-  count = "${var.num_read_replicas}"
+  count = var.num_read_replicas
 
   depends_on = [
-    "google_sql_database_instance.master",
-    "google_sql_database_instance.failover_replica",
-    "google_sql_database.default",
-    "google_sql_user.default",
+    google_sql_database_instance.master,
+    google_sql_database_instance.failover_replica,
+    google_sql_database.default,
+    google_sql_user.default,
   ]
 
-  provider         = "google-beta"
+  provider         = google-beta
   name             = "${var.name}-read-${count.index}"
-  project          = "${var.project}"
-  region           = "${var.region}"
-  database_version = "${var.engine}"
+  project          = var.project
+  region           = var.region
+  database_version = var.engine
 
   # The name of the instance that will act as the master in the replication setup.
-  master_instance_name = "${google_sql_database_instance.master.name}"
+  master_instance_name = google_sql_database_instance.master.name
 
   replica_configuration {
     # Specifies that the replica is not the failover target.
@@ -216,27 +248,41 @@ resource "google_sql_database_instance" "read_replica" {
   }
 
   settings {
-    tier                        = "${var.machine_type}"
-    authorized_gae_applications = ["${var.authorized_gae_applications}"]
-    disk_autoresize             = "${var.disk_autoresize}"
+    tier                        = var.machine_type
+    authorized_gae_applications = var.authorized_gae_applications
+    disk_autoresize             = var.disk_autoresize
 
     ip_configuration {
-      authorized_networks = ["${var.authorized_networks}"]
-      ipv4_enabled        = "${var.enable_public_internet_access}"
-      private_network     = "${var.private_network}"
-      require_ssl         = "${var.require_ssl}"
+      dynamic "authorized_networks" {
+        for_each = var.authorized_networks
+        content {
+          name  = authorized_networks.value.name
+          value = authorized_networks.value.value
+        }
+      }
+
+      ipv4_enabled    = var.enable_public_internet_access
+      private_network = var.private_network
+      require_ssl     = var.require_ssl
     }
 
     location_preference {
-      follow_gae_application = "${var.follow_gae_application}"
-      zone                   = "${element(var.read_replica_zones, count.index)}"
+      follow_gae_application = var.follow_gae_application
+      zone                   = element(var.read_replica_zones, count.index)
     }
 
-    disk_size      = "${var.disk_size}"
-    disk_type      = "${var.disk_type}"
-    database_flags = ["${var.database_flags}"]
+    disk_size = var.disk_size
+    disk_type = var.disk_type
 
-    user_labels = "${var.custom_labels}"
+    dynamic "database_flags" {
+      for_each = var.database_flags
+      content {
+        name  = database_flags.value.name
+        value = database_flags.value.value
+      }
+    }
+
+    user_labels = var.custom_labels
   }
 
   # Read replica creation is initiated concurrently, but the provider creates
@@ -244,23 +290,24 @@ resource "google_sql_database_instance" "read_replica" {
   # to allow successful creation of multiple read replicas without having to
   # fear the operation timing out.
   timeouts {
-    create = "${var.resource_timeout}"
-    delete = "${var.resource_timeout}"
-    update = "${var.resource_timeout}"
+    create = var.resource_timeout
+    delete = var.resource_timeout
+    update = var.resource_timeout
   }
 }
 
 # ------------------------------------------------------------------------------
 # CREATE A TEMPLATE FILE TO SIGNAL ALL RESOURCES HAVE BEEN CREATED
 # ------------------------------------------------------------------------------
+
 data "template_file" "complete" {
   depends_on = [
-    "google_sql_database_instance.master",
-    "google_sql_database_instance.failover_replica",
-    "google_sql_database_instance.read_replica",
-    "google_sql_database.default",
-    "google_sql_user.default",
+    google_sql_database_instance.master,
+    google_sql_database_instance.failover_replica,
+    google_sql_database_instance.read_replica,
+    google_sql_database.default,
+    google_sql_user.default,
   ]
 
-  template = "true"
+  template = true
 }

modules/cloud-sql/outputs.tf

@@ -4,27 +4,27 @@
 
 output "master_instance_name" {
   description = "The name of the master database instance"
-  value       = "${google_sql_database_instance.master.name}"
+  value       = google_sql_database_instance.master.name
 }
 
 output "master_public_ip_address" {
   description = "The public IPv4 address of the master instance."
-  value       = "${google_sql_database_instance.master.public_ip_address}"
+  value       = google_sql_database_instance.master.public_ip_address
 }
 
 output "master_private_ip_address" {
   description = "The public IPv4 address of the master instance."
-  value       = "${google_sql_database_instance.master.private_ip_address}"
+  value       = google_sql_database_instance.master.private_ip_address
 }
 
 output "master_ip_addresses" {
   description = "All IP addresses of the master instance JSON encoded, see https://www.terraform.io/docs/providers/google/r/sql_database_instance.html#ip_address-0-ip_address"
-  value       = "${jsonencode(google_sql_database_instance.master.ip_address)}"
+  value       = jsonencode(google_sql_database_instance.master.ip_address)
 }
 
 output "master_instance" {
   description = "Self link to the master instance"
-  value       = "${google_sql_database_instance.master.self_link}"
+  value       = google_sql_database_instance.master.self_link
 }
 
 output "master_proxy_connection" {
@@ -38,27 +38,27 @@ output "master_proxy_connection" {
 
 output "master_ca_cert" {
   description = "The CA Certificate used to connect to the master instance via SSL"
-  value       = "${google_sql_database_instance.master.server_ca_cert.0.cert}"
+  value       = google_sql_database_instance.master.server_ca_cert.0.cert
 }
 
 output "master_ca_cert_common_name" {
   description = "The CN valid for the master instance CA Cert"
-  value       = "${google_sql_database_instance.master.server_ca_cert.0.common_name}"
+  value       = google_sql_database_instance.master.server_ca_cert.0.common_name
 }
 
 output "master_ca_cert_create_time" {
   description = "Creation time of the master instance CA Cert"
-  value       = "${google_sql_database_instance.master.server_ca_cert.0.create_time}"
+  value       = google_sql_database_instance.master.server_ca_cert.0.create_time
 }
 
 output "master_ca_cert_expiration_time" {
   description = "Expiration time of the master instance CA Cert"
-  value       = "${google_sql_database_instance.master.server_ca_cert.0.expiration_time}"
+  value       = google_sql_database_instance.master.server_ca_cert.0.expiration_time
 }
 
 output "master_ca_cert_sha1_fingerprint" {
   description = "SHA Fingerprint of the master instance CA Cert"
-  value       = "${google_sql_database_instance.master.server_ca_cert.0.sha1_fingerprint}"
+  value       = google_sql_database_instance.master.server_ca_cert.0.sha1_fingerprint
 }
 
 # ------------------------------------------------------------------------------
@@ -67,12 +67,12 @@ output "master_ca_cert_sha1_fingerprint" {
 
 output "db" {
   description = "Self link to the default database"
-  value       = "${google_sql_database.default.self_link}"
+  value       = google_sql_database.default.self_link
 }
 
 output "db_name" {
   description = "Name of the default database"
-  value       = "${google_sql_database.default.name}"
+  value       = google_sql_database.default.name
 }
 
 # ------------------------------------------------------------------------------
@@ -81,32 +81,32 @@ output "db_name" {
 
 output "failover_instance_name" {
   description = "The name of the failover database instance"
-  value       = "${join("", google_sql_database_instance.failover_replica.*.name)}"
+  value       = join("", google_sql_database_instance.failover_replica.*.name)
 }
 
 output "failover_public_ip_address" {
   description = "The public IPv4 address of the failover instance."
-  value       = "${join("", google_sql_database_instance.failover_replica.*.public_ip_address)}"
+  value       = join("", google_sql_database_instance.failover_replica.*.public_ip_address)
 }
 
 output "failover_private_ip_address" {
   description = "The private IPv4 address of the failover instance."
-  value       = "${join("", google_sql_database_instance.failover_replica.*.private_ip_address)}"
+  value       = join("", google_sql_database_instance.failover_replica.*.private_ip_address)
 }
 
 output "failover_ip_addresses" {
   description = "All IP addresses of the failover instance JSON encoded, see https://www.terraform.io/docs/providers/google/r/sql_database_instance.html#ip_address-0-ip_address"
-  value       = "${jsonencode(google_sql_database_instance.failover_replica.*.ip_address)}"
+  value       = jsonencode(google_sql_database_instance.failover_replica.*.ip_address)
 }
 
 output "failover_instance" {
   description = "Self link to the failover instance"
-  value       = "${join("", google_sql_database_instance.failover_replica.*.self_link)}"
+  value       = join("", google_sql_database_instance.failover_replica.*.self_link)
 }
 
 output "failover_proxy_connection" {
   description = "Failover instance path for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = "${local.failover_proxy_connection}"
+  value       = local.failover_proxy_connection
 }
 
 # ------------------------------------------------------------------------------
@@ -115,27 +115,27 @@ output "failover_proxy_connection" {
 
 output "failover_replica_ca_cert" {
   description = "The CA Certificate used to connect to the failover instance via SSL"
-  value       = "${local.failover_certificate}"
+  value       = local.failover_certificate
 }
 
 output "failover_replica_ca_cert_common_name" {
   description = "The CN valid for the failover instance CA Cert"
-  value       = "${local.failover_certificate_common_name}"
+  value       = local.failover_certificate_common_name
 }
 
 output "failover_replica_ca_cert_create_time" {
   description = "Creation time of the failover instance CA Cert"
-  value       = "${local.failover_certificate_create_time}"
+  value       = local.failover_certificate_create_time
 }
 
 output "failover_replica_ca_cert_expiration_time" {
   description = "Expiration time of the failover instance CA Cert"
-  value       = "${local.failover_certificate_expiration_time}"
+  value       = local.failover_certificate_expiration_time
 }
 
 output "failover_replica_ca_cert_sha1_fingerprint" {
   description = "SHA Fingerprint of the failover instance CA Cert"
-  value       = "${local.failover_certificate_sha1_fingerprint}"
+  value       = local.failover_certificate_sha1_fingerprint
 }
 
 # ------------------------------------------------------------------------------
@@ -144,37 +144,37 @@ output "failover_replica_ca_cert_sha1_fingerprint" {
 
 output "read_replica_instance_names" {
   description = "List of names for the read replica instances"
-  value       = ["${google_sql_database_instance.read_replica.*.name}"]
+  value       = google_sql_database_instance.read_replica.*.name
 }
 
 output "read_replica_ip_addresses" {
   description = "All IP addresses of the read replica instances JSON encoded, see https://www.terraform.io/docs/providers/google/r/sql_database_instance.html#ip_address-0-ip_address"
-  value       = "${jsonencode(google_sql_database_instance.read_replica.*.ip_address)}"
+  value       = jsonencode(google_sql_database_instance.read_replica.*.ip_address)
 }
 
 output "read_replica_public_ip_addresses" {
   description = "List of public IPv4 addresses of the read replica instances."
-  value       = ["${google_sql_database_instance.read_replica.*.public_ip_address}"]
+  value       = google_sql_database_instance.read_replica.*.public_ip_address
 }
 
 output "read_replica_private_ip_addresses" {
   description = "List of private IPv4 addresses of the read replica instances."
-  value       = ["${google_sql_database_instance.read_replica.*.private_ip_address}"]
+  value       = google_sql_database_instance.read_replica.*.private_ip_address
 }
 
 output "read_replica_instances" {
   description = "List of self links to the read replica instances"
-  value       = ["${google_sql_database_instance.read_replica.*.self_link}"]
+  value       = google_sql_database_instance.read_replica.*.self_link
 }
 
 output "read_replica_proxy_connections" {
   description = "List of read replica instance paths for connecting with Cloud SQL Proxy. Read more at https://cloud.google.com/sql/docs/mysql/sql-proxy"
-  value       = ["${data.template_file.read_replica_proxy_connection.*.rendered}"]
+  value       = data.template_file.read_replica_proxy_connection.*.rendered
 }
 
 output "read_replica_server_ca_certs" {
   description = "JSON encoded list of CA Certificates used to connect to the read replica instances via SSL"
-  value       = "${jsonencode(google_sql_database_instance.read_replica.*.server_ca_cert)}"
+  value       = jsonencode(google_sql_database_instance.read_replica.*.server_ca_cert)
 }
 
 # ------------------------------------------------------------------------------
@@ -183,5 +183,10 @@ output "read_replica_server_ca_certs" {
 
 output "complete" {
   description = "Output signaling that all resources have been created"
-  value       = "${data.template_file.complete.rendered}"
+  value       = data.template_file.complete.rendered
+}
+
+output "service_account_email_address" {
+  description = "Service account email address associated with the CloudSQL instance"
+  value       = google_sql_database_instance.master.service_account_email_address
 }

modules/cloud-sql/variables.tf

@@ -5,34 +5,42 @@
 
 variable "project" {
   description = "The project ID to host the database in."
+  type        = string
 }
 
 variable "region" {
   description = "The region to host the database in."
+  type        = string
 }
 
 variable "name" {
   description = "The name of the database instance. Note, after a name is used, it cannot be reused for up to one week. Use lowercase letters, numbers, and hyphens. Start with a letter."
+  type        = string
 }
 
 variable "engine" {
   description = "The engine version of the database, e.g. `MYSQL_5_6` or `MYSQL_5_7`. See https://cloud.google.com/sql/docs/features for supported versions."
+  type        = string
 }
 
 variable "machine_type" {
   description = "The machine type for the instances. See this page for supported tiers and pricing: https://cloud.google.com/sql/pricing"
+  type        = string
 }
 
 variable "db_name" {
   description = "Name of your database. Needs to follow MySQL identifier rules: https://dev.mysql.com/doc/refman/5.7/en/identifiers.html"
+  type        = string
 }
 
 variable "master_user_name" {
   description = "The username part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_name so you don't check it into source control."
+  type        = string
 }
 
 variable "master_user_password" {
   description = "The password part for the default user credentials, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. This should typically be set as the environment variable TF_VAR_master_user_password so you don't check it into source control."
+  type        = string
 }
 
 # ---------------------------------------------------------------------------------------------------------------------
@@ -42,12 +50,13 @@ variable "master_user_password" {
 
 variable "activation_policy" {
   description = "This specifies when the instance should be active. Can be either `ALWAYS`, `NEVER` or `ON_DEMAND`."
+  type        = string
   default     = "ALWAYS"
 }
 
 variable "authorized_networks" {
   description = "A list of authorized CIDR-formatted IP address ranges that can connect to this DB. Only applies to public IP instances."
-  type        = "list"
+  type        = list(map(string))
   default     = []
 
   # Example:
@@ -62,53 +71,67 @@ variable "authorized_networks" {
 
 variable "authorized_gae_applications" {
   description = "A list of Google App Engine (GAE) project names that are allowed to access this instance."
-  type        = "list"
+  type        = list(string)
   default     = []
 }
 
 variable "backup_enabled" {
   description = "Set to false if you want to disable backup."
+  type        = bool
   default     = true
 }
 
 variable "backup_start_time" {
   description = "HH:MM format (e.g. 04:00) time indicating when backup configuration starts. NOTE: Start time is randomly assigned if backup is enabled and 'backup_start_time' is not set"
+  type        = string
   default     = "04:00"
 }
 
+variable "point_in_time_recovery_enabled" {
+  description = "Will restart database if enabled after instance creation. Valid only for PostgreSQL instances."
+  type        = bool
+  default     = false
+}
+
 variable "mysql_binary_log_enabled" {
   description = "Set to false if you want to disable binary logs - only applicable to MySQL. Note, when using failover or read replicas, master and existing backups need to have binary_log_enabled=true set."
+  type        = bool
   default     = true
 }
 
 variable "maintenance_window_day" {
   description = "Day of week (1-7), starting on Monday, on which system maintenance can occur. Performance may be degraded or there may even be a downtime during maintenance windows."
+  type        = number
   default     = 7
 }
 
 variable "maintenance_window_hour" {
   description = "Hour of day (0-23) on which system maintenance can occur. Ignored if 'maintenance_window_day' not set. Performance may be degraded or there may even be a downtime during maintenance windows."
+  type        = number
   default     = 7
 }
 
 variable "maintenance_track" {
   description = "Receive updates earlier (canary) or later (stable)."
+  type        = string
   default     = "stable"
 }
 
 variable "db_charset" {
   description = "The charset for the default database."
-  default     = ""
+  type        = string
+  default     = null
 }
 
 variable "db_collation" {
   description = "The collation for the default database. Example for MySQL databases: 'utf8_general_ci'."
-  default     = ""
+  type        = string
+  default     = null
 }
 
 variable "database_flags" {
   description = "List of Cloud SQL flags that are applied to the database server"
-  type        = "list"
+  type        = list(any)
   default     = []
 
   # Example:
@@ -127,68 +150,80 @@ variable "database_flags" {
 
 variable "disk_autoresize" {
   description = "Second Generation only. Configuration to increase storage size automatically."
+  type        = bool
   default     = true
 }
 
 variable "disk_size" {
   description = "Second generation only. The size of data disk, in GB. Size of a running instance cannot be reduced but can be increased."
+  type        = number
   default     = 10
 }
 
 variable "disk_type" {
   description = "The type of storage to use. Must be one of `PD_SSD` or `PD_HDD`."
+  type        = string
   default     = "PD_SSD"
 }
 
 variable "follow_gae_application" {
   description = "A GAE application whose zone to remain in. Must be in the same region as this instance."
-  default     = ""
+  type        = string
+  default     = null
 }
 
 variable "master_zone" {
-  description = "Preferred zone for the master instance (e.g. 'us-central1-a'). 'region'. If empty, Google will auto-assign a zone."
-  default     = ""
+  description = "Preferred zone for the master instance (e.g. 'us-central1-a'). 'region'. If null, Google will auto-assign a zone."
+  type        = string
+  default     = null
 }
 
 variable "master_user_host" {
-  description = "The host part for the default user, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password' "
+  description = "The host part for the default user, i.e. 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'. Don't set this field for Postgres instances."
+  type        = string
   default     = "%"
 }
 
 # In nearly all cases, databases should NOT be publicly accessible, however if you're migrating from a PAAS provider like Heroku to GCP, this needs to remain open to the internet.
 variable "enable_public_internet_access" {
   description = "WARNING: - In nearly all cases a database should NOT be publicly accessible. Only set this to true if you want the database open to the internet."
+  type        = bool
   default     = false
 }
 
 variable "enable_failover_replica" {
   description = "Set to true to enable failover replica."
+  type        = bool
   default     = false
 }
 
 variable "mysql_failover_replica_zone" {
   description = "The preferred zone for the failover instance (e.g. 'us-central1-b'). Must be different than 'master_zone'. Only applicable to MySQL, Postgres will determine this automatically."
-  default     = ""
+  type        = string
+  default     = null
 }
 
 variable "require_ssl" {
   description = "True if the instance should require SSL/TLS for users connecting over IP. Note: SSL/TLS is needed to provide security when you connect to Cloud SQL using IP addresses. If you are connecting to your instance only by using the Cloud SQL Proxy or the Java Socket Library, you do not need to configure your instance to use SSL/TLS."
+  type        = bool
   default     = false
 }
 
 variable "private_network" {
   description = "The resource link for the VPC network from which the Cloud SQL instance is accessible for private IP."
-  default     = ""
+  type        = string
+  default     = null
 }
 
 variable "num_read_replicas" {
   description = "The number of read replicas to create. Cloud SQL will replicate all data from the master to these replicas, which you can use to horizontally scale read traffic."
+  type        = number
   default     = 0
 }
 
 variable "read_replica_zones" {
   description = "A list of compute zones where read replicas should be created. List size should match 'num_read_replicas'"
-  type        = "list"
+  type        = list(string)
   default     = []
 
   # Example:
@@ -197,7 +232,7 @@ variable "read_replica_zones" {
 
 variable "custom_labels" {
   description = "A map of custom labels to apply to the instance. The key is the label name and the value is the label value."
-  type        = "map"
+  type        = map(string)
   default     = {}
 }
 
@@ -205,6 +240,7 @@ variable "custom_labels" {
 # to not have the operations time out.
 variable "resource_timeout" {
   description = "Timeout for creating, updating and deleting database instances. Valid units of time are s, m, h."
+  type        = string
   default     = "60m"
 }
 
@@ -214,11 +250,11 @@ variable "resource_timeout" {
 # See https://github.com/hashicorp/terraform/issues/1178 for more details.
 # This can be used to make sure the module resources are created after other bootstrapping resources have been created.
 # For example:
-# dependencies = ["${google_service_networking_connection.private_vpc_connection.network}"]
+# dependencies = [google_service_networking_connection.private_vpc_connection.network]
 # ---------------------------------------------------------------------------------------------------------------------
 
 variable "dependencies" {
   description = "Create a dependency between the resources in this module to the interpolated values in this list (and thus the source resources). In other words, the resources in this module will now depend on the resources backing the values in this list such that those resources need to be created before the resources in this module, and the resources in this module need to be destroyed before the resources in the list."
-  type        = "list"
+  type        = list(string)
   default     = []
 }

test/Gopkg.lock

@@ -1,439 +0,0 @@
-# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
-
-
-[[projects]]
-  digest = "1:8b95956b70e181b19025c7ba3578fdfd8efbec4ce916490700488afb9218972c"
-  name = "cloud.google.com/go"
-  packages = [
-    "compute/metadata",
-    "iam",
-    "internal",
-    "internal/optional",
-    "internal/trace",
-    "internal/version",
-    "storage",
-  ]
-  pruneopts = ""
-  revision = "64a2037ec6be8a4b0c1d1f706ed35b428b989239"
-  version = "v0.26.0"
-
-[[projects]]
-  digest = "1:5204bbf2acdc60904e9ed06b4364810bd8b16e2cd48e4c5cbb242c52d6fa1d5f"
-  name = "github.com/GoogleCloudPlatform/cloudsql-proxy"
-  packages = [
-    "logging",
-    "proxy/certs",
-    "proxy/dialers/mysql",
-    "proxy/dialers/postgres",
-    "proxy/proxy",
-    "proxy/util",
-  ]
-  pruneopts = ""
-  revision = "ac834ce67862b7c4ed8bdbe86e664572f820c245"
-  version = "1.13"
-
-[[projects]]
-  digest = "1:4b6ba994aa18b6c6a871cd700a66525a182f2c0cd78022e25e01508fc8559122"
-  name = "github.com/aws/aws-sdk-go"
-  packages = [
-    "aws",
-    "aws/awserr",
-    "aws/awsutil",
-    "aws/client",
-    "aws/client/metadata",
-    "aws/corehandlers",
-    "aws/credentials",
-    "aws/credentials/ec2rolecreds",
-    "aws/credentials/endpointcreds",
-    "aws/credentials/processcreds",
-    "aws/credentials/stscreds",
-    "aws/csm",
-    "aws/defaults",
-    "aws/ec2metadata",
-    "aws/endpoints",
-    "aws/request",
-    "aws/session",
-    "aws/signer/v4",
-    "internal/ini",
-    "internal/s3err",
-    "internal/sdkio",
-    "internal/sdkrand",
-    "internal/sdkuri",
-    "internal/shareddefaults",
-    "private/protocol",
-    "private/protocol/ec2query",
-    "private/protocol/eventstream",
-    "private/protocol/eventstream/eventstreamapi",
-    "private/protocol/json/jsonutil",
-    "private/protocol/jsonrpc",
-    "private/protocol/query",
-    "private/protocol/query/queryutil",
-    "private/protocol/rest",
-    "private/protocol/restxml",
-    "private/protocol/xml/xmlutil",
-    "service/acm",
-    "service/autoscaling",
-    "service/cloudwatchlogs",
-    "service/ec2",
-    "service/iam",
-    "service/kms",
-    "service/rds",
-    "service/s3",
-    "service/s3/s3iface",
-    "service/s3/s3manager",
-    "service/sns",
-    "service/sqs",
-    "service/sts",
-  ]
-  pruneopts = ""
-  revision = "949cbce4e4443b72f6da12adbeb5d416dd506fbe"
-  version = "v1.16.27"
-
-[[projects]]
-  digest = "1:b529f4bf748979caa18b599d40d13e8b6e591a74b340f315ce4f95e119c288c2"
-  name = "github.com/boombuler/barcode"
-  packages = [
-    ".",
-    "qr",
-    "utils",
-  ]
-  pruneopts = ""
-  revision = "3cfea5ab600ae37946be2b763b8ec2c1cf2d272d"
-  version = "v1.0.0"
-
-[[projects]]
-  digest = "1:0deddd908b6b4b768cfc272c16ee61e7088a60f7fe2f06c547bd3d8e1f8b8e77"
-  name = "github.com/davecgh/go-spew"
-  packages = ["spew"]
-  pruneopts = ""
-  revision = "8991bc29aa16c548c550c7ff78260e27b9ab7c73"
-  version = "v1.1.1"
-
-[[projects]]
-  digest = "1:e692d16fdfbddb94e9e4886aaf6c08bdbae5cb4ac80651445de9181b371c6e46"
-  name = "github.com/go-sql-driver/mysql"
-  packages = ["."]
-  pruneopts = ""
-  revision = "72cd26f257d44c1114970e19afddcd812016007e"
-  source = "git@github.com:go-sql-driver/mysql"
-  version = "v1.4.1"
-
-[[projects]]
-  digest = "1:3dd078fda7500c341bc26cfbc6c6a34614f295a2457149fc1045cab767cbcf18"
-  name = "github.com/golang/protobuf"
-  packages = [
-    "proto",
-    "protoc-gen-go/descriptor",
-    "ptypes",
-    "ptypes/any",
-    "ptypes/duration",
-    "ptypes/timestamp",
-  ]
-  pruneopts = ""
-  revision = "aa810b61a9c79d51363740d207bb46cf8e620ed5"
-  version = "v1.2.0"
-
-[[projects]]
-  digest = "1:c1d7e883c50a26ea34019320d8ae40fad86c9e5d56e63a1ba2cb618cef43e986"
-  name = "github.com/google/uuid"
-  packages = ["."]
-  pruneopts = ""
-  revision = "064e2069ce9c359c118179501254f67d7d37ba24"
-  version = "0.2"
-
-[[projects]]
-  digest = "1:55c1b46a80db2baf4d762c1d0b5cb4946e46125baa02b8959310abab15b54aee"
-  name = "github.com/googleapis/gax-go"
-  packages = [
-    ".",
-    "v2",
-  ]
-  pruneopts = ""
-  revision = "c8a15bac9b9fe955bd9f900272f9a306465d28cf"
-  version = "v2.0.3"
-
-[[projects]]
-  digest = "1:4b6c36dd91add683751cb4670cc26d63c7e7db259695ffd723670c666797c62c"
-  name = "github.com/gruntwork-io/terratest"
-  packages = [
-    "modules/aws",
-    "modules/collections",
-    "modules/customerrors",
-    "modules/environment",
-    "modules/files",
-    "modules/gcp",
-    "modules/logger",
-    "modules/packer",
-    "modules/random",
-    "modules/retry",
-    "modules/shell",
-    "modules/ssh",
-    "modules/terraform",
-    "modules/test-structure",
-  ]
-  pruneopts = ""
-  revision = "425f7f1c2c72c607142c67aee02d1c14f874cf0a"
-  source = "git@github.com:gruntwork-io/terratest"
-  version = "v0.13.24"
-
-[[projects]]
-  digest = "1:13fe471d0ed891e8544eddfeeb0471fd3c9f2015609a1c000aefdedf52a19d40"
-  name = "github.com/jmespath/go-jmespath"
-  packages = ["."]
-  pruneopts = ""
-  revision = "c2b33e84"
-
-[[projects]]
-  digest = "1:29145d7af4adafd72a79df5e41456ac9e232d5a28c1cd4dacf3ff008a217fc10"
-  name = "github.com/lib/pq"
-  packages = [
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-    "oid",
-  ]
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-
-[[projects]]
-  digest = "1:256484dbbcd271f9ecebc6795b2df8cad4c458dd0f5fd82a8c2fa0c29f233411"
-  name = "github.com/pmezard/go-difflib"
-  packages = ["difflib"]
-  pruneopts = ""
-  revision = "792786c7400a136282c1664665ae0a8db921c6c2"
-  version = "v1.0.0"
-
-[[projects]]
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-  name = "github.com/pquerna/otp"
-  packages = [
-    ".",
-    "hotp",
-    "totp",
-  ]
-  pruneopts = ""
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-
-[[projects]]
-  digest = "1:381bcbeb112a51493d9d998bbba207a529c73dbb49b3fd789e48c63fac1f192c"
-  name = "github.com/stretchr/testify"
-  packages = [
-    "assert",
-    "require",
-  ]
-  pruneopts = ""
-  revision = "ffdc059bfe9ce6a4e144ba849dbedead332c6053"
-  version = "v1.3.0"
-
-[[projects]]
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-  name = "go.opencensus.io"
-  packages = [
-    ".",
-    "exemplar",
-    "internal",
-    "internal/tagencoding",
-    "plugin/ochttp",
-    "plugin/ochttp/propagation/b3",
-    "stats",
-    "stats/internal",
-    "stats/view",
-    "tag",
-    "trace",
-    "trace/internal",
-    "trace/propagation",
-    "trace/tracestate",
-  ]
-  pruneopts = ""
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-  name = "golang.org/x/crypto"
-  packages = [
-    "curve25519",
-    "ed25519",
-    "ed25519/internal/edwards25519",
-    "internal/chacha20",
-    "internal/subtle",
-    "poly1305",
-    "ssh",
-    "ssh/agent",
-  ]
-  pruneopts = ""
-  revision = "b8fe1690c61389d7d2a8074a507d1d40c5d30448"
-
-[[projects]]
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-  name = "golang.org/x/net"
-  packages = [
-    "context",
-    "context/ctxhttp",
-    "http/httpguts",
-    "http2",
-    "http2/hpack",
-    "idna",
-    "internal/timeseries",
-    "trace",
-  ]
-  pruneopts = ""
-  revision = "d26f9f9a57f3fab6a695bec0d84433c2c50f8bbf"
-
-[[projects]]
-  digest = "1:b697592485cb412be4188c08ca0beed9aab87f36b86418e21acc4a3998f63734"
-  name = "golang.org/x/oauth2"
-  packages = [
-    ".",
-    "google",
-    "internal",
-    "jws",
-    "jwt",
-  ]
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-[[projects]]
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-  name = "golang.org/x/sys"
-  packages = ["unix"]
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-[[projects]]
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-  name = "golang.org/x/text"
-  packages = [
-    "collate",
-    "collate/build",
-    "internal/colltab",
-    "internal/gen",
-    "internal/tag",
-    "internal/triegen",
-    "internal/ucd",
-    "language",
-    "secure/bidirule",
-    "transform",
-    "unicode/bidi",
-    "unicode/cldr",
-    "unicode/norm",
-    "unicode/rangetable",
-  ]
-  pruneopts = ""
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-  version = "v0.3.0"
-
-[[projects]]
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-  name = "google.golang.org/api"
-  packages = [
-    "compute/v1",
-    "gensupport",
-    "googleapi",
-    "googleapi/internal/uritemplates",
-    "googleapi/transport",
-    "internal",
-    "iterator",
-    "option",
-    "sqladmin/v1beta4",
-    "storage/v1",
-    "transport/http",
-    "transport/http/internal/propagation",
-  ]
-  pruneopts = ""
-  revision = "697424a9b4245c525a11d14a2460c76f35f8db55"
-
-[[projects]]
-  digest = "1:bc09e719c4e2a15d17163f5272d9a3131c45d77542b7fdc53ff518815bc19ab3"
-  name = "google.golang.org/appengine"
-  packages = [
-    ".",
-    "cloudsql",
-    "internal",
-    "internal/app_identity",
-    "internal/base",
-    "internal/datastore",
-    "internal/log",
-    "internal/modules",
-    "internal/remote_api",
-    "internal/urlfetch",
-    "urlfetch",
-  ]
-  pruneopts = ""
-  revision = "e9657d882bb81064595ca3b56cbe2546bbabf7b1"
-  version = "v1.4.0"
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-[[projects]]
-  branch = "master"
-  digest = "1:91f75dc679abcf04b29b064a5b9c40a0b0561c86c322010fbf6fc08040cc48bc"
-  name = "google.golang.org/genproto"
-  packages = [
-    "googleapis/api/annotations",
-    "googleapis/iam/v1",
-    "googleapis/rpc/code",
-    "googleapis/rpc/status",
-  ]
-  pruneopts = ""
-  revision = "4b09977fb92221987e99d190c8f88f2c92727a29"
-
-[[projects]]
-  digest = "1:39d4d828b87d58d114fdc211f0638f32dcae84019fe17d6b48f9b697f4b60213"
-  name = "google.golang.org/grpc"
-  packages = [
-    ".",
-    "balancer",
-    "balancer/base",
-    "balancer/roundrobin",
-    "binarylog/grpc_binarylog_v1",
-    "codes",
-    "connectivity",
-    "credentials",
-    "credentials/internal",
-    "encoding",
-    "encoding/proto",
-    "grpclog",
-    "internal",
-    "internal/backoff",
-    "internal/binarylog",
-    "internal/channelz",
-    "internal/envconfig",
-    "internal/grpcrand",
-    "internal/grpcsync",
-    "internal/syscall",
-    "internal/transport",
-    "keepalive",
-    "metadata",
-    "naming",
-    "peer",
-    "resolver",
-    "resolver/dns",
-    "resolver/passthrough",
-    "stats",
-    "status",
-    "tap",
-  ]
-  pruneopts = ""
-  revision = "a02b0774206b209466313a0b525d2c738fe407eb"
-  version = "v1.18.0"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  input-imports = [
-    "github.com/GoogleCloudPlatform/cloudsql-proxy/proxy/dialers/mysql",
-    "github.com/GoogleCloudPlatform/cloudsql-proxy/proxy/dialers/postgres",
-    "github.com/go-sql-driver/mysql",
-    "github.com/gruntwork-io/terratest/modules/gcp",
-    "github.com/gruntwork-io/terratest/modules/logger",
-    "github.com/gruntwork-io/terratest/modules/terraform",
-    "github.com/gruntwork-io/terratest/modules/test-structure",
-    "github.com/lib/pq",
-    "github.com/stretchr/testify/assert",
-    "github.com/stretchr/testify/require",
-  ]
-  solver-name = "gps-cdcl"
-  solver-version = 1

test/Gopkg.toml

@@ -1,30 +0,0 @@
-# Gopkg.toml example
-#
-# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#  name = "github.com/x/y"
-#  version = "2.4.0"
-
-[[constraint]]
-  name = "github.com/gruntwork-io/terratest"
-  source = "git@github.com:gruntwork-io/terratest"
-  version = "0.13.24"
-
-[[constraint]]
-  name = "github.com/go-sql-driver/mysql"
-  source = "git@github.com:go-sql-driver/mysql"
-  version = "1.4.1"

test/example_mysql_private_ip_test.go

@@ -2,13 +2,14 @@ package test
 
 import (
 	"fmt"
-	"github.com/gruntwork-io/terratest/modules/gcp"
-	"github.com/gruntwork-io/terratest/modules/terraform"
-	"github.com/gruntwork-io/terratest/modules/test-structure"
-	"github.com/stretchr/testify/assert"
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"github.com/gruntwork-io/terratest/modules/gcp"
+	"github.com/gruntwork-io/terratest/modules/terraform"
+	test_structure "github.com/gruntwork-io/terratest/modules/test-structure"
+	"github.com/stretchr/testify/assert"
 )
 
 const NAME_PREFIX_PRIVATE = "mysql-private"
@@ -42,7 +43,7 @@ func TestMySqlPrivateIP(t *testing.T) {
 	test_structure.RunTestStage(t, "deploy", func() {
 		region := test_structure.LoadString(t, exampleDir, KEY_REGION)
 		projectId := test_structure.LoadString(t, exampleDir, KEY_PROJECT)
-		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_PRIVATE, "", "", 0, "")
+		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_PRIVATE)
 		test_structure.SaveTerraformOptions(t, exampleDir, terraformOptions)
 
 		terraform.InitAndApply(t, terraformOptions)

test/example_mysql_public_ip_test.go

@@ -5,18 +5,19 @@ import (
 	"crypto/x509"
 	"database/sql"
 	"fmt"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
 	mydialer "github.com/GoogleCloudPlatform/cloudsql-proxy/proxy/dialers/mysql"
 	"github.com/go-sql-driver/mysql"
 	"github.com/gruntwork-io/terratest/modules/gcp"
 	"github.com/gruntwork-io/terratest/modules/logger"
 	"github.com/gruntwork-io/terratest/modules/terraform"
-	"github.com/gruntwork-io/terratest/modules/test-structure"
+	test_structure "github.com/gruntwork-io/terratest/modules/test-structure"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"path/filepath"
-	"strings"
-	"testing"
-	"time"
 )
 
 const NAME_PREFIX_PUBLIC = "mysql-public"
@@ -65,7 +66,7 @@ func TestMySqlPublicIP(t *testing.T) {
 	test_structure.RunTestStage(t, "deploy", func() {
 		region := test_structure.LoadString(t, exampleDir, KEY_REGION)
 		projectId := test_structure.LoadString(t, exampleDir, KEY_PROJECT)
-		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_PUBLIC, "", "", 0, "")
+		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_PUBLIC)
 		test_structure.SaveTerraformOptions(t, exampleDir, terraformOptions)
 
 		terraform.InitAndApply(t, terraformOptions)

test/example_mysql_replicas_test.go

@@ -3,15 +3,16 @@ package test
 import (
 	"database/sql"
 	"fmt"
-	"github.com/gruntwork-io/terratest/modules/gcp"
-	"github.com/gruntwork-io/terratest/modules/logger"
-	"github.com/gruntwork-io/terratest/modules/terraform"
-	"github.com/gruntwork-io/terratest/modules/test-structure"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"github.com/gruntwork-io/terratest/modules/gcp"
+	"github.com/gruntwork-io/terratest/modules/logger"
+	"github.com/gruntwork-io/terratest/modules/terraform"
+	test_structure "github.com/gruntwork-io/terratest/modules/test-structure"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 const NAME_PREFIX_REPLICAS = "mysql-replicas"
@@ -58,7 +59,7 @@ func TestMySqlReplicas(t *testing.T) {
 		masterZone := test_structure.LoadString(t, exampleDir, KEY_MASTER_ZONE)
 		failoverReplicaZone := test_structure.LoadString(t, exampleDir, KEY_FAILOVER_REPLICA_ZONE)
 		readReplicaZone := test_structure.LoadString(t, exampleDir, KEY_READ_REPLICA_ZONE)
-		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_REPLICAS, masterZone, failoverReplicaZone, 1, readReplicaZone)
+		terraformOptions := createTerratestOptionsForCloudSqlReplicas(projectId, region, exampleDir, NAME_PREFIX_REPLICAS, masterZone, failoverReplicaZone, 1, readReplicaZone)
 		test_structure.SaveTerraformOptions(t, exampleDir, terraformOptions)
 
 		terraform.InitAndApply(t, terraformOptions)

test/example_postgres_private_ip_test.go

@@ -2,13 +2,14 @@ package test
 
 import (
 	"fmt"
-	"github.com/gruntwork-io/terratest/modules/gcp"
-	"github.com/gruntwork-io/terratest/modules/terraform"
-	"github.com/gruntwork-io/terratest/modules/test-structure"
-	"github.com/stretchr/testify/assert"
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"github.com/gruntwork-io/terratest/modules/gcp"
+	"github.com/gruntwork-io/terratest/modules/terraform"
+	test_structure "github.com/gruntwork-io/terratest/modules/test-structure"
+	"github.com/stretchr/testify/assert"
 )
 
 const NAME_PREFIX_POSTGRES_PRIVATE = "postgres-private"
@@ -42,7 +43,7 @@ func TestPostgresPrivateIP(t *testing.T) {
 	test_structure.RunTestStage(t, "deploy", func() {
 		region := test_structure.LoadString(t, exampleDir, KEY_REGION)
 		projectId := test_structure.LoadString(t, exampleDir, KEY_PROJECT)
-		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_POSTGRES_PRIVATE, "", "", 0, "")
+		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_POSTGRES_PRIVATE)
 		test_structure.SaveTerraformOptions(t, exampleDir, terraformOptions)
 
 		terraform.InitAndApply(t, terraformOptions)

test/example_postgres_public_ip_test.go

@@ -3,18 +3,19 @@ package test
 import (
 	"database/sql"
 	"fmt"
-	_ "github.com/GoogleCloudPlatform/cloudsql-proxy/proxy/dialers/postgres"
-	"github.com/gruntwork-io/terratest/modules/gcp"
-	"github.com/gruntwork-io/terratest/modules/logger"
-	"github.com/gruntwork-io/terratest/modules/terraform"
-	"github.com/gruntwork-io/terratest/modules/test-structure"
-	_ "github.com/lib/pq"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 	"os"
 	"path/filepath"
 	"strings"
 	"testing"
+
+	_ "github.com/GoogleCloudPlatform/cloudsql-proxy/proxy/dialers/postgres"
+	"github.com/gruntwork-io/terratest/modules/gcp"
+	"github.com/gruntwork-io/terratest/modules/logger"
+	"github.com/gruntwork-io/terratest/modules/terraform"
+	test_structure "github.com/gruntwork-io/terratest/modules/test-structure"
+	_ "github.com/lib/pq"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 const NAME_PREFIX_POSTGRES_PUBLIC = "postgres-public"
@@ -62,7 +63,7 @@ func TestPostgresPublicIP(t *testing.T) {
 	test_structure.RunTestStage(t, "deploy", func() {
 		region := test_structure.LoadString(t, exampleDir, KEY_REGION)
 		projectId := test_structure.LoadString(t, exampleDir, KEY_PROJECT)
-		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_POSTGRES_PUBLIC, "", "", 0, "")
+		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_POSTGRES_PUBLIC)
 		test_structure.SaveTerraformOptions(t, exampleDir, terraformOptions)
 
 		terraform.InitAndApply(t, terraformOptions)
@@ -137,7 +138,7 @@ func TestPostgresPublicIP(t *testing.T) {
 		logger.Logf(t, "Connecting to: %s via Cloud SQL Proxy", proxyConn)
 
 		// Use the Cloud SQL Proxy for queries
-		// See https://cloud.google.com/sql/docs/mysql/sql-proxy
+		// See https://cloud.google.com/sql/docs/postgres/sql-proxy
 
 		// Note that sslmode=disable is required it does not mean that the connection
 		// is unencrypted. All connections via the proxy are completely encrypted.
@@ -245,5 +246,11 @@ func TestPostgresPublicIP(t *testing.T) {
 		if err = db.Ping(); err != nil {
 			t.Fatalf("Failed to ping DB with forced SSL: %v", err)
 		}
+
+		// Drop the test table if it exists
+		logger.Logf(t, "Drop table: %s", POSTGRES_DROP_TEST_TABLE)
+		if _, err = db.Exec(POSTGRES_DROP_TEST_TABLE); err != nil {
+			t.Fatalf("Failed to drop table: %v", err)
+		}
 	})
 }

test/example_postgres_replicas_test.go

@@ -3,16 +3,17 @@ package test
 import (
 	"database/sql"
 	"fmt"
-	"github.com/gruntwork-io/terratest/modules/gcp"
-	"github.com/gruntwork-io/terratest/modules/logger"
-	"github.com/gruntwork-io/terratest/modules/terraform"
-	"github.com/gruntwork-io/terratest/modules/test-structure"
-	_ "github.com/lib/pq"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
 	"path/filepath"
 	"strings"
 	"testing"
+
+	"github.com/gruntwork-io/terratest/modules/gcp"
+	"github.com/gruntwork-io/terratest/modules/logger"
+	"github.com/gruntwork-io/terratest/modules/terraform"
+	test_structure "github.com/gruntwork-io/terratest/modules/test-structure"
+	_ "github.com/lib/pq"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 const NAME_PREFIX_POSTGRES_REPLICAS = "postgres-replicas"
@@ -51,12 +52,35 @@ func TestPostgresReplicas(t *testing.T) {
 		terraform.Destroy(t, terraformOptions)
 	})
 
+	// AT THE END OF THE TESTS, CLEAN UP ANY POSTGRES OBJECTS THAT WERE CREATED
+	defer test_structure.RunTestStage(t, "cleanup_postgres_objects", func() {
+		terraformOptions := test_structure.LoadTerraformOptions(t, exampleDir)
+
+		publicIp := terraform.Output(t, terraformOptions, OUTPUT_MASTER_PUBLIC_IP)
+
+		connectionString := fmt.Sprintf("postgres://%s:%s@%s/%s?sslmode=disable", DB_USER, DB_PASS, publicIp, DB_NAME)
+
+		// Does not actually open up the connection - just returns a DB ref
+		logger.Logf(t, "Connecting to: %s", publicIp)
+		db, err := sql.Open("postgres", connectionString)
+		require.NoError(t, err, "Failed to open DB connection")
+
+		// Make sure we clean up properly
+		defer db.Close()
+
+		// Drop table if it exists
+		logger.Logf(t, "Drop table: %s", POSTGRES_DROP_TEST_TABLE)
+		if _, err = db.Exec(POSTGRES_DROP_TEST_TABLE); err != nil {
+			t.Fatalf("Failed to drop table: %v", err)
+		}
+	})
+
 	test_structure.RunTestStage(t, "deploy", func() {
 		region := test_structure.LoadString(t, exampleDir, KEY_REGION)
 		projectId := test_structure.LoadString(t, exampleDir, KEY_PROJECT)
 		masterZone := test_structure.LoadString(t, exampleDir, KEY_MASTER_ZONE)
 		readReplicaZone := test_structure.LoadString(t, exampleDir, KEY_READ_REPLICA_ZONE)
-		terraformOptions := createTerratestOptionsForCloudSql(projectId, region, exampleDir, NAME_PREFIX_POSTGRES_REPLICAS, masterZone, "", 1, readReplicaZone)
+		terraformOptions := createTerratestOptionsForCloudSqlReplicas(projectId, region, exampleDir, NAME_PREFIX_POSTGRES_REPLICAS, masterZone, "", 1, readReplicaZone)
 		test_structure.SaveTerraformOptions(t, exampleDir, terraformOptions)
 
 		terraform.InitAndApply(t, terraformOptions)

test/go.mod

@@ -0,0 +1,11 @@
+module github.com/gruntwork-io/terraform-google-sql/test
+
+go 1.14
+
+require (
+	github.com/GoogleCloudPlatform/cloudsql-proxy v0.0.0-20200504171905-7e668d9ad0ba
+	github.com/go-sql-driver/mysql v1.5.0
+	github.com/gruntwork-io/terratest v0.27.1
+	github.com/lib/pq v1.5.1
+	github.com/stretchr/testify v1.5.1
+)

test/go.sum

@@ -0,0 +1,692 @@
+bazil.org/fuse v0.0.0-20180421153158-65cc252bf669/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.51.0/go.mod h1:hWtGJ6gnXH+KgDv+V0zFGDvpi07n3z8ZNj3T1RW0Gcw=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
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+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
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test/test_util.go

@@ -1,12 +1,13 @@
 package test
 
 import (
-	"github.com/gruntwork-io/terratest/modules/gcp"
-	"github.com/gruntwork-io/terratest/modules/terraform"
-	"github.com/stretchr/testify/require"
 	"io/ioutil"
 	"os"
 	"testing"
+
+	"github.com/gruntwork-io/terratest/modules/gcp"
+	"github.com/gruntwork-io/terratest/modules/terraform"
+	"github.com/stretchr/testify/require"
 )
 
 const DB_NAME = "testdb"
@@ -43,6 +44,7 @@ const SQL_QUERY_ROW_COUNT = "SELECT count(*) FROM test"
 
 const POSTGRES_CREATE_TEST_TABLE_WITH_SERIAL = "CREATE TABLE IF NOT EXISTS test (id SERIAL, name varchar(10) NOT NULL, PRIMARY KEY (ID))"
 const POSTGRES_INSERT_TEST_ROW = "INSERT INTO test(name) VALUES('Grunty') RETURNING id"
+const POSTGRES_DROP_TEST_TABLE = "DROP TABLE IF EXISTS test"
 
 func getRandomRegion(t *testing.T, projectID string) string {
 	approvedRegions := []string{"europe-north1", "europe-west1", "europe-west2", "europe-west3", "us-central1", "us-east1", "us-west1"}
@@ -63,8 +65,24 @@ func getTwoDistinctRandomZonesForRegion(t *testing.T, projectID string, region s
 	return firstZone, secondZone
 }
 
-func createTerratestOptionsForCloudSql(projectId string, region string, exampleDir string, namePrefix string, masterZone string, failoverReplicaZone string, numReadReplicas int, readReplicaZone string) *terraform.Options {
+func createTerratestOptionsForCloudSql(projectId string, region string, exampleDir string, namePrefix string) *terraform.Options {
+	terratestOptions := &terraform.Options{
+		// The path to where your Terraform code is located
+		TerraformDir: exampleDir,
+		Vars: map[string]interface{}{
+			"region":               region,
+			"project":              projectId,
+			"name_prefix":          namePrefix,
+			"db_name":              DB_NAME,
+			"master_user_name":     DB_USER,
+			"master_user_password": DB_PASS,
+		},
+	}
 
+	return terratestOptions
+}
+
+func createTerratestOptionsForCloudSqlReplicas(projectId string, region string, exampleDir string, namePrefix string, masterZone string, failoverReplicaZone string, numReadReplicas int, readReplicaZone string) *terraform.Options {
 	terratestOptions := &terraform.Options{
 		// The path to where your Terraform code is located
 		TerraformDir: exampleDir,