Initial failover implementation

examples/mysql-replicas/main.tf

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+# ------------------------------------------------------------------------------
+# LAUNCH A MYSQL CLUSTER WITH FAILOVER AND READ REPLICAS
+# ------------------------------------------------------------------------------
+
+# ------------------------------------------------------------------------------
+# CONFIGURE OUR GCP CONNECTION
+# ------------------------------------------------------------------------------
+
+provider "google-beta" {
+  region  = "${var.region}"
+  project = "${var.project}"
+}
+
+# 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"
+}
+
+# ------------------------------------------------------------------------------
+# CREATE A RANDOM SUFFIX AND PREPARE RESOURCE NAMES
+# ------------------------------------------------------------------------------
+
+resource "random_id" "name" {
+  byte_length = 2
+}
+
+locals {
+  # If name_override is specified, use that - otherwise use the name_prefix with a random string
+  instance_name        = "${length(var.name_override) == 0 ? format("%s-%s", var.name_prefix, random_id.name.hex) : var.name_override}"
+  private_network_name = "private-network-${random_id.name.hex}"
+  private_ip_name      = "private-ip-${random_id.name.hex}"
+}
+
+# ------------------------------------------------------------------------------
+# CREATE DATABASE CLUSTER WITH PUBLIC IP
+# ------------------------------------------------------------------------------
+
+module "mysql" {
+  # When using these modules in your own templates, you will need to use a Git URL with a ref attribute that pins you
+  # to a specific version of the modules, such as the following example:
+  # source = "git::git@github.com:gruntwork-io/terraform-google-sql.git//modules/mysql?ref=v0.1.0"
+  source = "../../modules/mysql"
+
+  project = "${var.project}"
+  region  = "${var.region}"
+  name    = "${local.instance_name}"
+  db_name = "${var.db_name}"
+
+  engine       = "${var.mysql_version}"
+  machine_type = "${var.machine_type}"
+
+  master_zone = "a"
+
+  enable_public_internet_access = true
+  enable_failover_replica       = true
+  failover_replica_zone         = "b"
+
+  # These together will construct the master_user privileges, i.e.
+  # 'master_user_name'@'master_user_host' IDENTIFIED BY 'master_user_password'.
+  # These should typically be set as the environment variable TF_VAR_master_user_password, etc.
+  # so you don't check these into source control."
+  master_user_password = "${var.master_user_password}"
+
+  master_user_name = "${var.master_user_name}"
+  master_user_host = "%"
+
+  # Set auto-increment flags to test the
+  # feature during automated testing
+  database_flags = [
+    {
+      name  = "auto_increment_increment"
+      value = "7"
+    },
+    {
+      name  = "auto_increment_offset"
+      value = "7"
+    },
+  ]
+
+  custom_labels = {
+    test-id = "mysql-replicas-example"
+  }
+}