opentf/website/docs/language/settings/backends/kubernetes.html.md

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language	Backend Type: Kubernetes	docs-backends-types-standard-kubernetes	Terraform can store state remotely in Kubernetes and lock that state.

kubernetes

-> Note: This backend is limited by Kubernetes' maximum Secret size of 1MB. See Secret restrictions for details.

Kind: Standard (with locking)

Stores the state in a Kubernetes secret with locking done using a Lease resource.

Example Configuration

terraform {
  backend "kubernetes" {
    secret_suffix    = "state"
    load_config_file = true
  }
}

This assumes the user/service account running terraform has permissions to read/write secrets in the namespace used to store the secret.

If the load_config_file flag is set the backend will attempt to use a kubeconfig file to gain access to the cluster.

If the in_cluster_config flag is set the backend will attempt to use a service account to access the cluster. This can be used if Terraform is being run from within a pod running in the Kubernetes cluster.

For most use cases either in_cluster_config or load_config_file will need to be set to true. If both flags are set the configuration from load_config_file will be used.

Note that for the access credentials we recommend using a partial configuration.

Example Referencing

data "terraform_remote_state" "foo" {
  backend = "kubernetes"
  config = {
    secret_suffix    = "state"
    load_config_file = true
  }
}

Configuration variables

The following configuration options are supported:

• secret_suffix - (Required) Suffix used when creating secrets. Secrets will be named in the format: tfstate-{workspace}-{secret_suffix}.
• labels - (Optional) Map of additional labels to be applied to the secret and lease.
• namespace - (Optional) Namespace to store the secret and lease in. Can be sourced from KUBE_NAMESPACE.
• in_cluster_config - (Optional) Used to authenticate to the cluster from inside a pod. Can be sourced from KUBE_IN_CLUSTER_CONFIG.
• load_config_file - (Optional) Use a kubeconfig file to access the cluster. Can be sourced from KUBE_LOAD_CONFIG_FILE.
• host - (Optional) The hostname (in form of URI) of Kubernetes master. Can be sourced from KUBE_HOST. Defaults to https://localhost.
• username - (Optional) The username to use for HTTP basic authentication when accessing the Kubernetes master endpoint. Can be sourced from KUBE_USER.
• password - (Optional) The password to use for HTTP basic authentication when accessing the Kubernetes master endpoint. Can be sourced from KUBE_PASSWORD.
• insecure - (Optional) Whether server should be accessed without verifying the TLS certificate. Can be sourced from KUBE_INSECURE. Defaults to false.
• client_certificate - (Optional) PEM-encoded client certificate for TLS authentication. Can be sourced from KUBE_CLIENT_CERT_DATA.
• client_key - (Optional) PEM-encoded client certificate key for TLS authentication. Can be sourced from KUBE_CLIENT_KEY_DATA.
• cluster_ca_certificate - (Optional) PEM-encoded root certificates bundle for TLS authentication. Can be sourced from KUBE_CLUSTER_CA_CERT_DATA.
• config_path - (Optional) Path to the kube config file. Can be sourced from KUBE_CONFIG or KUBECONFIG. Defaults to ~/.kube/config.
• config_context - (Optional) Context to choose from the config file. Can be sourced from KUBE_CTX.
• config_context_auth_info - (Optional) Authentication info context of the kube config (name of the kubeconfig user, --user flag in kubectl). Can be sourced from KUBE_CTX_AUTH_INFO.
• config_context_cluster - (Optional) Cluster context of the kube config (name of the kubeconfig cluster, --cluster flag in kubectl). Can be sourced from KUBE_CTX_CLUSTER.
• token - (Optional) Token of your service account. Can be sourced from KUBE_TOKEN.
• exec - (Optional) Configuration block to use an [exec-based credential plugin] (https://kubernetes.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins), e.g. call an external command to receive user credentials.
  • api_version - (Required) API version to use when decoding the ExecCredentials resource, e.g. client.authentication.k8s.io/v1beta1.
  • command - (Required) Command to execute.
  • args - (Optional) List of arguments to pass when executing the plugin.
  • env - (Optional) Map of environment variables to set when executing the plugin.