iq-scm / provider-terraform

A @crossplane provider for Terraform

Official Terraform Provider

Provider Terraform is a Crossplane provider that can run Terraform code and enables defining new Crossplane Composite Resources (XRs) that are composed of a mix of 'native' Crossplane managed resources and your existing Terraform modules.

The Terraform provider adds support for a Workspace managed resource that represents a Terraform workspace. The configuration of each workspace may be either fetched from a remote source (e.g. git), or simply specified inline.

apiVersion: tf.upbound.io/v1beta1
kind: Workspace
metadata:
  name: example-inline
  annotations:
    # The terraform workspace will be named 'coolbucket'. If you omitted this
    # annotation it would be derived from metadata.name - i.e. 'example-inline'.
    crossplane.io/external-name: coolbucket
spec:
  forProvider:
    # For simple cases you can use an inline source to specify the content of
    # main.tf as opaque, inline HCL.
    source: Inline
    module: |
      // All outputs are written to the connection secret.  Non-sensitive outputs
      // are stored as string values in the status.atProvider.outputs object.
      output "url" {
        value       = google_storage_bucket.example.self_link
      }

      resource "random_id" "example" {
        byte_length = 4
      }

      // The google provider and remote state are configured by the provider
      // config - see examples/providerconfig.yaml.
      resource "google_storage_bucket" "example" {
        name = "crossplane-example-${terraform.workspace}-${random_id.example.hex}"
      }
  writeConnectionSecretToRef:
    namespace: default
    name: terraform-workspace-example-inline

apiVersion: tf.upbound.io/v1beta1
kind: Workspace
metadata:
  name: example-remote
  annotations:
    crossplane.io/external-name: myworkspace
spec:
  forProvider:
    # Use any module source supported by terraform init -from-module.
    source: Remote
    module: https://github.com/crossplane/tf
    # Variables can be specified inline as a list of key-value pairs or as an json object, or loaded from a ConfigMap or Secret.
    vars:
    - key: region
      value: us-west-1
    varmap:
      account:
        region: us-west-1
        owners:
        - example-owner-1
        - example-owner-2
    varFiles:
    - source: SecretKey
      secretKeyRef:
        namespace: default
        name: terraform
        key: example.tfvar.json
  # All Terraform outputs are written to the connection secret.
  writeConnectionSecretToRef:
    namespace: default
    name: terraform-workspace-example-inline

Getting Started

Follow the quick start guide here.

You can find a detailed API reference with all CRDs and examples here.

Further Configuration

You can find more information about configuring the provider further here.

Polling Interval

The default polling interval has been updated to 10 minutes from 1 minute. This affects how often the provider will run terraform plan on existing Workspaces to determine if there are any resources out of sync and whether terraform apply needs to be re-executed to recover the desired state. A 1 minute polling interval is often too short when the time required for running terrform init, terraform plan and terraform apply is taken into account. Workspaces with large numbers of resources can take longer than 1 minute to run terraform plan. Changes to the Workspace object spec will still be reconciled immediately. The poll interval is configurable using ControllerConfig.

Known limitations:

• You must either use remote state or ensure the provider container's /tf directory is not lost. provider-terraform does not persist state; consider using the Kubernetes remote state backend.
• If the module takes longer than the value of --timeout (default is 20m) to apply the underlying terraform process will be killed. You will potentially lose state and leak resources. The workspace lock will also likely be left in place and need to be manually removed before the Workspace can be reconciled again.
• The provider won't emit an event until after it has successfully applied the Terraform module, which can take a long time.
• Setting --max-reconcile-rate to a value greater than 1 will potentially cause the provider to use up to the same number of CPUs. Add a resources section to the ControllerConfig to restrict CPU usage as needed.

Report a Bug

For filing bugs, suggesting improvements, or requesting new features, please open an issue.

Contact

Please open a Github issue for all requests. If you need to reach out to Upbound, you can do so via the following channels:

• Slack: #upbound channel in Crossplane Slack
• Twitter: @upbound_io
• Email: [email protected]

Licensing

Provider Terraform is under the Apache 2.0 license with notice.