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Using Private Repositories

If the repository containing the terraform module is private and requires credentials to retrieve, you can add the authentication details to a secret held within the namespace.

Using SSH Authentication​

Let's assume we have a terraform module hosted in a private Github repository. Here's how to add authentication details:

  1. Create an SSH deployment key for the repository with the ability to clone.

  2. Create a Kubernetes secret in the namespace containing the SSH private key.

    $ kubectl -n apps create secret generic ssh --from-file=SSH_KEY_AUTH=id.rsa

  3. Update the Terraform module configuration resource, setting the spec.auth.name: [NAME] to the name of the secret:

    spec:
      auth:
        name: ssh

  4. Reference a git repository as the module source

    spec:
      module: git::ssh://git@github.com/ORG/REPOSITORY?ref=<TAG|BRANCH|COMMIT>
tip

If you need to extract a specific folder within the repository the syntax git::ssh://git@github.com/ORG/REPOSITORY//PATH?ref=<TAG|BRANCH|COMMIT>

Using HTTP Authentication​

Similar to the above, create a Kubernetes secret like so

  1. Create a Kubernetes secret containing the username and password

    $ kubectl -n app create secret generic httpauth --from-literal=GIT_USERNAME=USERNAME --from-literal=GIT_PASSWORD=PASSWORD

  2. Update the Configuration to include the authentication reference

    spec:
      auth:
        name: httpauth

  3. Reference the terraform module using http

    spec:
      module: https://git@github.com/ORG/REPOSITORY?ref=<TAG|BRANCH|COMMIT>

Using Token Authentication​

Use the same process as above, creating a Kubernetes secret TOKEN

What sources are supported?​

We use the same library as Terraform, go-getter that supports:

  • Git
  • Mercurial
  • HTTP
  • Amazon S3
  • Google GCP

For full details, see https://github.com/hashicorp/go-getter.