swarkentin / codeship-docker-terraform

Experimental repository to get started with Terraform on Codeship Pro

Codeship Pro, Terraform Example

This sample repository details the steps necessary to get started with terraform on Codeship Pro.

It is in experimental state right now and might not work for every setup.

Terraform Configuration

The repository contains a very basic terraform configuration. It is configured with remote state and state locking based on AWS S3 and AWS DynamoDB. The configuration itself takes care of configuring the remote state backend (via the 00_terraform.tf file) as well as configuring the required ressources on AWS (via the 01_aws.tf file).

All required credentials are provided via environment variables, see the env.example file for a sample version).

Codeship Pro Configuration

The repository contains a simple Dockerfile based on the hashicorp/terraform:light image. It configures a working directory and copies all required files into the Docker image.

The codeship-services.yml configures a service based on that image. It additionally mounts the ./tmp directory into the container to allow steps to share data (mainly required for sharing the computed tfplan file from the plan step to the apply step). It also configures the container to use an encrypted environment file (defaulting to env.encrypted) to provide the container with access to AWS.

The codeship-steps.yml configures the following 4 steps

1. version: which simply prints the current terraform version information
2. init: required to initizalize the remote state backend
3. plan: to compute a terraform plan of any required changes. The generated plan is shared with the apply step via a volume to ensure that only those changes are made.
4. apply: (limited to the master branch) to actually make the requested changes. This step reuses the plan computed in step 3

Please see the terraform documentation for more information on the individual commands, their usage and available options.