CZtack

Cztack (pronounced "stack") is CZI's collection of Terraform modules. We use these as way to scale our infrastructure work.

These modules are compatible with Terraform 0.12 and up.

Contributing

Making a release

Release-please managages all the releases. To make a release, merge the release PR.

Adding a new module

To create a new module, copy the module-template directory and modify as you see fit. And make sure to add the module to the list of modules to test in .github/workflows/ci.yml.

Writing tests

A few notes on writing test for this repo. Note that this is new ground for us, so this will be a work in progress.

• To make modules testable, all fields that have a unique constraint need to be parameterizeable. Otherwise concurrent tests will conflict.
• It is tempting in testing module A to use module B to set up some context, but because terraform will just store the statefile locally, you can have a conflict.
  • We've tried to avoid this for now and set up context more directly
  • And also to not run tests in parrallel
  • and to clean up state files before and after each run
• our linter requires a test for each module. At the very least run init so that its syntax is checked. See an example here.
• AWS IAM is eventually consistent and supposedly is homed in us-east-1, so its probably best to run all tests that use IAM in that region.

Test Dependencies

• go
• terraform
• terraform-provider-bless - Place it in the same directory as your terraform executable. dirname \which terraform``