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Terraform Modules

This folder contains all the terraform modules for the project. The modules are split into categories:

  • services contains mostly single-use modules defining a specific service (e.g. an api or a consumer).
  • storage contains modules for storage resources (e.g. s3 buckets and databases).
  • networking contains modules for networking resources (e.g. vpc and subnets).

Updating a module

Making a change to a module and merging it into main will trigger a new version to be deployed in the development environment, since the modules are sourced using local relative paths in any development/main.tf file.

To then propagate the update through to the production environment, you will need to update the version of the module that is pinned by commit ref in the production/main.tf file to match that of the PR for the initial module change. For example:

95d3758 Update README.md
f465e29 Update new-service-1 in production to module version ca67db4 (#303) <-- Deploys to prod, single-commit PR
ca67db4 Modify new-service-1 module in `/modules` (#302) <-- Deploys to Dev, squashed PR
792cfa7 Add new-service-1 to `production/main.tf` (#301) <-- Deploys to Prod, single-commit PR
4a53d90 Add new-service-1 to `development/main.tf` and create new-service-1 module to `/modules` (#300) <-- Deploys to Dev, squashed PR
367d936 ...

For more information, see the description for the PR implementing this workflow: #233