Tools For Refactoring Terraform

Grep

Usually in the form of git grep or an IDE search function. Useful for scanning a codebase for references when considering a rename or other change. In the case of cross-repo dependencies, consider an org-wide GitHub search or equivalent.

Built in

• terraform plan - Confirm a change is non-disruptive with an empty plan
• terraform state mv
• Moved blocks introduced in Terraform 1.1
• terraform import - Bring an unmanaged resource into your terraform state. Useful for legacy infrastructure or transferring from one state to another.
• terraform validate
• terraform fmt - Format code according to Hashicorp standard.
• local state - Useful for trying out state operations before applying.
• provider documentation - In addition to resource arguments, resource attributes and data sources are also useful.

Migration support

tfmigrate is a Terraform state migration tool for GitOps.

Static checks

• tflint - Linter checking for possible issues including errors, deprecated syntax, and naming conventions
• tfsec - Security scanner for your Terraform code

Testing

tdd-infrastructure is a compilation of terraform testing tools and examples.