Module Design & Reusability

Best practices for writing modular, reusable, and version-controlled Terraform code.

Language / Topic

Terraform

Rules

Module Design & Reusability · balanced balanced

- Build reusable modules mapped to standard architectural patterns rather than simple single-resource wrappers

- Pin exact versions of modules and providers in your consuming code (e.g., `version = "~> 3.0"`)

- Document module inputs, outputs, and requirements using `terraform-docs`

- Keep module logic declarative: avoid excessive `dynamic` blocks or complex `for_each` structures that make inputs confusing

- Use public registries or private git tags as module sources to lock upstream dependencies and prevent surprise breaking changes

- Group resources logically in standard files: `main.tf`, `variables.tf`, `outputs.tf`, `providers.tf`