"According to the post, module design starts with carefully understanding the target users and use cases. Module consumers might include development teams, platform engineers, or security specialists, but each module should have a clear purpose and minimal coupling. HashiCorp recommends separating infrastructure components that change frequently from those that are stable, aligning module lifecycle to resource volatility. For example, compute instances and disks might live in one module while long-lived networking infrastructure resides in another."
"Security and testing are also flagged as core concerns. Pronschinske urges teams to validate inputs early using Terraform's variable validation blocks, adopt policy-as-code frameworks such as Sentinel or OPA, and integrate testing into CI/CD pipelines using the native "terraform test" command. Modules that expose fewer inputs, provide sensible defaults, and enforce guardrails are less likely to be misused or introduce risk."
Module design should begin by defining target users and specific use cases, ensuring each module has a single clear purpose and minimal coupling. Separate frequently-changing resources (for example, compute instances and disks) from long-lived infrastructure (for example, networking) to align module lifecycles with resource volatility. Treat modules like software artifacts: apply semantic versioning, structure files intentionally, provide examples and documentation, and mirror provider schemas. Validate inputs early using Terraform variable validation, adopt policy-as-code frameworks such as Sentinel or OPA, expose fewer inputs with sensible defaults, enforce guardrails, and integrate automated tests into CI/CD using the native terraform test command.
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