Learn how Terraform module versioning works with semantic versioning, real examples, and best practices for safe upgrades and releases.

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Terraform module versioning follows semantic versioning with major, minor, and patch components. Major versions cover breaking or rollback-unsafe changes, minor versions cover backward-compatible features, and patch versions cover bug fixes. A practical walkthrough demonstrates creating an Azure storage module, fixing a bug (patch bump), adding a storage container (minor bump), and renaming a resource with a moved block (major bump due to rollback risk). Best practices include following semver strictly, maintaining a CHANGELOG.md, minimizing breaking changes, and using version constraints like `~> 2.0.0` or pinning to exact versions as a module consumer.

Terraform Module Versioning: Constraints & Best Practices

How does Terraform module versioning work?

Example module versioning workflow in Terraform

Best practices for Terraform module versioning

How to manage Terraform resources with Spacelift