Advanced Terraform Module Usage: Versioning, Gotchas, and Reuse Across Environments

Day 9 of my Terraform journey focused on the part of modules that feels more real-world: not just creating them, but using them safely across environments. After building my first reusable module on Day 8, today I went deeper into: module gotchas version pinning using different module versions in different environments This is where Terraform modules start to feel production-ready. Why This Matters A module is useful when it is reusable. A module becomes powerful when: it is versioned environments can adopt changes at different times teams can avoid accidental breakage from untested module updates That was the core lesson of Day 9. Gotcha 1: File Paths Inside Modules One easy mistake is referencing files inside a module using a plain relative path like this: user_data = templatefile("./user-data.sh", { server_port = var.server_port }) The problem is that Terraform may resolve that path relative to where Terraform is run, not relative to the module itself. The safer pattern is: user_dat