Terraform Modules: Design Patterns for Reusable Infrastructure

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I once inherited a project with a single main.tf that was over 3,000 lines long. No modules. No abstractions. Just one enormous file that deployed an entire production environment — VPCs, ECS clusters, RDS instances, Lambda functions, IAM roles — all jammed together with hardcoded values and copy-pasted blocks. Changing a security group rule meant scrolling for five minutes and praying you edited…

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