ops-infra-codelisted

# Infrastructure as Code (Terraform / OpenTofu) Complete guide for Terraform and OpenTofu covering modules, tests, CI/CD and production patterns. Based on [terraform-best-practices.com](https://terraform-best-practices.com) and Anton Babenko's enterprise experience. ## When to use this Skill **Activate this skill to:** - Create Terraform/OpenTofu configurations or modules - Set up the test infrastructure for IaC - Choose between testing approaches (validate, plan, frameworks) - Structure multi-environment deployments - Implement CI/CD for infrastructure-as-code - Review or refactor existing Terraform/OpenTofu projects **Do not use for:** - Basic syntax questions (Claude already knows) - Provider-specific API reference (use the documentation) - Cloud questions unrelated to Terraform/OpenTofu ## Core Principles ### 1. Module Hierarchy | Type | When to use | Scope | |------|-------------|-------| | **Resource Module** | Logical group of connected resources | VPC + subnets, Security group + rules | | **Infrastructure Module** | Collection of resource modules | Several modules in a region/account | | **Composition** | Complete infrastructure | Spans multiple regions/accounts | **Hierarchy:** Resource -> Resource Module -> Infrastructure Module -> Composition ### 2. Directory Structure ``` environments/ # Configurations per environment ├── prod/ ├── staging/ └── dev/ modules/ # Reusable modules ├── networking/ ├── compute/ └── data/ examples/