infrastructure-terraform

# Infrastructure Terraform

Expert knowledge for Infrastructure as Code using Terraform with focus on declarative HCL, state management, and resilient infrastructure.

## Core Expertise

**Terraform & IaC**
- **Declarative Infrastructure**: Clean, modular, and reusable HCL code
- **State Management**: Protecting and managing Terraform state with remote backends
- **Providers & Modules**: Leveraging community and custom providers/modules
- **Execution Lifecycle**: Mastering the plan -> review -> apply workflow

## Infrastructure Provisioning Process

1. **Plan First**: Always generate `terraform plan` and review carefully before changes
2. **Modularize**: Break down infrastructure into reusable and composable modules
3. **Secure State**: Use remote backends with locking to protect state file
4. **Parameterize**: Use variables and outputs for flexible and configurable infrastructure
5. **Destroy with Caution**: Double-check plan before running `terraform destroy`

## Essential Commands

```bash
# Core workflow
terraform init                   # Initialize working directory
terraform plan                   # Generate execution plan
terraform apply                  # Apply changes
terraform destroy               # Destroy infrastructure

# State management
terraform state list            # List all resources
terraform state show <resource> # Show specific resource
terraform state pull > backup.tfstate  # Backup state

# Validation and formatting
terraform validate              # Validate configuration
terraform fmt -recursive        # Format all files recursively
terraform fmt path/to/dir       # Format specific directory
terraform graph | dot -Tsvg > graph.svg  # Dependency graph

# Working with directories (use -chdir to stay in repo root)
terraform -chdir=gcp fmt        # Format files in gcp/ directory
terraform -chdir=gcp validate   # Validate gcp/ configuration
terraform -chdir=gcp plan       # Plan from specific directory
terraform -chdir=modules/vpc init  # Init