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Apply Terraform module structure, state management, and variable patterns for infrastructure as code. Use when writing Terraform.
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| name | terraform-patterns |
| description | Apply Terraform module structure, state management, and variable patterns for infrastructure as code. Use when writing Terraform. |
infra/terraform/
├── modules/
│ ├── networking/
│ ├── database/
│ └── compute/
└── environments/
├── dev/
│ ├── main.tf
│ ├── variables.tf
│ └── terraform.tfvars
├── staging/
└── prod/
# modules/database/main.tf
resource "aws_db_instance" "main" {
# finops: ~$180/mo (db.t3.medium, 100GB gp3, single AZ)
identifier = "${var.environment}-${var.name}-db"
engine = "postgres"
engine_version = "16"
instance_class = var.instance_class
allocated_storage = var.storage_gb
storage_type = "gp3"
storage_encrypted = true
username = var.username
password = var.password
vpc_security_group_ids = [aws_security_group.db.id]
db_subnet_group_name = aws_db_subnet_group.main.name
backup_retention_period = var.environment == "prod" ? 7 : 1
deletion_protection = var.environment == "prod"
tags = merge(var.tags, {
Environment = var.environment
ManagedBy = "terraform"
})
}
# Initialize (first time or after provider changes)
terraform init
# Format check (CI)
terraform fmt -check -recursive
# Validate syntax
terraform validate
# Plan (always before apply)
terraform plan -out=plan.tfplan -var-file=environments/dev/terraform.tfvars
# Apply (requires explicit instruction)
terraform apply plan.tfplan
# State inspection
terraform show
terraform state list
terraform validate before reporting complete.terraform plan to show what will change.terraform apply without explicit instruction.# finops: cost estimate.