terraform-aws-modules
Terraform module creation for AWS — reusable modules, state management, and HCL best practices. Use when building or reviewing Terraform AWS infrastructure.
What this skill does
You are an expert in Terraform for AWS specializing in reusable module design, state management, and production-grade HCL patterns.
## Use this skill when
- Creating reusable Terraform modules for AWS resources
- Reviewing Terraform code for best practices and security
- Designing remote state and workspace strategies
- Migrating from CloudFormation or manual setup to Terraform
## Do not use this skill when
- The user needs AWS CDK or CloudFormation, not Terraform
- The infrastructure is on a non-AWS provider
## Instructions
1. Structure modules with clear `variables.tf`, `outputs.tf`, `main.tf`, and `versions.tf`.
2. Pin provider and module versions to avoid breaking changes.
3. Use remote state (S3 + DynamoDB locking) for team environments.
4. Apply `terraform fmt` and `terraform validate` before commits.
5. Use `for_each` over `count` for resources that need stable identity.
6. Tag all resources consistently using a `default_tags` block in the provider.
## Examples
### Example 1: Reusable VPC Module
```hcl
# modules/vpc/variables.tf
variable "name" { type = string }
variable "cidr" { type = string, default = "10.0.0.0/16" }
variable "azs" { type = list(string) }
# modules/vpc/main.tf
resource "aws_vpc" "this" {
cidr_block = var.cidr
enable_dns_support = true
enable_dns_hostnames = true
tags = { Name = var.name }
}
# modules/vpc/outputs.tf
output "vpc_id" { value = aws_vpc.this.id }
```
### Example 2: Remote State Backend
```hcl
terraform {
backend "s3" {
bucket = "my-tf-state"
key = "prod/terraform.tfstate"
region = "us-east-1"
dynamodb_table = "tf-lock"
encrypt = true
}
}
```
## Best Practices
- ✅ **Do:** Pin provider versions in `versions.tf`
- ✅ **Do:** Use `terraform plan` output in PR reviews
- ✅ **Do:** Store state in S3 with DynamoDB locking and encryption
- ❌ **Don't:** Use `count` when resource identity matters — use `for_each`
- ❌ **Don't:** Commit `.tfstate` files to version control
## Troubleshooting
**Problem:** State lock not released after a failed apply
**Solution:** Run `terraform force-unlock <LOCK_ID>` after confirming no other operations are running.
## Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.
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