Skip to main content Build reusable Terraform modules for AWS, Azure, and GCP infrastructure following infrastructure-as-code best practices. Use when creating infrastructure modules, standardizing cloud provisioning, or implementing reusable IaC components.
npx skills add sickn33/antigravity-awesome-skills --skill terraform-module-library agentic-skills ai-agents antigravity claude-code mcp ai-workflows
Terraform Module Library
Production-ready Terraform module patterns for AWS, Azure, and GCP infrastructure.
Do not use this skill when
The task is unrelated to terraform module library
You need a different domain or tool outside this scope
Instructions
Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.
Purpose
Create reusable, well-tested Terraform modules for common cloud infrastructure patterns across multiple cloud providers.
Use this skill when
Build reusable infrastructure components
Standardize cloud resource provisioning
Implement infrastructure as code best practices
Create multi-cloud compatible modules
Establish organizational Terraform standards
Module Structure
terraform-modules/
├── aws/
│ ├── vpc/
│ ├── eks/
│ ├── rds/
│ └── s3/
├── azure/
│ ├── vnet/
│ ├── aks/
│ └── storage/
└── gcp/
├── vpc/
├── gke/
└── cloud-sql/
Standard Module Pattern
module-name/
├── main.tf # Main resources
├── variables.tf # Input variables
├── outputs.tf # Output values
├── versions.tf # Provider versions
├── README.md # Documentation
├── examples/ # Usage examples
│ └── complete/
│ ├── main.tf
│ └── variables.tf
└── tests/ # Terratest files
└── module_test.go
AWS VPC Module Example resource "aws_vpc" "main" {
cidr_block = var.cidr_block
enable_dns_hostnames = var.enable_dns_hostnames
enable_dns_support = var.enable_dns_support
tags = merge(
{
Name = var.name
},
var.tags
)
}
resource "aws_subnet" "private" {
count = length(var.private_subnet_cidrs)
vpc_id = aws_vpc.main.id
cidr_block = var.private_subnet_cidrs[count.index]
availability_zone = var.availability_zones[count.index]
tags = merge(
{
Name = "${var.name}-private-${count.index + 1}"
Tier = "private"
},
var.tags
)
}
resource "aws_internet_gateway" "main" {
count = var.create_internet_gateway ? 1 : 0
vpc_id = aws_vpc.main.id
tags = merge(
{
Name = "${var.name}-igw"
},
var.tags
)
}
variable "name" {
description = "Name of the VPC"
type = string
}
variable "cidr_block" {
description = "CIDR block for VPC"
type = string
validation {
condition = can(regex("^([0-9]{1,3}\\.){3}[0-9]{1,3}/[0-9]{1,2}$", var.cidr_block))
error_message = "CIDR block must be valid IPv4 CIDR notation."
}
}
variable "availability_zones" {
description = "List of availability zones"
type = list(string)
}
variable "private_subnet_cidrs" {
description = "CIDR blocks for private subnets"
type = list(string)
default = []
}
variable "enable_dns_hostnames" {
description = "Enable DNS hostnames in VPC"
type = bool
default = true
}
variable "tags" {
description = "Additional tags"
type = map(string)
default = {}
}
output "vpc_id" {
description = "ID of the VPC"
value = aws_vpc.main.id
}
output "private_subnet_ids" {
description = "IDs of private subnets"
value = aws_subnet.private[*].id
}
output "vpc_cidr_block" {
description = "CIDR block of VPC"
value = aws_vpc.main.cidr_block
}
Best Practices
Use semantic versioning for modules
Document all variables with descriptions
Provide examples in examples/ directory
Use validation blocks for input validation
Output important attributes for module composition
Pin provider versions in versions.tf
Use locals for computed values
Implement conditional resources with count/for_each
Test modules with Terratest
Tag all resources consistently
Module Composition module "vpc" {
source = "../../modules/aws/vpc"
name = "production"
cidr_block = "10.0.0.0/16"
availability_zones = ["us-west-2a", "us-west-2b", "us-west-2c"]
private_subnet_cidrs = [
"10.0.1.0/24",
"10.0.2.0/24",
"10.0.3.0/24"
]
tags = {
Environment = "production"
ManagedBy = "terraform"
}
}
module "rds" {
source = "../../modules/aws/rds"
identifier = "production-db"
engine = "postgres"
engine_version = "15.3"
instance_class = "db.t3.large"
vpc_id = module.vpc.vpc_id
subnet_ids = module.vpc.private_subnet_ids
tags = {
Environment = "production"
}
}
Reference Files
assets/vpc-module/ - Complete VPC module example
assets/rds-module/ - RDS module example
references/aws-modules.md - AWS module patterns
references/azure-modules.md - Azure module patterns
references/gcp-modules.md - GCP module patterns
Testing // tests/vpc_test.go
package test
import (
"testing"
"github.com/gruntwork-io/terratest/modules/terraform"
"github.com/stretchr/testify/assert"
)
func TestVPCModule(t *testing.T) {
terraformOptions := &terraform.Options{
TerraformDir: "../examples/complete",
}
defer terraform.Destroy(t, terraformOptions)
terraform.InitAndApply(t, terraformOptions)
vpcID := terraform.Output(t, terraformOptions, "vpc_id")
assert.NotEmpty(t, vpcID)
}
Related Skills
multi-cloud-architecture - For architectural decisions
cost-optimization - For cost-effective designs
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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Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).