Terraform Module Library

Build production-ready Terraform modules for AWS, Azure & GCP infrastructure

✨ The solution you've been looking for

Verified

Tested and verified by our team

25450 Stars

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.

terraform infrastructure-as-code aws azure gcp multi-cloud devops modules

Repository

See It In Action

Interactive preview & real-world examples

Live Demo

AI Conversation Simulator

See how users interact with this skill

User Prompt

Help me create a Terraform VPC module for AWS that includes private subnets, internet gateway, and follows best practices for tagging and validation

Skill Processing

Analyzing request...

Agent Response

Complete VPC module with main.tf, variables.tf, outputs.tf, proper validation, and usage examples

Quick Start (3 Steps)

Get up and running in minutes

Install

claude-code skill install terraform-module-library

claude-code skill install terraform-module-library

Config

First Trigger

@terraform-module-library help

Commands

Command	Description	Required Args
@terraform-module-library create-standardized-vpc-module	Build a reusable VPC module with subnets, gateways, and proper tagging for consistent network infrastructure across environments	None
@terraform-module-library multi-cloud-module-library	Establish a module library structure supporting AWS, Azure, and GCP with consistent patterns and testing	None
@terraform-module-library module-composition-architecture	Compose multiple modules together to create complete infrastructure stacks while maintaining modularity	None

Typical Use Cases

Create Standardized VPC Module

Build a reusable VPC module with subnets, gateways, and proper tagging for consistent network infrastructure across environments

Multi-Cloud Module Library

Establish a module library structure supporting AWS, Azure, and GCP with consistent patterns and testing

Module Composition Architecture

Compose multiple modules together to create complete infrastructure stacks while maintaining modularity

Overview

Terraform Module Library

Production-ready Terraform module patterns for AWS, Azure, and GCP infrastructure.

Purpose

Create reusable, well-tested Terraform modules for common cloud infrastructure patterns across multiple cloud providers.

When to Use

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

main.tf:

 1resource "aws_vpc" "main" {
 2  cidr_block           = var.cidr_block
 3  enable_dns_hostnames = var.enable_dns_hostnames
 4  enable_dns_support   = var.enable_dns_support
 5
 6  tags = merge(
 7    {
 8      Name = var.name
 9    },
10    var.tags
11  )
12}
13
14resource "aws_subnet" "private" {
15  count             = length(var.private_subnet_cidrs)
16  vpc_id            = aws_vpc.main.id
17  cidr_block        = var.private_subnet_cidrs[count.index]
18  availability_zone = var.availability_zones[count.index]
19
20  tags = merge(
21    {
22      Name = "${var.name}-private-${count.index + 1}"
23      Tier = "private"
24    },
25    var.tags
26  )
27}
28
29resource "aws_internet_gateway" "main" {
30  count  = var.create_internet_gateway ? 1 : 0
31  vpc_id = aws_vpc.main.id
32
33  tags = merge(
34    {
35      Name = "${var.name}-igw"
36    },
37    var.tags
38  )
39}

variables.tf:

 1variable "name" {
 2  description = "Name of the VPC"
 3  type        = string
 4}
 5
 6variable "cidr_block" {
 7  description = "CIDR block for VPC"
 8  type        = string
 9  validation {
10    condition     = can(regex("^([0-9]{1,3}\\.){3}[0-9]{1,3}/[0-9]{1,2}$", var.cidr_block))
11    error_message = "CIDR block must be valid IPv4 CIDR notation."
12  }
13}
14
15variable "availability_zones" {
16  description = "List of availability zones"
17  type        = list(string)
18}
19
20variable "private_subnet_cidrs" {
21  description = "CIDR blocks for private subnets"
22  type        = list(string)
23  default     = []
24}
25
26variable "enable_dns_hostnames" {
27  description = "Enable DNS hostnames in VPC"
28  type        = bool
29  default     = true
30}
31
32variable "tags" {
33  description = "Additional tags"
34  type        = map(string)
35  default     = {}
36}

outputs.tf:

 1output "vpc_id" {
 2  description = "ID of the VPC"
 3  value       = aws_vpc.main.id
 4}
 5
 6output "private_subnet_ids" {
 7  description = "IDs of private subnets"
 8  value       = aws_subnet.private[*].id
 9}
10
11output "vpc_cidr_block" {
12  description = "CIDR block of VPC"
13  value       = aws_vpc.main.cidr_block
14}

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

 1module "vpc" {
 2  source = "../../modules/aws/vpc"
 3
 4  name               = "production"
 5  cidr_block         = "10.0.0.0/16"
 6  availability_zones = ["us-west-2a", "us-west-2b", "us-west-2c"]
 7
 8  private_subnet_cidrs = [
 9    "10.0.1.0/24",
10    "10.0.2.0/24",
11    "10.0.3.0/24"
12  ]
13
14  tags = {
15    Environment = "production"
16    ManagedBy   = "terraform"
17  }
18}
19
20module "rds" {
21  source = "../../modules/aws/rds"
22
23  identifier     = "production-db"
24  engine         = "postgres"
25  engine_version = "15.3"
26  instance_class = "db.t3.large"
27
28  vpc_id     = module.vpc.vpc_id
29  subnet_ids = module.vpc.private_subnet_ids
30
31  tags = {
32    Environment = "production"
33  }
34}

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

 1// tests/vpc_test.go
 2package test
 3
 4import (
 5    "testing"
 6    "github.com/gruntwork-io/terratest/modules/terraform"
 7    "github.com/stretchr/testify/assert"
 8)
 9
10func TestVPCModule(t *testing.T) {
11    terraformOptions := &terraform.Options{
12        TerraformDir: "../examples/complete",
13    }
14
15    defer terraform.Destroy(t, terraformOptions)
16    terraform.InitAndApply(t, terraformOptions)
17
18    vpcID := terraform.Output(t, terraformOptions, "vpc_id")
19    assert.NotEmpty(t, vpcID)
20}

multi-cloud-architecture - For architectural decisions
cost-optimization - For cost-effective designs

What Users Are Saying

Real feedback from the community

Environment Matrix

Dependencies

Terraform 1.0+

Cloud provider CLI tools (aws-cli, azure-cli, gcloud)

Framework Support

Terratest ✓ (recommended) AWS Provider ✓ Azure Provider ✓ Google Cloud Provider ✓

Terraform Module Library

See It In Action

AI Conversation Simulator

Quick Start (3 Steps)

Install

Config

First Trigger

Commands

Typical Use Cases

Create Standardized VPC Module

Multi-Cloud Module Library

Module Composition Architecture

Overview

Terraform Module Library

Purpose

When to Use

Module Structure

Standard Module Pattern

AWS VPC Module Example

Best Practices

Module Composition

Reference Files

Testing

What Users Are Saying

Environment Matrix

Dependencies

Framework Support

Context Window

Security & Privacy

Information

Related Skills

Terraform Module Library

Prowler

Prowler