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Terraform Module Library

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Build reusable Terraform modules for AWS, Azure, GCP, and OCI infrastructure following infrastructure-as-code best practices. Use when creating infrastructure modules, standardizing cloud provisioning, or implementing reusable IaC components.

Originally by wshobson · MIT

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Build reusable Terraform modules for AWS, Azure, GCP, and OCI infrastructure following infrastructure-as-code best practices. Use when creating infrastructure modules, standardizing cloud provisioning, or implementing reusable IaC components.

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Frontmatter — 2 properties
nameterraform-module-library
descriptionBuild reusable Terraform modules for AWS, Azure, GCP, and OCI infrastructure following infrastructure-as-code best practices. Use when creating infrastructure modules, standardizing cloud provisioning, or implementing reusable IaC components.
1---
2name: terraform-module-library
3description: Build reusable Terraform modules for AWS, Azure, GCP, and OCI infrastructure following infrastructure-as-code best practices. Use when creating infrastructure modules, standardizing cloud provisioning, or implementing reusable IaC components.
4---A5 — No allowed-tools declared — no way to tell what this skill may touch
5 
6# Terraform Module Library
7 
8Production-ready Terraform module patterns for AWS, Azure, GCP, and OCI infrastructure.
9 
10## Purpose
11 
12Create reusable, well-tested Terraform modules for common cloud infrastructure patterns across multiple cloud providers.
13 
14## When to Use
15 
16- Build reusable infrastructure components
17- Standardize cloud resource provisioning
18- Implement infrastructure as code best practices
19- Create multi-cloud compatible modules
20- Establish organizational Terraform standards
21 
22## Module Structure
23 
24```
25terraform-modules/
26├── aws/
27│ ├── vpc/
28│ ├── eks/
29│ ├── rds/
30│ └── s3/
31├── azure/
32│ ├── vnet/
33│ ├── aks/
34│ └── storage/
35├── gcp/
36│ ├── vpc/
37│ ├── gke/
38│ └── cloud-sql/
39└── oci/
40 ├── vcn/
41 ├── oke/
42 └── object-storage/
43```
44 
45## Standard Module Pattern
46 
47```
48module-name/
49├── main.tf # Main resources
50├── variables.tf # Input variables
51├── outputs.tf # Output values
52├── versions.tf # Provider versions
53├── README.md # Documentation
54├── examples/ # Usage examples
55│ └── complete/
56│ ├── main.tf
57│ └── variables.tf
58└── tests/ # Terratest files
59 └── module_test.go
60```
61 
62## AWS VPC Module Example
63 
64**main.tf:**
65 
66```hcl
67resource "aws_vpc" "main" {
68 cidr_block = var.cidr_block
69 enable_dns_hostnames = var.enable_dns_hostnames
70 enable_dns_support = var.enable_dns_support
71 
72 tags = merge(
73 {
74 Name = var.name
75 },
76 var.tags
77 )
78}
79 
80resource "aws_subnet" "private" {
81 count = length(var.private_subnet_cidrs)
82 vpc_id = aws_vpc.main.id
83 cidr_block = var.private_subnet_cidrs[count.index]
84 availability_zone = var.availability_zones[count.index]
85 
86 tags = merge(
87 {
88 Name = "${var.name}-private-${count.index + 1}"
89 Tier = "private"
90 },
91 var.tags
92 )
93}
94 
95resource "aws_internet_gateway" "main" {
96 count = var.create_internet_gateway ? 1 : 0
97 vpc_id = aws_vpc.main.id
98 
99 tags = merge(
100 {
101 Name = "${var.name}-igw"
102 },
103 var.tags
104 )
105}
106```
107 
108**variables.tf:**
109 
110```hcl
111variable "name" {
112 description = "Name of the VPC"
113 type = string
114}
115 
116variable "cidr_block" {
117 description = "CIDR block for VPC"
118 type = string
119 validation {
120 condition = can(regex("^([0-9]{1,3}\\.){3}[0-9]{1,3}/[0-9]{1,2}$", var.cidr_block))
121 error_message = "CIDR block must be valid IPv4 CIDR notation."
122 }
123}
124 
125variable "availability_zones" {
126 description = "List of availability zones"
127 type = list(string)
128}
129 
130variable "private_subnet_cidrs" {
131 description = "CIDR blocks for private subnets"
132 type = list(string)
133 default = []
134}
135 
136variable "enable_dns_hostnames" {
137 description = "Enable DNS hostnames in VPC"
138 type = bool
139 default = true
140}
141 
142variable "tags" {
143 description = "Additional tags"
144 type = map(string)
145 default = {}
146}
147```
148 
149**outputs.tf:**
150 
151```hcl
152output "vpc_id" {
153 description = "ID of the VPC"
154 value = aws_vpc.main.id
155}
156 
157output "private_subnet_ids" {
158 description = "IDs of private subnets"
159 value = aws_subnet.private[*].id
160}
161 
162output "vpc_cidr_block" {
163 description = "CIDR block of VPC"
164 value = aws_vpc.main.cidr_block
165}
166```
167 
168## Best Practices
169 
1701. **Use semantic versioning** for modules
1712. **Document all variables** with descriptions
1723. **Provide examples** in examples/ directory
1734. **Use validation blocks** for input validation
1745. **Output important attributes** for module composition
1756. **Pin provider versions** in versions.tf
1767. **Use locals** for computed values
1778. **Implement conditional resources** with count/for_each
1789. **Test modules** with Terratest
17910. **Tag all resources** consistently
180 
181**Reference:** See `references/aws-modules.md` and `references/oci-modules.md`
182 
183## Module Composition
184 
185```hcl
186module "vpc" {
187 source = "../../modules/aws/vpc"
188 
189 name = "production"
190 cidr_block = "10.0.0.0/16"
191 availability_zones = ["us-west-2a", "us-west-2b", "us-west-2c"]
192 
193 private_subnet_cidrs = [
194 "10.0.1.0/24",
195 "10.0.2.0/24",
196 "10.0.3.0/24"
197 ]
198 
199 tags = {
200 Environment = "production"
201 ManagedBy = "terraform"
202 }
203}
204 
205module "rds" {
206 source = "../../modules/aws/rds"
207 
208 identifier = "production-db"
209 engine = "postgres"
210 engine_version = "15.3"
211 instance_class = "db.t3.large"
212 
213 vpc_id = module.vpc.vpc_id
214 subnet_ids = module.vpc.private_subnet_ids
215 
216 tags = {
217 Environment = "production"
218 }
219}
220```
221 
222 
223## Testing
224 
225```go
226// tests/vpc_test.go
227package test
228 
229import (
230 "testing"
231 "github.com/gruntwork-io/terratest/modules/terraform"
232 "github.com/stretchr/testify/assert"
233)
234 
235func TestVPCModule(t *testing.T) {
236 terraformOptions := &terraform.Options{
237 TerraformDir: "../examples/complete",
238 }
239 
240 defer terraform.Destroy(t, terraformOptions)
241 terraform.InitAndApply(t, terraformOptions)
242 
243 vpcID := terraform.Output(t, terraformOptions, "vpc_id")
244 assert.NotEmpty(t, vpcID)
245}
246```
247 
248## Related Skills
249 
250- `multi-cloud-architecture` - For architectural decisions
251- `cost-optimization` - For cost-effective designs
252 

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