Custom Terraform AWS VPC Module

This custom Terraform module provisions an AWS Virtual Private Cloud (VPC) with support for public and private subnets, NAT Gateways, Internet Gateways, and tagging across multiple Availability Zones.

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Table of Contents

• Features
• Usage
  • Requirements
  • Prerequisites
  • Basic Usage
• Inputs
• Outputs
• Command Usage
• Resource Confirmation
• Examples
• Contributing
• Authors

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Features

• VPC Foundation

  • Customizable CIDR block
  • DNS hostnames and resolution support
  • Multi-AZ support

• Networking Components

  • Public subnets with Internet Gateway
  • Private subnets with NAT Gateway
  • Elastic IPs for NAT Gateways
  • Route tables and subnet associations

• Security

  • Default security groups

• Tagging

  • Consistent tagging across all resources
  • Customizable tags per subnet type

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Usage

Requirements

Name	Version
Terraform	>= 1.0
AWS Provider	>= 5.79

Prerequisites

• AWS Account
• Terraform Installation
• AWS CLI Installation
• AWS CLI configured with credentials and region

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Basic Usage

module "vpc" {
  source  = "git::https://github.com/your-repo/terraform-aws-vpc.git?ref=v1.0.0"

  name = "my-vpc"
  cidr = "10.0.0.0/16"
  azs  = ["us-east-1a", "us-east-1b"]

  public_subnets  = ["10.0.1.0/24", "10.0.2.0/24"]
  private_subnets = ["10.0.101.0/24", "10.0.102.0/24"]

  enable_nat_gateway = true
  enable_vpn_gateway = false

  tags = {
    Terraform   = "true"
    Environment = "dev"
  }
}

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Inputs

Name	Description	Type	Default	Required
name	Name to be used on all resources as prefix	string	-	yes
cidr	The CIDR block for the VPC	string	-	yes
azs	A list of availability zones in the region	list(string)	-	yes
public_subnets	A list of public subnets CIDRs	list(string)	[]	no
private_subnets	A list of private subnets CIDRs	list(string)	[]	no
database_subnets	A list of database subnets CIDRs	list(string)	[]	no
enable_nat_gateway	Should be true if you want to provision NAT Gateways	bool	false	no
single_nat_gateway	Should be true if you want to provision a single shared NAT Gateway	bool	false	no
enable_flow_log	Whether to enable VPC Flow Logs	bool	false	no
flow_log_destination_type	Type of flow log destination (cloud-watch-logs or s3)	string	"cloud-watch-logs"	no
tags	Additional tags to apply to all resources	map(string)	{}	no

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Outputs

Name	Description
vpc_id	The ID of the VPC
vpc_cidr_block	The CIDR block of the VPC
public_subnet_ids	List of IDs of public subnets
private_subnet_ids	List of IDs of private subnets
database_subnet_ids	List of IDs of database subnets
nat_gateway_ids	List of NAT Gateway IDs
internet_gateway_id	The ID of the Internet Gateway
vpc_default_security_group_id	The ID of the default security group

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Command Usage

aws configure

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terraform init

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terraform plan

terraform apply

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Resource Confirmation

• VPC Confirmation

• Subnet Confirmation

• NAT Gateway Confirmation

• Internet Gateway Confirmation

• Route Table Confirmation

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👥 Collaborators

• Eric Gomado
• Augustine Tetteh Ozor