Terraform VPC Module

This Terraform module creates a Virtual Private Cloud (VPC) in AWS, along with public and private subnets, an internet gateway, a NAT gateway, and appropriate route tables. It is designed to provide a basic networking setup that allows public instances to access the internet and private instances to communicate outbound via a NAT Gateway.

Features

• Creates a VPC with customizable CIDR blocks.

• Configures public and private subnets.

• Creates an Internet Gateway (IGW) for public subnets.

• Deploys a NAT Gateway to enable outbound internet access for private subnets.

• Configures route tables for public and private subnets.

• Supports DNS resolution inside the VPC.

Usage

To use this module in your Terraform configuration, include the following:

module "my_vpc" {
  source = "git::ssh://git@github.com/VasudhaJha/terraform-aws-vpc.git"
  vpc_cidr           = "10.0.0.0/16"
  vpc_name           = "MyAppVPC"
  public_subnet_cidr  = "10.0.1.0/24"
  public_subnet_az    = "us-east-1a"
  private_subnet_cidr = "10.0.2.0/24"
  private_subnet_az   = "us-east-1b"
}

Inputs

Name	Description	Type	Default	Required
vpc_cidr	CIDR block for the VPC	string	n/a	✅
vpc_name	Name of the VPC	string	MyVPC	❌
public_subnet_cidr	CIDR block for the public subnet	string	n/a	✅
public_subnet_az	Availability Zone for the public subnet	string	n/a	✅
public_subnet_name	Name of the public subnet	string	Public Subnet	❌
private_subnet_cidr	CIDR block for the private subnet	string	n/a	✅
private_subnet_az	Availability Zone for the private subnet	string	n/a	✅
private_subnet_name	Name of the private subnet	string	Private Subnet	❌
igw_name	Name of the internet gateway	string	Internet Gateway	❌
nat_gw_name	Name of the NAT gateway	string	NAT Gateway	❌
public_rt_name	Name of the public route table	string	Public Route Table	❌
private_rt_name	Name of the private route table	string	Private Route Table	❌

---

Outputs

Name	Description
vpc_id	The ID of the created VPC
public_subnet_id	The ID of the public subnet
private_subnet_id	The ID of the private subnet
internet_gateway_id	The ID of the Internet Gateway
nat_gateway_public_ip	The public IP of the NAT Gateway

Example Output

After running terraform apply, you will see an output similar to:

Outputs:

vpc_id = "vpc-0abcd1234ef567890"
public_subnet_id = "subnet-0abcd1234ef567890"
private_subnet_id = "subnet-0abcd1234ef567890"
internet_gateway_id = "igw-0abcd1234ef567890"
nat_gateway_public_ip = "203.0.113.25"

Deployment Instructions

1. Initialize Terraform:

terraform init

1. Apply the configuration:

terraform apply

1. Destroy when no longer needed:

terraform destroy

Best Practices

• Use non-overlapping CIDR blocks for each subnet to avoid conflicts.

License

This module is open-source and provided under the MIT License.

Contributing

Feel free to submit pull requests for enhancements, bug fixes, or improvements!

Happy Terraforming!