Public Route Table

📦 Overview

This Terraform module provisions a public route table within a specified VPC and optionally associates it with one or more public subnets.

It enables internet access by routing 0.0.0.0/0 traffic through an Internet Gateway (IGW), making it suitable for public-facing resources such as load balancers or bastion hosts.

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✅ Key Features

• Creates a public route table in the specified VPC
• Adds default route to an existing Internet Gateway
• Optionally associates the route table with one or more subnet IDs
• Supports environment-based tagging

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💼 Use Cases

• Configure internet access for EC2 instances in public subnets
• Enable routing for load balancers, NAT gateways, or public-facing apps
• Attach route table to bootstrap infrastructure like bastion hosts or DNS resolvers

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📥 Input Variables

Name	Type	Description
region	string	AWS region where the route table will be created
vpc_id	string	The ID of the VPC to create the route table in
igw_id	string	The ID of the Internet Gateway to route public traffic through
subnet_ids	list(string)	(Optional) Subnet IDs to associate with the route table
environment	string	Deployment environment tag (e.g., dev, prod)

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📤 Outputs

Name	Description
route_table_id	The ID of the created public route table

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🚀 Deployment Readiness

• ✅ Compatible with Terraform 1.0+
• ✅ Tested with AWS provider 5.x
• 🧪 Requires permissions to manage VPC route tables and associations

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🛠️ Example Usage

module "route_table_public" {
  source      = "git::ssh://git@github.com/archiphire/aws-level-1-modules.git//network/route-table-public?ref=v1.0.0"

  region       = "us-east-1"
  vpc_id       = "vpc-0123456789abcdef0"
  igw_id       = "igw-0a1b2c3d4e5f6g7h8"
  subnet_ids   = ["subnet-abc123", "subnet-def456"]
  environment  = "dev"
}

terraform init
terraform plan
terraform apply

or

tofu init
tofu plan
tofu apply

🧹 Cleanup Options

Terraform Destroy (for isolated testing):

terraform destroy

or

tofu destroy

Manual Deletion (recommended for production):

Delete the route table and associations manually via the AWS Console or CLI to avoid disrupting public subnet access.

🛡️ Notes

This is a Level 1 networking module designed to support outbound internet routing for public subnets.

For private subnet configurations, pair this with the route-table-private and nat-gateway modules for a complete VPC topology.

🔒 Deployment Package Notice

This module is part of the Level 1 AWS License Tier. To access the full deployment package and source code, subscribe to Archiphire.