Terraform 3-Tier Architecture Project

Overview

This project demonstrates a basic 3-tier architecture infrastructure setup using Terraform on AWS. It is designed as a learning project to understand Infrastructure as Code (IaC) concepts and how cloud resources are provisioned and connected.

The architecture includes:

• Web Tier
• Application Tier
• Database Tier

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Architecture

• Web Tier

  • EC2 instance running Apache HTTP Server
  • Exposed to the internet via public subnet

• App Tier

  • EC2 instance in a private subnet
  • Handles backend logic (placeholder setup for learning)

• Database Tier

  • Amazon RDS MySQL instance (or EC2-based DB if configured)
  • Hosted in a private subnet for security

• Networking

  • Custom VPC
  • Public and private subnets
  • Internet Gateway
  • NAT Gateway for private subnet internet access

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Technologies Used

• Terraform
• AWS (EC2, VPC, Subnets, RDS, NAT Gateway)
• Apache HTTP Server
• Ubuntu

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How It Works

1. Terraform creates the AWS infrastructure:

   • VPC
   • Subnets (public & private)
   • Route tables
   • NAT Gateway
   • EC2 instances
   • RDS database

2. User data script installs and configures Apache on the Web Tier EC2.

3. The Web Tier serves a simple HTML page to confirm deployment.

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User Data Script

The web server is configured using userdata.sh:

• Installs Apache HTTP Server
• Starts and enables the service
• Creates a default index.html page

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Architecture Diagram

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How to Deploy

terraform init
terraform plan
terraform apply 

To destroy the infrastructure:

terraform destroy

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Learning Outcome

This project helps understand:

• Infrastructure as Code (IaC)
• AWS networking (VPC, subnets, routing)
• Multi-tier architecture design
• EC2 and RDS provisioning
• Basic automation using Terraform