Terraform AWS VPC + EC2 (Apache) — Modular Infrastructure 🚀

---

📖 Overview

This project provisions a 2-tier AWS architecture using Terraform modules.
It demonstrates how to design Infrastructure as Code (IaC) with best practices: reusable modules, variables, outputs, and bootstrap automation.

The setup creates:

• Networking (VPC + subnets + routing)
• Security (web & db security groups)
• Compute (EC2 instances for web & db)
• Bootstrap (Apache web server auto-configured via user_data)

---

📊 Architecture

• VPC (10.0.0.0/16) – isolated network
• Public Subnet (10.0.1.0/24) – hosts Apache web server
• Private Subnet (10.0.2.0/24) – hosts DB instance (no public IP)
• Internet Gateway (IGW) – internet access for public subnet
• NAT Gateway (optional) – outbound internet for private subnet
• Security Groups –
  • Web SG → HTTP (80), SSH (22)
• EC2 Instances –
  • Web (public subnet) → Apache auto-installed via user-data.sh
  • DB (private subnet) → no public IP, backend-only

---

🧱 Project Structure

terraform-vpc-ec2-apache-modular/
├── main.tf                 # Root module wiring (calls submodules)
├── versions.tf             # Terraform + provider requirements
├── provider.tf             # AWS provider
├── variables.tf            # Input variables
├── outputs.tf              # Output values
├── user-data.sh            # Bootstrap script (Apache install + HTML)
├── .gitignore
├── README.md
│
├── modules/                # Reusable modules
   ├── vpc/                # VPC, subnets, IGW, NAT, routes
   ├── security/           # Web + DB security groups
   └── ec2/                # Web + DB EC2 instances