Terraform AWS 3-Tier Architecture

Overview

This project provisions a secure and highly available 3-tier architecture on AWS using Terraform. The application layer is deployed in private subnets and exposed securely via an Application Load Balancer (ALB).

NGINX is installed on private EC2 instances and accessed from a browser through the ALB.

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Architecture

Request Flow:

User → ALB (Public Subnet) → EC2 (Private Subnet) → RDS

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Architecture Diagram

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AWS Components

• VPC
• Public & Private Subnets
• Route Tables
• Internet Gateway
• NAT Gateway
• Application Load Balancer (ALB)
• EC2 Instances (Private Subnet)
• NGINX Web Server
• RDS (Database Layer)
• Security Groups

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Tools & Technologies

• Terraform (Infrastructure as Code)
• AWS (VPC, EC2, ALB, RDS)
• NGINX
• Linux

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🌐 Application Access

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Security Best Practices

• EC2 instances deployed in private subnets
• No direct public access to EC2
• Traffic allowed only through ALB
• Restricted access using Security Groups
• Terraform state and sensitive files excluded via .gitignore

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Deployment

terraform init
terraform plan
terraform apply