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3-Tier Architecture with Terraform

Overview

This project creates a fully automated 3-tier architecture in AWS using Terraform. It includes a Virtual Private Cloud (VPC) that spans two Availability Zones (AZs), public and private subnets, a database subnet, two NAT Gateways, an Application Load Balancer (ALB), and a database. The infrastructure is built in a single AWS region, following best practices for high availability and fault tolerance.

Architecture Components:

  1. VPC: A custom Virtual Private Cloud that spans across two Availability Zones.
  2. Subnets:
    • Public Subnets: For internet-facing resources like the ALB.
    • Private Subnets: For backend application servers.
    • DB Subnets: For the RDS instance, isolated for security.
  3. NAT Gateways: One per AZ, to allow private subnets to access the internet for updates.
  4. Application Load Balancer (ALB): Distributes traffic to application servers across multiple AZs.
  5. Database (RDS): A managed database in the isolated DB subnet for secure access.
  6. Security Groups: For controlling inbound and outbound traffic to resources.
  7. Route Tables: For routing traffic between subnets and to the internet.

Prerequisites

  1. AWS Account: To create resources in AWS.
  2. Terraform: To define and provision the infrastructure.
  3. AWS CLI: To configure AWS credentials for Terraform. or you can use AWS IAM Role to provide access to Terraform.

Project Structure

3-tier-architecture/
├── modules/
│   ├── alb/
│   ├── asg/
│   ├── key/
│   ├── nat/
│   ├── rds/
│   ├── sg/
│   └── vpc/
├── terraform/
│   ├── main.tf
│   ├── backend.tf
│   ├── variables.tf
│   ├── provider.tf
│   ├── terraform.tfvars
│   └── outputs.tf
└── README.md

Usage

  1. Clone the repository:
git clone "https:/dhanu0510/terraform_aws_3_tier.git"
cd terraform_aws_3_tier
  1. Initialize the Terraform configuration:
cd terraform
terraform init
  1. Setup AWS CLI or add AWS credentials to provider.tf:
provider "aws" {
  region = "us-east
    access_key
    secret_key
}

  1. Modify the terraform.tfvars file with your settings or leave it as default:

  2. Plan and Apply the Terraform configuration:

terraform plan
terraform apply

Accessing the Application

  1. Get the ALB DNS name from the Terraform output:
terraform output alb_dns_name
  1. Open the ALB DNS name in a web browser to access the application.

Clean Up

  1. Destroy the Terraform resources:
terraform destroy