Three-Tier Cloud Infrastructure Design with AWS

Introduction

A three-tier architecture is a software architecture pattern where the application is divided into three logical tiers: the presentation layer, the business logic layer, and the data storage layer. Each tier performs a specific task and can be managed independently. In this markdown, we'll outline the steps to design and build a three-tier cloud infrastructure using AWS services.

Architecture Overview

The three tiers in our architecture include:

1. Presentation Layer (Frontend)
2. Business Logic Layer (Backend)
3. Data Storage Layer (Database)

AWS Services Used

We shall be using the following AWS services to implement our architecture:

• Elastic Compute Cloud (EC2)
• Virtual Private Cloud (VPC)
• Elastic Load Balancer (ELB)
• Security Groups
• Internet Gateway

Project Overview

Step 1: Create VPC

• Create our own VPC for the project with a specified CIDR Range.

Step 2: Set Internet Gateway

• Attach an Internet Gateway to the VPC to enable internet connectivity.

Step 3: Create Subnets

• Create three subnets: one public and two private subnets.
  • Public subnet: For resources that need to be accessible from the internet.
  • Private subnets: For resources that should not be directly accessible from the internet.

Step 4: Configure Route Tables

• Set up route tables with appropriate table associations to route traffic between subnets and the internet gateway.

Step 5: Create NAT Gateway

• Establish a NAT Gateway to allow private instances to access the internet through the public subnet.

Step 6: Setup RDS Database

• Create an Amazon RDS instance to store application data securely.

Conclusion

By following these steps and utilizing AWS services effectively, we can design and deploy a scalable and reliable three-tier cloud infrastructure for our application.