Prakash 07

Posted on Apr 10

AWS Three-Tier Architecture

#aws #cloud

🚀 Deploying a Scalable Web Application on AWS
In this article, we'll guide you through the complete setup and deployment of a scalable, production-ready web application on AWS. We'll cover key components including architecture design, networking, EC2 instances, databases, load balancers, and auto-scaling. By the end of this walkthrough, you'll have a fully functional, auto-scaled web application successfully deployed on AWS.

🟣 PART 1 — Architecture & Initial Setup
✅ Architecture Overview

✅ 1. Download Code from GitHub
Clone the GitHub repository containing the application code.

✅ 2. Create an S3 Bucket
Navigate to S3 Service > Create Bucket.

✅ 3. IAM Role for EC2-S3 Communication
Go to IAM > Roles > Create Role.

Select EC2 and attach the following policies:

1. AmazonSSMManagedInstanceCore
2. AmazonS3ReadOnlyAccess

🟣 PART 2 — Networking & Security
✅ 1. VPC Creation

Go to VPC Dashboard > Your VPCs > Create VPC.

✅ 2. Subnet Creation
Create 6 subnets across two Availability Zones for high availability.

✅ 3. Internet Gateway
Create and attach an Internet Gateway to the VPC for public subnet internet access.

✅ 4. NAT Gateway
Create NAT Gateways in your public subnets for private subnets to access the internet.

✅ 5. Routing Configuration
Set up Route tables and associate subnets properly.

✅ 6. Security Groups
Define security groups for EC2 and Load Balancers to control traffic.

🟣 PART 3 — Database Deployment
✅ 1. Subnet Group for RDS

Create an RDS Subnet Group using private subnets.

✅ 2. Database Creation
Create your RDS database instance.

🟣 PART 4 — Application Deployment
✅ 1. Launch App Instance

Launch an EC2 instance for your App Tier.

✅ 2. Connect to Instance

Use Session Manager to connect to your instance securely.

✅ 3. Configure Database Connection

Configure database credentials for the application.

✅ 4. Configure App Instance
Update your app-tier to use correct database and S3 details.

Upload your app-tier code to S3.

✅ 5. Test App
Ensure the app-tier is working correctly.

🟣 PART 5 — Internal Load Balancer & Auto Scaling
✅ 1. App Tier AMI

Create an AMI from your configured App Instance.

✅ 2. Create Target Group

✅ 3. Internal Load Balancer
Deploy an internal Load Balancer.

✅ 4. Launch Template
Create a Launch Template with the AMI.

✅ 5. Auto Scaling Group
Set up Auto Scaling for your App Tier.

🟣 PART 6 — Web Instance Deployment
✅ 1. Update Config File
In the nginx.conf, replace [INTERNAL-LOADBALANCER-DNS] with your internal load balancer DNS.