Introduction

This guide walks you through migrating an existing Tomcat application to AWS ECS Fargate — covering everything from session management and DB migration to Auto Scaling, with a production-ready setup in mind.

Who this is for

Developers migrating a Tomcat app to AWS

Engineers new to ECS Fargate

Final Architecture

Internet │ ALB (port 80/443) │ ECS Fargate ├─ ElastiCache (Redis) ← session store └─ RDS (PostgreSQL) ← persistent data

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STEP 1: Create Security Groups

Create dedicated security groups for ALB, ECS, Redis, and RDS.…