https://github.com/IITC-College/express-js-app

Lab: Comparing Docker Base Images

Learning Goals

• Understand how the base image affects:
  • image size
  • build speed
  • security surface
• Compare:
  • node:22
  • node:22-slim
  • node:22-alpine
• Understand how changing the base image impacts Docker cache

What You Have

A ready Node.js project will be provided.

The project already includes:

• Express
• TypeScript
• Jest
• Dev dependencies
• Basic application code

You do not need to create the application.

Your focus is Docker image optimization only.

Part 1 — Create a Separate Dockerfile

Tasks