Learning Objectives

• Set up microservices architecture
• Configure Docker containers
• Implement message queuing
• Docker Desktop installed
• Redis/RabbitMQ installed
• PostgreSQL installed
• Kubernetes (optional) installed (Diagram)

Step 1: Docker Compose

yaml
# docker-compose.yml
version: '3.8'
services:
  auth-service:
    build: ./auth-service
    ports:
      - "5001:5000"
  core-service:
    build: ./core-service
    ports:
      - "5002:5000"
  postgres:
    image: postgres:15
    environment:
      POSTGRES_DB: mad2db
      POSTGRES_PASSWORD: secret
  redis:
    image: redis:7-alpine

Step 2: Flask Microservice Template

python
Run Inline
# service/app.py
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_jwt_extended import JWTManager
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://user:pass@postgres/dbname'
db = SQLAlchemy(app)
jwt = JWTManager(app)
if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)

• docker-compose up starts all services
• Each service responds on its port
• Database migrations run
• Redis accessible
• Docker build fails: Check Dockerfile syntax
• Port conflicts: Change host port mappings
• DB connection: Check POSTGRES_PASSWORD matches
• Docker Compose works
• Multiple services deployed
• Inter-service communication working
• Redis/RabbitMQ configured
• Environment variables documented Join Discord NextMilestone 2: Database Design & ORM