Microservices Architecture Demo

This project demonstrates a complete microservices architecture with service discovery, API gateway, distributed tracing, and containerized deployment.

Architecture Overview

API Gateway (Nginx/Kong)
    ↓
Service Discovery (Consul)
    ↓
┌─────────────┬─────────────┬─────────────┐
│  User       │  Product    │  Order      │
│  Service    │  Service    │  Service    │
└─────────────┴─────────────┴─────────────┘
         ↓             ↓            ↓
    PostgreSQL    MongoDB      MySQL

Services

1. User Service

• User authentication and management
• JWT token generation
• Profile management
• Tech: Node.js + Express + PostgreSQL

2. Product Service

• Product catalog management
• Inventory tracking
• Search functionality
• Tech: Node.js + MongoDB

3. Order Service

• Order processing
• Payment integration
• Order history
• Tech: Node.js + MySQL

Key Components

API Gateway

• Request routing
• Load balancing
• Rate limiting
• Authentication

Service Discovery (Consul)

• Service registration
• Health checking
• Configuration management

Message Queue (RabbitMQ)

• Asynchronous communication
• Event-driven architecture
• Reliable message delivery

Distributed Tracing (Jaeger)

• Request tracing across services
• Performance monitoring
• Dependency visualization

Docker Deployment

Each service runs in its own container:

version: '3.8'
services:
  user-service:
    build: ./user-service
    ports:
      - "3001:3000"
    environment:
      - DATABASE_URL=postgresql://...
      
  product-service:
    build: ./product-service
    ports:
      - "3002:3000"
    environment:
      - MONGODB_URI=mongodb://...

Inter-Service Communication

REST API

// Product service calling User service
const user = await axios.get(
    `http://user-service:3000/api/users/${userId}`
);

Event-Driven

// Order service publishing event
channel.publish('orders', 'order.created', 
    Buffer.from(JSON.stringify(order))
);

Running Locally

# Start all services
docker-compose up -d

# Check service health
curl http://localhost:8500/v1/health/state/passing

# Access API Gateway
curl http://localhost:8080/api/users

Current Status

🚧 In Progress: Implementing Kubernetes deployment and CI/CD pipeline

View progress on GitHub.