Advanced Node.js

Chapter 15: Production Deployment

15.1 Deployment Strategies

Proper deployment ensures applications run reliably in production environments.

Process Management:

// PM2 - Process manager
// pm2 start ecosystem.config.js

// ecosystem.config.js
module.exports = {
    apps: [{
        name: 'my-app',
        script: './app.js',
        instances: 'max',
        exec_mode: 'cluster',
        env: {
            NODE_ENV: 'production'
        }
    }]
};

15.2 Docker Deployment

# Dockerfile
FROM node:18-alpine
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
EXPOSE 3000
CMD ["node", "app.js"]

# docker-compose.yml
version: '3.8'
services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=production
    restart: always

15.3 CI/CD Pipeline

# .github/workflows/deploy.yml
name: Deploy
on:
  push:
    branches: [main]
jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Setup Node.js
        uses: actions/setup-node@v2
      - name: Install dependencies
        run: npm ci
      - name: Run tests
        run: npm test
      - name: Deploy
        run: npm run deploy

15.4 Environment Configuration

// Use environment variables
require('dotenv').config();

const config = {
    port: process.env.PORT || 3000,
    db: {
        host: process.env.DB_HOST,
        user: process.env.DB_USER,
        password: process.env.DB_PASSWORD
    }
};

15.5 Zero-Downtime Deployment

// Graceful shutdown
process.on('SIGTERM', () => {
    console.log('SIGTERM received, shutting down gracefully');
    server.close(() => {
        console.log('Process terminated');
    });
});

Conclusion

Master advanced Node.js to build scalable, high-performance applications.