Deployment to Production

PM2 Process Manager

npm install -g pm2

pm2 start app.js

pm2 start app.js -i max

pm2 list
pm2 logs
pm2 monit
pm2 restart app
pm2 stop app

pm2 startup
pm2 save

Nginx Reverse Proxy

server {
    listen 80;
    server_name example.com;
    
    location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}

sudo ln -s /etc/nginx/sites-available/myapp /etc/nginx/sites-enabled/
sudo nginx -t
sudo systemctl restart nginx

SSL with Let's Encrypt

sudo apt install certbot python3-certbot-nginx

sudo certbot --nginx -d example.com

sudo certbot renew --dry-run

Graceful Shutdown

const server = app.listen(3000);

process.on('SIGTERM', () => {
  console.log('SIGTERM received, closing server...');
  
  server.close(() => {
    mongoose.connection.close(false, () => {
      process.exit(0);
    });
  });
});

Key Takeaway

Use PM2 for process management. Nginx as reverse proxy. Enable SSL with Let's Encrypt. Implement graceful shutdown. Monitor logs and errors.