13. PM2 Enterprise Process Manager: Cluster Mode, Ecosystem Config & Graceful Reloads • DevOps, Docker & Cloud VPS Deployment Mastery • Rishabh Ki Kaksha

DevOps, Docker & Cloud VPS Deployment Mastery › 13. PM2 Enterprise Process Manager: Cluster Mode, Ecosystem Config & Graceful Reloads

45 mins

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Course Syllabus

Module 1: Linux System Administration & Kernel Performance Tuning

01. Linux OS Architecture: Kernel vs User Space, System Calls & Process Management (ps, top, htop) 02. Linux File Permissions (chmod, chown, SUID/SGID) & Sticky Bits Security 03. Networking & Diagnostics: netstat, ss, lsof, tcpdump, curl, dig & DNS Resolution

Part 1: Linux & Docker Containerization

Module 2: Containerization with Docker & Multi-Stage Builds

04. Docker Architecture: Namespaces, Cgroups, UnionFS & Docker Engine Internals 05. Dockerfile Optimization: Layer Caching, Non-Root Users & Ultra-Light Alpine Multi-Stage Builds 06. Docker Compose: Multi-Container Networking, Persistent Volumes & Environment Config 07. Docker Production Security: Read-Only Root FS, Capabilities Drop & Container Scanning

Part 2: Nginx, SSL, PM2 & Automated CI/CD

Module 3: Nginx Reverse Proxy, SSL Automation & Security Hardening

08. Nginx Masterclass: Event-Driven Non-Blocking Architecture vs Apache Multi-Threaded 09. Nginx as Reverse Proxy, Load Balancer (upstream) & Gzip/Brotli Compression Config 10. SSL/TLS Automation with Certbot Let's Encrypt, HTTP/2 & Strict-Transport-Security (HSTS) 11. Nginx Rate Limiting (limit_req), DDoS Mitigation & Security Headers Injection

Module 4: Process Management with PM2 & Systemd Services

12. Systemd Services: Creating Custom System Daemons with Automatic Restart & Logging 13. PM2 Enterprise Process Manager: Cluster Mode, Ecosystem Config & Graceful Reloads 14. Log Management & Rotation: logrotate, journalctl & Centralized Syslog Streaming

Module 5: CI/CD Automation with GitHub Actions & Zero-Downtime Deployments

15. CI/CD Foundations: Building Automated Test & Build Pipelines with GitHub Actions 16. Automated SSH Deployments: Self-Hosted Runners, Deploy Keys & Zero-Downtime Atomic Symlinks 17. Blue-Green & Canary Deployment Strategies on Cloud VPS Infrastructure

Module 6: Cloud VPS Production Hardening, Firewall (UFW) & Backups

18. Cloud VPS Hardening: Non-Root Sudo Users, SSH Key-Only Auth, Fail2ban & UFW Firewall Rules 19. Automated Database & Media Backups to Cloud Storage (AWS S3 / Cloudflare R2 / MinIO) 20. Server Health Monitoring & Alerting: Uptime Kuma, Netdata, Prometheus & Telegram Bot Webhooks

Interactive Lesson Studio

# 13. PM2 Enterprise Process Manager: Cluster Mode, Ecosystem Config & Graceful Reloads

> DevOps & Cloud VPS Notes by Rishabh - Topic 13

---

### 1. Production `ecosystem.config.js` Architecture 🚀

Node.js single-threaded hota hai. **PM2 Cluster Mode** server ke **saare CPU Cores** par instances fork karta hai zero code changes ke sath:

```javascript
module.exports = {
  apps: [
    {
      name: "rishabh-api",
      script: "./dist/index.js",
      instances: "max", // Utilizes 100% of available CPU cores!
      exec_mode: "cluster",
      max_memory_restart: "500M", // Auto-restarts if memory leak occurs
      watch: false,
      env_production: {
        NODE_ENV: "production",
        PORT: 3000
      },
      kill_timeout: 5000, // Wait 5s for active requests before termination
      listen_timeout: 8000
    }
  ]
};
```

---

### 2. Zero-Downtime Rolling Reload (`pm2 reload`)

*   `pm2 restart app`: Saare workers ek sath kill karke restart karta hai (1-2s downtime!).
*   `pm2 reload app`: **Rolling reload!** 1 worker restart karta hai, uska health verify karta hai, fir agle worker par jata hai (**0ms Zero Downtime!**).

---

### 3. Master Comparison Matrix

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### 4. Interview Ke 3 Sawal Is Topic Se

1. **`pm2 startup` aur `pm2 save` commands VPS reboot persistence me kya karti hain?** -> `pm2 startup` systemd service unit configure karta hai aur `pm2 save` current running process list snapshot save karta hai.
2. **Node.js app me Graceful Shutdown handle karne ka pattern kya hota hai?** -> `process.on('SIGINT', ...)` listen karke `server.close()` call karna aur active DB pools disconnect karna.
3. **PM2 Cluster Mode me socket connections load balance kaun karta hai?** -> Node.js internal `cluster` module Linux kernel Round-Robin IPC master mechanism use karta hai.

---
**Next Topic:** 14. Log Management & Rotation: logrotate, journalctl & Centralized Syslog Streaming

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Rishabh Gehlot

PHP 8+ & Laravel 11 Master Track