PM2 vs Docker: Which One Should You Use?

If you're deploying a Node.js or Next.js app, you may wonder whether to use PM2 or Docker.

The short answer:

PM2 manages your application process. Docker manages your application environment.

---

PM2

PM2 is a process manager for Node.js applications.

It's useful when you want to:

• Keep your app running

• Automatically restart crashed apps

• Manage logs

• Restart apps after server reboot

• Run multiple Node.js applications

Example:

bash
pm2 start npm --name "my-app" -- start

Check your app:

bash
pm2 status

View logs:

bash
pm2 logs

Best for

Simple VPS deployments, especially when you're running Next.js or Node.js directly on the server.

Docker

Docker packages your application and its dependencies inside a container.

For example:

text
Docker Container
├── Node.js
├── Next.js
├── Dependencies
└── Application

Docker is useful when you need:

• Isolated environments

• Consistent deployments

• Multiple services

• Easier CI/CD

• Different Node.js versions for different apps

Best for

Larger or multi-service applications where environment consistency and isolation matter.

PM2 vs Docker

Feature	PM2	Docker
Main purpose	Process manager	Containerization
Setup	Easy	More involved
VPS apps	⭐⭐⭐⭐⭐	⭐⭐⭐⭐
Isolation	❌	✅
CI/CD	Good	Excellent
Multiple services	Good	Excellent
Learning curve	Easy	Moderate

Which One Should You Use?

Choose PM2 if:

text
Small/medium project
       ↓
Single VPS
       ↓
Next.js / Node.js
       ↓
Simple deployment
       ↓
PM2

Choose Docker if:

text
Multiple services
       ↓
Need isolation
       ↓
CI/CD
       ↓
Reproducible environments
       ↓
Docker

Can You Use Both?

Yes.

But you don't always need both.

For most simple VPS deployments:

Nginx → PM2 → Next.js

is more than enough.

For containerized infrastructure:

Nginx → Docker → Next.js

is usually cleaner.

---

Final Verdict

Use PM2 if you want a simple and lightweight Node.js/Next.js deployment.

Use Docker if you need containerization, isolation, multiple services, or more advanced CI/CD.

PM2 = Process Management
Docker = Container Management

Choose based on your project's needs - not which tool sounds more advanced.