8. PM2, the Node.js Process Manager

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Uses for PM2



PM2 has a lot of uses, let’s look at a few:

  • Restarting after crashes: PM2 allows us to keep processes running until the heat death of the universe, or a server failure, whichever happens first
  • Monitoring and managing processes remotely: A magic-powered web portal allows you to keep an eye on remote processes and manage them
  • It doesn’t just run Node apps: PM2 isn’t limited to just Node.js processes, that’s right, you can even use it to keep your Minecraft server online
  • Restart-Persistance: PM2 can remember all your processes and restart them after a system restart
  • And a whole lot more

Getting started

First thing we need to do is to install PM2 globally on your machine:

$ npm i -g pm2

Basic Commands

Let’s get into the basics of how to use it. To start a process under PM2, all you have to do is run pm2 start <app>. App being the name of the file you’re running. PM2 will output something like this:

[PM2] Starting C:\Users\moose\app.js in fork_mode (1 instance)
[PM2] Done.
┌──────────┬────┬
│ App name │ id │
├──────────┼────|
│ app      │ 0  │
└──────────┴────|

Reduced and simplified for brevity

Pay attention to what it says under id. If you forget just run pm2 list. If you want to add a name to the process when you start it, you can use the --name parameter (pm2 start app.js --name mycoolapp). Awesome! Your app is now running under PM2, if it crashes, PM2 will restart it.

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