PM2
What is PM2
PM2 is a robust process manager for Node.js applications, offering a seamless way to handle the lifecycle of your Node.js processes. Much like a conductor leading an orchestra, PM2 orchestrates your Node.js applications with finesse.
Designed for simplicity and efficiency, PM2 empowers you to deploy, manage, and scale your Node.js applications effortlessly. Whether you’re running a web server, a background worker, or any Node.js process, PM2 ensures they stay up and running.
A managed process with PM2 is akin to a well-choreographed performance, ensuring reliability and continuous availability. PM2’s monitoring capabilities keep a watchful eye on your processes, automatically restarting them in case of failures.
PM2 is your silent guardian in the Node.js ecosystem, quietly ensuring the smooth operation of your applications. It’s your go-to tool for handling Node.js processes efficiently, making it an invaluable asset for developers seeking reliability and ease of management.
How to install pm2
Install the pre-requsite packages
sudo apt install nodejs npm
Install the pm2
npm install pm2 -g
How set ut nvm with pm2
1. Install and manage node.js with nvm
a) make sure nvm is installed
b) install the required versions of nodejs, e.i 16
nvm install 16
c) create a .nvmrc file in each project directory. Using version 18.19.0 would then be
echo "v18.19.0" > .nvmrc
2. Configure pm2 to Use a specific node version. cd into the project folder
a)
nvm user
pm2 start index.js --name labelofappname
Note:Entry point file usually is index.js. This info should be present in package.json
Commands
| DESCRIPTION | COMMAND |
|---|---|
| List process list |
pm2 pm2 status |
| Stop a running instance | pm2 stop [id] |
| Restart a running instance | pm2 restart [id] |
| Start a node instance | pm2 start app.js |
| Start a node instance with a custom name (better) | pm2 start app.js --name "nameofapp" |
| Start a process in stopped state | pm2 start app.js --name my-app --no-autorestart |
| Set environment variables for the process | pm2 start app.js --name my-app --env production |
| Delete/Remove an instance from process list | pm2 delete [id] |
| Delete/Remove all instance from process list | pm2 delete all |
| Monitor running processes | pm2 monit |