How to Install PM2 on AlmaLinux 9

To install PM2, a process manager for Node.js applications, on AlmaLinux 9, follow the steps below:

Step 1 : Install PM2

First, make sure you have Node.js and npm installed. Then, install PM2 globally using npm:

npm install -g pm2

Step 2 : Run PM2 Startup Script

To ensure PM2 starts automatically on system reboot, run the following command:

pm2 startup

Step 3 : Build a Simple Node.js App

Create a simple Node.js application file, for example, app.js:

const http = require('http');

const server = http.createServer((req, res) => {
    res.writeHead(200, { 'Content-Type': 'text/plain' });
    res.end('Hello, PM2 on AlmaLinux 9!');
});

server.listen(3000, () => {
    console.log('Server is running on port 3000');
});

Step 4 : Start the App with PM2

Start the application using PM2:

pm2 start app.js

You can check the running processes with:

pm2 list

Step 5 : Manage Applications with PM2

PM2 allows you to manage applications easily:

- Restart the app:

pm2 restart app.js

- Reload the app (zero-downtime):

pm2 reload app.js

- Stop the app:

pm2 stop app.js

- Delete the app from PM2:

pm2 delete app.js

Congratulations! You have successfully installed PM2 on AlmaLinux 9