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What is PM2 and why use it for Node.js on VPS?

PM2 is a process manager for Node.js applications. It keeps your app running after crashes, restarts on reboot, enables zero-downtime reloads, and provides log management. Install on Connect Quest VPS: `npm install pm2 -g`, start app: `pm2 start app.js --name myapp`, auto-start: `pm2 startup` and `pm2 save`.

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