install PM

npm install pm2 -g

run project

pm2 start index.js

List Process

pm2 list

Stop Process

pm2 stop app_name / process index

pm2 stop 0

Restart on file changes

pm2 start app.js –watch

Logs

root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# ls Procfile app.json index.js package-lock.json public views README.md backup-gps node_modules package.json test.js root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# sudo npm install pm2@latest -g sudo: npm: command not found root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# npm install npm WARN EBADENGINE Unsupported engine { npm WARN EBADENGINE package: ‘node-js-getting-started@0.3.0’, npm WARN EBADENGINE required: { node: ‘14.x’ }, npm WARN EBADENGINE current: { node: ‘v19.3.0’, npm: ‘9.2.0’ } npm WARN EBADENGINE }

up to date, audited 201 packages in 3s

45 packages are looking for funding run npm fund for details

10 vulnerabilities (1 moderate, 7 high, 2 critical)

To address all issues, run: npm audit fix

Run npm audit for details. root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# npm install pm2 -g npm WARN deprecated uuid@3.4.0: Please upgrade to version 7 or higher. Older versions may use Math.random() in certain circumstances, which is known to be problematic. See https://v8.dev/blog/math-random for details.

changed 184 packages in 14s

12 packages are looking for funding run npm fund for details root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 start index.js

In-memory PM2 is out-of-date, do: $ pm2 update In memory PM2 version: 5.2.2 Local PM2 version: 5.3.0

[PM2][ERROR] Script already launched, add -f option to force re-execution root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 start index.js -f

In-memory PM2 is out-of-date, do: $ pm2 update In memory PM2 version: 5.2.2 Local PM2 version: 5.3.0

[PM2] Starting /var/www/html/socket/index.js in fork_mode (1 instance) [PM2] Done. ┌────┬────────────────────┬──────────┬──────┬───────────┬──────────┬──────────┐ │ id │ name │ mode │ ↺ │ status │ cpu │ memory │ ├────┼────────────────────┼──────────┼──────┼───────────┼──────────┼──────────┤ │ 0 │ index │ fork │ 0 │ stopped │ 0% │ 0b │ │ 1 │ index │ fork │ 12 │ online │ 0% │ 48.6mb │ │ 2 │ index │ fork │ 0 │ online │ 0% │ 15.1mb │ └────┴────────────────────┴──────────┴──────┴───────────┴──────────┴──────────┘ [PM2][WARN] Current process list is not synchronized with saved list. Type ‘pm2 save’ to synchronize. root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 stop 1

In-memory PM2 is out-of-date, do: $ pm2 update In memory PM2 version: 5.2.2 Local PM2 version: 5.3.0

[PM2] Applying action stopProcessId on app [1](ids: [ ‘1’ ]) [PM2] index ✓ ┌────┬────────────────────┬──────────┬──────┬───────────┬──────────┬──────────┐ │ id │ name │ mode │ ↺ │ status │ cpu │ memory │ ├────┼────────────────────┼──────────┼──────┼───────────┼──────────┼──────────┤ │ 0 │ index │ fork │ 0 │ stopped │ 0% │ 0b │ │ 1 │ index │ fork │ 12 │ stopped │ 0% │ 0b │ │ 2 │ index │ fork │ 0 │ online │ 0% │ 56.1mb │ └────┴────────────────────┴──────────┴──────┴───────────┴──────────┴──────────┘ [PM2][WARN] Current process list is not synchronized with saved list. Type ‘pm2 save’ to synchronize. root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 stop 2

In-memory PM2 is out-of-date, do: $ pm2 update In memory PM2 version: 5.2.2 Local PM2 version: 5.3.0

[PM2] Applying action stopProcessId on app [2](ids: [ ‘2’ ]) [PM2] index ✓ ┌────┬────────────────────┬──────────┬──────┬───────────┬──────────┬──────────┐ │ id │ name │ mode │ ↺ │ status │ cpu │ memory │ ├────┼────────────────────┼──────────┼──────┼───────────┼──────────┼──────────┤ │ 0 │ index │ fork │ 0 │ stopped │ 0% │ 0b │ │ 1 │ index │ fork │ 12 │ stopped │ 0% │ 0b │ │ 2 │ index │ fork │ 0 │ stopped │ 0% │ 0b │ └────┴────────────────────┴──────────┴──────┴───────────┴──────────┴──────────┘ [PM2][WARN] Current process list is not synchronized with saved list. Type ‘pm2 save’ to synchronize. root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 list

In-memory PM2 is out-of-date, do: $ pm2 update In memory PM2 version: 5.2.2 Local PM2 version: 5.3.0

┌────┬────────────────────┬──────────┬──────┬───────────┬──────────┬──────────┐ │ id │ name │ mode │ ↺ │ status │ cpu │ memory │ ├────┼────────────────────┼──────────┼──────┼───────────┼──────────┼──────────┤ │ 0 │ index │ fork │ 0 │ stopped │ 0% │ 0b │ │ 1 │ index │ fork │ 12 │ stopped │ 0% │ 0b │ │ 2 │ index │ fork │ 0 │ stopped │ 0% │ 0b │ └────┴────────────────────┴──────────┴──────┴───────────┴──────────┴──────────┘ [PM2][WARN] Current process list is not synchronized with saved list. Type ‘pm2 save’ to synchronize. root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 kill

In-memory PM2 is out-of-date, do: $ pm2 update In memory PM2 version: 5.2.2 Local PM2 version: 5.3.0

[PM2] Applying action deleteProcessId on app all [PM2] index ✓ [PM2] index ✓ [PM2] index ✓ [PM2] [v] All Applications Stopped [PM2] [v] PM2 Daemon Stopped root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 list [PM2] Spawning PM2 daemon with pm2_home=/root/.pm2 [PM2] PM2 Successfully daemonized ┌────┬────────────────────┬──────────┬──────┬───────────┬──────────┬──────────┐ │ id │ name │ mode │ ↺ │ status │ cpu │ memory │ └────┴────────────────────┴──────────┴──────┴───────────┴──────────┴──────────┘ [PM2][WARN] Current process list is not synchronized with saved list. App index index differs. Type ‘pm2 save’ to synchronize. root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 start index.js [PM2] Starting /var/www/html/socket/index.js in fork_mode (1 instance) [PM2] Done. ┌────┬────────────────────┬──────────┬──────┬───────────┬──────────┬──────────┐ │ id │ name │ mode │ ↺ │ status │ cpu │ memory │ ├────┼────────────────────┼──────────┼──────┼───────────┼──────────┼──────────┤ │ 0 │ index │ fork │ 0 │ online │ 0% │ 39.7mb │ └────┴────────────────────┴──────────┴──────┴───────────┴──────────┴──────────┘ [PM2][WARN] Current process list is not synchronized with saved list. Type ‘pm2 save’ to synchronize. root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket#

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-20-04

https://www.codespeedy.com/remove-node-js-app-from-pm2-process-list/#:~:text=In%20order%20to%20delete%20a,Doing%20this%20is%20quite%20easy.&text=We%20can%20clearly%20see%20the,or%20remove%20the%20specific%20Node.

https://pm2.keymetrics.io/docs/usage/watch-and-restart/

root@ubuntu-s-1vcpu-2gb-nyc1-01:/var/www/html/socket# pm2 start index.js –watch [PM2] Starting /var/www/html/socket/index.js in fork_mode (1 instance) [PM2] Done. ┌────┬────────────────────┬──────────┬──────┬───────────┬──────────┬──────────┐ │ id │ name │ mode │ ↺ │ status │ cpu │ memory │ ├────┼────────────────────┼──────────┼──────┼───────────┼──────────┼──────────┤ │ 0 │ index │ fork │ 0 │ online │ 0% │ 44.1mb │ └────┴────────────────────┴──────────┴──────┴───────────┴──────────┴──────────┘ [PM2][WARN] Current process list is not synchronized with saved list. Type ‘pm2 save’ to synchronize.