pm2 등록

$ pm2 start ./file_name --name test
$ pm2 list

pm2 startup

$ pm2 startup
Output
[PM2] Init System found: systemd
[PM2] To setup the Startup Script, copy/paste the following command:
sudo env PATH=$PATH:/usr/bin /usr/lib/node_modules/pm2/bin/pm2 startup systemd -u sammy --hp /home/sammy


$ sudo env PATH=$PATH:/usr/bin /usr/lib/node_modules/pm2/bin/pm2 startup systemd -u sammy --hp /home/sammy 

$ pm2 save
$ sudo systemctl start pm2-sammy.service // sammy에 설정한 서비스이름
$ systemctl status pm2-sammy.service // 위와 동일

$ sudo reboot

reboot 후 서비스 확인

출처

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-18-04

https://github.com/Unitech/pm2/issues/3924