root@ip-XXXXXXXXXX:/home/ubuntu# systemctl status pm2-ubuntu.service
● pm2-ubuntu.service - PM2 process manager
   Loaded: loaded (/etc/systemd/system/pm2-ubuntu.service; enabled; vendor preset: enabled)
   Active: failed (Result: protocol) since Wed 2019-01-16 17:15:25 UTC; 5s ago
     Docs: https://pm2.keymetrics.io/
  Process: 1686 ExecStart=/usr/lib/node_modules/pm2/bin/pm2 resurrect (code=exited, status=0/SUCCESS)

Jan 16 17:15:25 ip-XXXXXXXXXX pm2[1686]: [PM2] Restoring processes located in /home/ubuntu/.pm2/dump.pm2
Jan 16 17:15:25 ip-XXXXXXXXXX pm2[1686]: ┌──────────┬────┬─────────┬──────┬──────┬────────┬─────────┬────────┬─────┬───────────┬──────┬──────────┐
Jan 16 17:15:25 ip-XXXXXXXXXX pm2[1686]: │ App name │ id │ version │ mode │ pid  │ status │ restart │ uptime │ cpu │ mem       │ user │ watching │
Jan 16 17:15:25 ip-XXXXXXXXXX pm2[1686]: ├──────────┼────┼─────────┼──────┼──────┼────────┼─────────┼────────┼─────┼───────────┼──────┼──────────┤
Jan 16 17:15:25 ip-XXXXXXXXXX pm2[1686]: │ index    │ 0  │ 1.0.0   │ fork │ 1394 │ online │ 0       │ 113s   │ 0%  │ 41.1 MB   │ root │ disabled │
Jan 16 17:15:25 ip-XXXXXXXXXX pm2[1686]: └──────────┴────┴─────────┴──────┴──────┴────────┴─────────┴────────┴─────┴───────────┴──────┴──────────┘
Jan 16 17:15:25 ip-XXXXXXXXXX pm2[1686]:  Use `pm2 show <id|name>` to get more details about an app
Jan 16 17:15:25 ip-XXXXXXXXXX systemd[1]: pm2-ubuntu.service: Can't open PID file /home/ubuntu/.pm2/pm2.pid (yet?) after start: No such file or directory
Jan 16 17:15:25 ip-XXXXXXXXXX systemd[1]: pm2-ubuntu.service: Failed with result 'protocol'.
Jan 16 17:15:25 ip-XXXXXXXXXX systemd[1]: Failed to start PM2 process manager.