Daemonize with pm2
$ pm2 start app.js
$ pm2 startup systemd -u pi
(Related: PM2 Raspberry Jessie - Not spawning on boot · Issue #1654 · Unitech/pm2)
$ pm2 start app.js
$ pm2 startup systemd -u pi
(Related: PM2 Raspberry Jessie - Not spawning on boot · Issue #1654 · Unitech/pm2)