where is the log of mon?

[vieyahn2017]

[root@node1 mon]# cat vitastor-mon.service
[Unit]
Description=Vitastor monitor
After=network-online.target local-fs.target time-sync.target
Wants=network-online.target local-fs.target time-sync.target

[Service]
Restart=always
ExecStart=node /usr/lib/vitastor/mon/mon-main.js
WorkingDirectory=/

run:
journalctl -xeu vitastor-mon.service
-- No entries --

[vitalif]

journalctl -u vitastor-mon is the correct command, yeah. Check systemctl status vitastor-mon, maybe it just doesn't start in your case