jourtnalctl
cheat sheet
Configuration
/etc/systemd/journald.conf
Show Service Log
journalctl --no-pager -u _service-name_
Show events since the last boot
journalctl -b
Show today events
journalctl --since=today
Show (follow) current events
journalctl -f
Control log size
Retain only the past two days:
journalctl --vacuum-time=2d
Retain only the past 500 MB:
journalctl --vacuum-size=500M