Linux Administration/System Services/System Logging/Journalctl
Journalctl command allows to query the contents of the systemd journal/logs.
Configuration
edit/etc/systemd/journald.conf
Basic Commands
editjournalctl
[1] orjournalctl --no-pager
journalctl -r
(reverse order)- journalctl -k : Show only kernel messages
journalctl -f
(follow)journalctl -u service-name.service
journalctl -u libvirtd
journalctl --verify
- Disk Usage/Logging:
journalctl --disk-usage
journalctl --vacuum-size=200M
[2]- --vacuum-size=BYTES Reduce disk usage below specified size
- --vacuum-files=INT Leave only the specified number of journal files
- --vacuum-time=TIME Remove journal files older than specified time
journalctl --list-boots
. See also:last (command)
See also
edit- systemd and related daemons:
systemd
,systemd-journald
,systemd-logind
,systemd-networkd
(networkctl),systemd-timesyncd
,systemd-resolved
andsystemd-udevd
[3] /etc/inittab
[4] andrespawn
option[5]systemctl
- launchd init and operating system service management daemon for MacOS