Journalctl
Configuration
/etc/systemd/journald.conf
Basic Commands
journalctl[1] orjournalctl --no-pagerjournalctl -r(reverse order)journalctl -k: Show only kernel messagesjournalctl -f(follow)journalctl -u service-name.service
-u unit_namejournalctl -u service-name.service -fjournalctl -u libvirtdjournalctl -u ssh(See also sshd logs)
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)journalctl -xb
-x --catalogIncludes explanations in log lines from message catalgog-bshow message from current boot. if [ID] is provided will show messages from that specific boot.
Activities
- Review Libvirt error messages in journald
- Review No space left on device messages
See also
- Systemd:
systemctl,systemd-journald,journalctlsystemd-cat,systemd-logind,systemd-networkd:networkctl,systemd-timesyncd,systemd-resolved,systemd-udevd[3],Systemd-logind: loginctl,hostnamectl,udevadm,systemd-run,portablectl,systemd-nspawn, systemd resource management, Timer (systemd), systemd logs,/etc/systemd/, systemd services,systemd-mount,/run/systemd/,.service,/usr/lib/systemd/,/usr/lib/systemd/system/,/usr/lib/systemd/system/systemd-resolved.service,/lib/systemd/, machinectl, systemd-oomd, systemd-analyze /etc/inittab[4] andrespawnoption[5]- launchd init and operating system service management daemon for MacOS \
- journald:
journalctljournald.conf,journalctl --help,/dev/console - Linux logging, Cisco IOS logging
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Source: https://en.wikiversity.org/wiki/Linux_Administration/System_Services/System_Logging/Journalctl
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