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| − | Journalctl command allows to query the contents of the [[systemd]] journal/[[logs]].
| + | #redirect [[journalctl]] |
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| − | == Configuration ==
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| − | * <code>/etc/systemd/journald.conf</code>
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| − | == Basic Commands ==
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| − | * <code>journalctl</code><ref>https://www.freedesktop.org/software/systemd/man/journalctl.html</ref> or <code>journalctl --no-pager</code>
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| − | * <code>journalctl -r</code> (reverse order)
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| − | * journalctl -k : Show only [[kernel]] messages
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| − | * <code>journalctl -f</code> (follow)
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| − | * <code>journalctl -u service-name.service</code>
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| − | :<code>journalctl -u [[kVM/libvirt|libvirtd]]</code>
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| − | * <code>journalctl --verify</code>
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| − | * Disk Usage/Logging: <code>[[/journalctl --disk-usage/]]</code>
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| − | * <code>journalctl --vacuum-size=200M</code><ref>https://askubuntu.com/a/1012913</ref>
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| − | **--vacuum-size=BYTES Reduce disk usage below specified size
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| − | **--vacuum-files=INT Leave only the specified number of journal files
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| − | **--vacuum-time=TIME Remove journal files older than specified time
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| − | * <code>journalctl --list-boots</code>. See also: <code>last (command)</code>
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| − | ==See also==
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| − | * [[systemd]] and related daemons: <code>systemd</code>, <code>systemd-journald</code>, <code>systemd-logind</code>, <code>systemd-networkd</code> ([[systemd/networkctl|networkctl]]), <code>systemd-timesyncd</code>, <code>systemd-resolved</code> and <code>systemd-udevd</code><ref>https://wiki.ubuntu.com/DebuggingSystemd</ref>
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| − | * <code>/etc/[[inittab]]</code><ref>https://linux.die.net/man/5/inittab</ref> and <code>respawn</code> option<ref>https://superuser.com/questions/507576/how-to-automatically-restart-a-linux-background-process-if-it-fails</ref>
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| − | * <code>[[systemctl]]</code>
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| − | * [[launchd]] init and operating system service management daemon for [[MacOS]]
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| − | {{CC license}}
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| − | Source: https://en.wikiversity.org/wiki/Linux_Administration/System_Services/System_Logging/Journalctl
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