Difference between revisions of "Journalctl"

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* <code>journalctl -k</code>: Show only [[kernel]] messages
 
* <code>journalctl -k</code>: Show only [[kernel]] messages
 
* <code>journalctl -f</code> (follow)
 
* <code>journalctl -f</code> (follow)
* <code>journalctl -u [[service-name]].service</code>
+
* <code>[[journalctl -u]] [[service-name]].service</code>
 
::: <code>journalctl -u [[sshd|ssh]]</code> (See also [[sshd logs]])
 
::: <code>journalctl -u [[sshd|ssh]]</code> (See also [[sshd logs]])
 
:: <code>-u unit_name</code>
 
:: <code>-u unit_name</code>

Revision as of 15:17, 25 December 2019

journalctl command allows to query the contents of the systemd journal/logs.

Configuration

Basic Commands

journalctl -u ssh (See also sshd logs)
-u unit_name
journalctl -u service-name.service -f
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)
  • journalctl -xb
-x --catalog Includes explanations in log lines from message catalgog
-b show message from current boot. if [ID] is provided will show messages from that specific boot.

See also

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Source: https://en.wikiversity.org/wiki/Linux_Administration/System_Services/System_Logging/Journalctl

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