How to rotate systemd-journald log under /var/log/journal/*/ or /run/log/journal/*/?

Environment

• Red Hat Enterprise Linux 7
• Red Hat Enterprise Linux 8

Issue

• How to rotate systemd-journald log under /var/log/journal/*/ ?
• Is it possible to control its behavior?

Resolution

• Journal log can be rotated without setting changes.

• It is set in /etc/systemd/journald.conf file.

• Useful parameters are as below:

  1. SystemMaxUse= and RuntimeMaxUse= control how much disk space the journal may use up at maximum. Default to 10% of the respective file system size.
  2. SystemKeepFree= and RuntimeKeepFree= control how much disk space systemd-journald shall always leave free for other uses. Default to 15% of the respective file system size. The systemd-journald will respect both limits, but use the smaller value.

• Refer to man 5 journald.conf for more details.

• How to enable persistent logging for the systemd journal

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