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when I am using this command to see the journal log size of CentOS 7:

journalctl --disk-usage

the output looks like this:

[root@k8smasterone log]# journalctl --disk-usage
Archived and active journals take up 48.0M on disk.

but the /var/log/messages file has a size of more than 4 GB, why does journalctl not show the same size of the log? The messages should be treated as journal log.

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  • The messages should be treated as journal log - why? ;-) journald works with /var/log/journal exclusively. Other files and directories under /var/log aren't its concern. Commented May 19, 2022 at 12:12

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journalctl only concerns itself with the systemd journal, normally stored in /run/log/journal and /var/log/journal.

Other files in /var/log aren’t part of the systemd journal and aren’t counted by journalctl --disk-usage.

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