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Finding and Reducing Journal Disk Usage

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Ray Woodcock

In Ubuntu 22.04.3 LTS, I ran Disk Usage Analyzer on the root directory. It indicated that /var/log/journal occupied 3.8GB. In response, I ran sudo gedit /etc/systemd/journald.conf and changed two lines: 25 SystemMaxUse=100M and 33 MaxRetentionSec=1week. Then I ran sudo systemctl restart systemd-journald. I rebooted and refreshed Disk Usage Analyzer. The situation remained the same. It appeared that my efforts accomplished nothing.

I didn't run journalctl --disk-usage before those edits to journald.conf. I did run it afterwards. It said, "Archived and active journals take up 64.0M in the file system." Possibly my changes to journald.conf contributed to that relatively low value of 64.0M. In any event, that 64.0M figure seemed incompatible with the results of Disk Usage Analyzer.

Were Disk Usage Analyzer and journalctl --disk-usage providing information on different aspects of the system? Was Disk Usage Analyzer identifying a large amount of material that I could have reduced, so as to make more space on the drive?

I used BleachBit before taking any of these steps: was it perhaps the reason for the relatively low space usage indicated by journalctl --disk-usage? I included most BleachBit options, excepting only those whose warnings mentioned instability or went beyond "slow" to "very slow" - for instance, I didn't use its option to clean free disk space.

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Andrew
In BleachBit did you use the tool to clean free disk space? This is the one that can take hours.
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