Find the current Disk Usage by journalctl
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journalctl --disk-usage
The safest way to remove unessesary entries is via the (means leave this amount left)
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journalctl --vacuum-size=512M
After that you can verify if everything is still intact:
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journalctl --verify
Or as generell setting in /etc/systemd/journald.conf
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SystemMaxUse=512M
different approach:
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SystemMaxFileSize=12M
SystemMaxFiles=10