this post was submitted on 01 Aug 2024
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Cleanup
Check current disk usage:
sudo journalctl --disk-usage
Use rotate function:
sudo journalctl --rotate
Or
Remove all logs and keep the last 2 days:
sudo journalctl --vacuum-time=2days
Or
Remove all logs and only keep the last 100MB:
sudo journalctl --vacuum-size=100M
How to read logs:
Follow specific log for a service:
sudo journalctl -fu SERVICE
Show extended log info and print the last lines of a service:
sudo journalctl -xeu SERVICE
Actually something I never dug into. But does logrotate no longer work? I have a bunch of disk space these days so I would not notice large log files
If logrotate doesn't work, than use this as a cronjob via
sudo crontab -e
Put this line at the end of the file:0 0 * * * journalctl --vacuum-size=1G >/dev/null 2>&1
Everyday the logs will be trimmed to 1GB. Usually the logs are trimmed automatically at 4GB, but sometimes this does not work
If we're using systemd already, why not a timer?
Cron is better known than a systemd timer, but you can provide an example for the timer 😃
Really, the correct way would be to set the limit you want for journald. Put this into
/etc/systemd/journald.conf.d/00-journal-size.conf
:Or something like this using a timer:
systemd-run --timer-property=OnCalender=daily $COMMAND
Thanks for this addition ☺️