Useful commands

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journalctl -xe -f
sudo journalctl --rotate
sudo journalctl --vacuum-time=1s

--since "2019-01-30 14:00:00"
--since today

Configuration

Size

You can set this in /etc/systemd/journald.conf like so:

SystemMaxUse=100M

This will be enforced on the next reboot or restart of the journald service:

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$ systemctl restart systemd-journald