/var/log/journal taking up lots of space

 If /var/log/journal is taking up too much space, you can clear it and prevent it growing too big again.

Prevention:

vi /etc/systemd/journald.conf 

Look for:

SystemMaxUse=2000M

Or similar, and set it to a lower value

Then:

service systemd-journald restart

Clearing once-off:

journalctl --vacuum-time=2d

assuming for example you want to clear everything before two days ago.

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