Free up Disk Space – Clear Systemd Journal Logs in Ubuntu 20.04 | 22.04

Going to free up Ubuntu system disk space? Try clearing the systemd journal logs, it may free up a few GB of space.

By using the Disk Usage Analyzer tool, I found that /var/log/journal takes more than 4 GB system space in my Ubuntu 20.04.

Systemd has its own logging system called the journal, and the log files are stored in /var/log/journal. As long as I don’t need the logs for any debugging, it’s safe to delete these files. And following steps will show you how.

1. First open terminal from system app launcher, and you may run command to check out the current disk usage of all journal files:

journalctl --disk-usage

2. If you decide to clear the logs, run command to rotate the journal files. All currently active journal files will be marked as archived, so that they are never written to in future.

sudo journalctl --rotate

3. Now clear the journal logs by choosing one of following commands:

Delete journal logs older than X days:
```
sudo journalctl --vacuum-time=2days
```
Delete log files until the disk space taken falls below the specified size:
```
sudo journalctl --vacuum-size=100M
```
Delete old logs and limit file number to X:
```
sudo journalctl --vacuum-files=5
```

4. You can also edit the configuration file to limit the journal log disk usage (100 MB for example).

Run command in terminal to edit the file via Gedit text editor (For 23.04+, replace gedit with gnome-text-editor):

sudo -H gedit /etc/systemd/journald.conf

When the file opens, un-comment (remove # at the beginning) the line #SystemMaxUse= and change it to SystemMaxUse=100M.

Save the file and reload systemd daemon via command:

systemctl daemon-reload

That’s all, Enjoy!

Ji m

Twitter

I'm a freelance blogger who started using Ubuntu in 2007 and wishes to share my experiences and some useful tips with Ubuntu beginners and lovers. Please comment to let me know if the tutorial is outdated! And, notify me if you find any typo/grammar/language mistakes. English is not my native language. Contact me via [email protected] Buy me a coffee: https://ko-fi.com/ubuntuhandbook1

14 responses to Free up Disk Space – Clear Systemd Journal Logs in Ubuntu 20.04 | 22.04

BollYogi January 22, 2021 at 6:21 pm

Thanks Ji m! Very useful to clear extra space !!
GreyGeek April 23, 2021 at 2:31 pm

Thanks for sharing a very clear set of steps!
Ken Wood May 24, 2021 at 6:50 am

Thanks for that dude. You’re awesome, it’s not true at all what they say about you.
Steve Wei October 10, 2021 at 11:35 am

Thanks for sharing the know-how!

Since this journald has little usage for an ordinary user,
why not make it disable by default?
John November 2, 2021 at 10:23 am

I have been 2 days trying to release disk space. I appreciate your post.
Benjamin Daaki November 17, 2021 at 2:13 am

This helped me lots. Thanks may God bless you
Nils December 20, 2021 at 1:42 pm

Hi,
Thanks for your tricks, what is happening if the journal is raising up to 100 MB despite of the “SystemMaxUse=” defined to “100M”. Is it removed?
Thanks
Juan J. Martinez January 11, 2022 at 11:12 am

Thanks for sharing.
Sergiy A. February 11, 2022 at 9:59 am

Thanks!
Cool tips!
Esneyder March 1, 2022 at 4:54 pm

Thanks a ton! very useful tips!
Alan Ng March 11, 2022 at 2:50 pm

Very informational. Thank you.
Wozza Xing March 24, 2022 at 8:47 am

Thanks a lot

I couldn’t send emails from Thunderbird because the disk was full.

You have helped me. Thanks.

Dave January 14, 2023 at 2:42 pm

Here is what I do to clean up journal files, saved in file to copy and paste.

#Clean-up Journal files
Journalctl --disk-usage
sudo journalctl --rotate
sudo journalctl --vacuum-size=10M --vacuum-size=1s
sudo nano /etc/systems/journal.conf
#SystemMaxUse=50M
sudo systemctl restart systemd-journald.conf