From man page of Journald.conf I came to know that, by default Journal use 10% of file system size for storing journal files.

I have configured below values in journald.conf.


I have not specified any units for

RuntimeMaxUse attribute

How journal treats this value?

one more question below

Is there anyway to specify in journald.conf file to use 30% of the filesystem size for journal files?

For the above configuration, I could see below results on my system

-rw-r-----+ 1 root root 904M Jul 14 14:11 system@63691df841d14d4795850417936c799e-0000000006cdd9d1-0005379686115fe8.journal
-rw-r-----+ 1 root root 904M Jul 14 14:14 system@63691df841d14d4795850417936c799e-0000000006e30c11-00053796905a72d8.journal
-rw-r-----+ 1 root root 120M Jul 14 14:14 system.journal

Two files created with approximately 1G each and third file can grow upto 1G and after that oldest journal files gets deleted.

For one more configuration below,


Even though i specified RuntimeMaxUse as 2G, I could see journal uses 3G of file system size. i.e

1) file1 -- system@*********************** - 1G
2) file2 -- system@*********************** - 1G
3) file3 -- system.journal                 - Reaches upto 1G

Is my understanding correct?

Please clarify.


No, you cannot specify a percentage value for RuntimeMaxUse or any other storage option from journald.conf as Jan Synacek explains here:

The values are not specified in percentages, they are specified in absolute values followed by a unit. The percentages mentioned in the manpage are applied only if the user specifies no value for a given option.

So only absolute values followed by a unit will work.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.