[systemd-devel] Journal, rotation and loglevels

D.S. Ljungmark spider at aanstoot.se
Tue Dec 2 02:31:33 PST 2014

On 24/10/14 00:47, Lennart Poettering wrote:
> On Thu, 23.10.14 17:19, D.S. Ljungmark (spider at aanstoot.se) wrote:
>> On 23/10/14 16:50, Lennart Poettering wrote:
>>> On Thu, 23.10.14 15:27, D.S. Ljungmark (spider at aanstoot.se) wrote:
>>>> Hi,
>>>>   we have a few services that are spamming a fair bit on DEBUG level of
>>>> log output. In syslog, we'd separate the DEBUG logs from the main log,
>>>> and set the rotation of DEBUG+ to be ~24 hours, while keeping INFO and
>>>> above for ~4 weeks.
>>>> How can we do something similar with Journald?
>>> No, currenty you cannot. You can turn off storage from a certain log
>>> level on (MaxLevelStore=), but you cannot change the retention time
>>> per log level yet.
>> So if we set MaxLevelStore=INFO, we won't get the journal on disk
>> stored. How much is stored in memory and how do you control that
>> amount?
> MaxLevelStore= controls what hits /run+/var, it makes not distinction
> there. If you set MaxLevelStore= then this means debug messages get
> dropped entirely.
>> Right now, we don't store anything to disk ( no persistent disk in the
>> system ) and why we're asking is that our DEBUG logs flushed the errors
>> & warnings from last night, and we have no idea what actually went
>> wrong.   Before this, we were storing things (syslogd) but after
>> migrating to journald, we didn't figure out how to get them saved
>> properly, so it's been punted onto the very long TODO list by us as well.
>> Can I get a journal of ~50M (compressed?) stored on disk with Info and
>> above levels, and then another 50M of debug+above in RAM?
> Nope, this is currently not supported, but support a scheme like this
> is on the TODO list.

Thank you, then I'll just wait.


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