[systemd-devel] systemd-journald: prioritize system log over user log

Yunchih Chen yunchih at csie.ntu.edu.tw
Thu Mar 23 11:13:39 UTC 2017

On 03/23/2017 06:29 PM, Michael Chapman wrote:
> On Thu, 23 Mar 2017, Yunchih Chen wrote:
>> Hello:
>>    At my organization, there can be hundreds of user logins in a 
>> public workstation each day, among more than one thousand of users.  
>> Since each user login produces a 8MiB sparse log file in 
>> /var/log/journal/xxxxx/, significant disk space is consumed. From the 
>> administrator point of view, it is desirable to prioritize system log 
>> over user log.  For example, when total log size exceeds 
>> SystemMaxUse, user log is vacuumed / rotated before system log.  Can 
>> we achieve this goal under current implementation?
> I don't think journald has support for that itself currently.
> Have you considered using SplitMode=none in journald.conf? If you do 
> that the per-UID journal files will not be created. Instead, all 
> messages will go into the system journal.
> Of course, using SplitMode=none does mean unprivileged users probably 
> won't be able to view their own logs, but it does mean you won't get 
> this per-UID overhead.
Thanks for your reply.  But we actually intend to let users view their 
own logs and we don't like to pollute system log with user log.  Maybe 
consider my original proposal as a feature request?


Yun-Chih Chen 陳耘志
Network/Workstation Assistant
Dept. of Computer Science and Information Engineering
National Taiwan University
Tel: +886-2-33664888 ext. 217/204
Email: ta217 at csie.ntu.edu.tw
Website: http://wslab.csie.ntu.edu.tw/

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