[systemd-devel] Delete stale *.journal-files from containers

[Peter Paule]

Hi,

I use `docker` to run containers. Each container uses `systemd` as PID  
1. I pass `-v /var/log/journal:/var/log/journal` to `docker run` to  
accumulate journals on the docker host. Every time a container is  
started, a new journal file is generated based on the machine-id,  
leaving quite a few 8MiB-`system.journal`-files on the system after  
the container was "stopped".

Example:

~~~
docker run --name centos-1 --rm -ti -v /sys/fs/cgroup:/sys/fs/cgroup  
-v /var/log/journal:/var/log/journal feduxorg/centos
~~~

Is there way beside `find /var/log/journal -time +30 -delete` to get  
rid of stale old `journal`.files? I tried `MaxRetentionSec=1day` and  
`MaxTimeSec=1day`, but none of this made `systemd-journald` to delete  
the `system.journal`-files.

Thanks a lot.

Cheers,

Peter Paule