[systemd-devel] How to use cgroups within containers?

Richard Weinberger richard at nod.at
Mon Oct 20 16:49:10 UTC 2014


Am 20.10.2014 um 18:24 schrieb Lennart Poettering:
> On Fri, 17.10.14 23:35, Richard Weinberger (richard.weinberger at gmail.com) wrote:
> 
>> Dear systemd and container folks,
>>
>> at Plumbers the question raised how to provide cgroups to a systemd that lives
>> in a container (with user namespaces).
>> Due to the GDL train strikes I had to leave very soon and had no chance to
>> talk to you in person.
>>
>> Was a solution proposed?
>> All I want to know is how to provide cgroups in a sane and secure way
>> to systemd. :-)
> 
> The cgroups setup systemd requires to be able to run cleanly without
> changes in a container is documented here:
> 
> http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/
> 
> You have to mount the full cgroupfs hierarchies into the containers,
> so that /proc/$PID/cgroup makes sense inside the containers (that file
> lists absolute paths...). They can be mounted read-only up to the
> container's root, but further down they need to be writable to the
> container, so that systemd inside the container can do its job.

And what solution do you propose?
Will cgroup namespaces make systemd finally happy?

Thanks,
//richard


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