[cgmanager-devel] /sys/fs/cgroup/cgmanager does not exist in a container

[Serge Hallyn]

Quoting Andy Johnson (johnsonzjo at gmail.com):
> Hello,
> I know that from containers you should better use cgproxy.
> I was just wondering:
> In a host I run cgmanager (taken from most recent git)
> Now, I have on the host
> /sys/fs/cgroup/cgmanager/
> and also /sys/fs/cgroup/cgmanager/sock
> I start a container from the host (Fedora container)
> I do not see /sys/fs/cgroup/cgmanager/ and /sys/fs/cgroup/cgmanager/sock

How did you create the container?  If using lxc-create+lxc-start,
then you need to add the line

lxc.mount.auto = cgroup

to the container configuration file.  Alternatively you can do

lxc.mount.entry = sys/fs/cgroup/cgmanager /sys/fs/cgroup/cgmanager \
	none bind,create=dir 0 0

> What, in fact, is the reason for this ? I see by running "mount" from
> the container that /sys/fs/cgroup is mounted as rw:
> 
> mount | grep  /sys/fs/cgroup
> ...
> tmpfs on /sys/fs/cgroup type tmpfs (rw,nosuid,nodev,noexec,mode=755
> ...
> 
> And the container is created and run as root from the host.
> regards,
> Andy
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