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Re: [Libcg-devel] [libvirt]: Not able to login to container when cgroup is enabled



On Wed, Oct 07, 2009 at 03:53:56PM +0100, Daniel P. Berrange wrote:
> On Wed, Oct 07, 2009 at 08:12:02PM +0530, Dhaval Giani wrote:
> > On Wed, Oct 07, 2009 at 06:57:48AM -0700, Dan Smith wrote:
> > > R> can you help me here ?
> > > 
> > > Probably not, I'm not familiar with cgconfig nor the latest cgroup
> > > support in libvirt.
> > > 
> > > R> 14:47:24.556: warning : qemudStartup:565 : Unable to create cgroup
> > > R> for driver: No such device or address
> > > 
> > > My guess is that this means you don't have the cgroup filesystem
> > > mounted, or it's mounted in a way that prevents libvirt from doing its
> > > work.  IIRC, there are things you can do to the system that require a
> > > reboot to undo.  If cgconfig is setting up the cgroups in such a way,
> > > you might need to reboot between stopping cgconfig and trying libvirt
> > > by itself.
> > > 
> > 
> > Or the cgroups are being setup in funny fashion. Rishi, what does your
> > config file look like?
> > 
> > > R> But when i start cgconfig service, then i am not able to open
> > > R> console for my container.
> > > 
> > > Again, knowing nothing of cgconfig, I can only speculate that it's
> > > doing something to prevent accessing the console pty.
> > > 
> > 
> > cgconfig does nothing apart from setup the cgroup filesystem as
> > mentioned in the configuration files.
> > 
> > > I would push on the libcgroup folks to help figure out what it's doing
> > > (either by default or with your config) to prevent that and then go
> > > from there.
> > > 
> > 
> > Would appreciate any help from the libvirt folks who have worked on the
> > cgroup support in libvirt.
> 
> The most likely suspect is that the cgroups controllers were mounted or
> unmounted after libvirtd started. A restart of libvirtd ought to resolve
> the problem if this is indeed the case
> 

If Rishi is using the cgconfig service to start it, at least in Fedora I
am aware of it starting early in the boot sequence. Rishi could you
confirm this please?

thanks,
-- 
regards,
Dhaval


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