[libvirt-users] RHEL6 cgroup error after a few days of uptime

David Cruz david.cruz at gigas.com
Thu Dec 13 21:43:00 UTC 2012


What i did on our test environment.

cggroup clear
/etc/init.d/cgred stop
/etc/init.d/cgconfig stop

/etc/init.d/libvirtd restart

And everything got back to normal.

David

2012/12/13 Daniel P. Berrange <berrange at redhat.com>:
> On Thu, Dec 13, 2012 at 01:31:27PM -0700, Dax Kelson wrote:
>> I have a RHEL6 that hosts many kvm virtual machines. It has been
>> working fine for a couple years. I apply errata updates about once a
>> week.
>>
>> In the last couple weeks, I've ran into a bug where the virtual
>> machines start failing to start with a cgroup error message. If I
>> reboot the host (very disruptive) then things start working normaly
>> for a few days.
>
> Sounds like something has either unmounted your cgroups, or
> deleted the directories that libvirt created. I wonder if the
> cgconfig initscript is doing it perhaps, and getting triggered in
> a %post from an RPM script. In any case, you ought not need to
> reboot the host - restarting libvirtd will get it to re-create
> its cgroups.
>
>> Can I configure qemu/libvirt not to use cgroups at all as a temporary
>> workaround? How would I do that?
>
> Simply don't mount any on the host and libvirt won't use them.
> On RHEL6, the 'cgconfig' initscript is what mounts them at boot.
>
> Daniel
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