[Users] Unable to run VM with ”opening backend ‘pyt’ failed”

[Martin Kletzander]

On 07/20/2012 10:20 AM, xuejie chen wrote:
> 2012/7/17 Martin Kletzander <mkletzan at redhat.com>:
>> On 07/17/2012 02:41 AM, Mark Wu wrote:
>>> On 07/16/2012 09:46 AM, xuejie chen wrote:
>>>>                      <source file="/rhev/data-center/2d7df94d-738d-4d7d-97a4-dd5027a4bf25/d3267b58-cbbd-4e6e-8685-8acd152d49a1/images/7e1011e0-d0ac-4c1f-bd09-a19e450c3259
>>> Please upgrade vdsm to 4.10.0 as Dan suggested above.  If the problem
>>> still exists, please:
>>>
>>> check the owner and permission of that image file:
>>>
>>> ls -l /rhev/data-center/2d7df94d-738d-4d7d-97a4-dd5027a4bf25/d3267b58-cbbd-4e6e-8685-8acd152d49a1/images/7e1011e0-d0ac-4c1f-bd09-a19e450c3259/9c728c1d-762e-4670-9076-9ca5a37b6354
>>>
>>> Run "setenforce 0" to disable selinux and see if it helps:
>>>
>>
>> As Mark pointed out, checking the permissions should be enough, so
>> "ls -lZ" will do. I don't know if "Local on host" means exactly what I
>> think, but in case it's not managed using vdsm, that directory may need
>> to me mounted from somewhere, libvirt itself doesn't do that (unless
>> it's in network filesystem pool).
> 
> I checked the owner of that image file is vdsm.
> But I found the user of qemu-kvm is root.
> So I modified the qemu.conf and set user to qemu.

This modification shouldn't be necessary as the binary packages are
compiled with this setting usually. However, in case you used some
yourself-built package, that might have caused the config change
(happens to me with compiled packages from repo.

Martin