CentOS virt - Jan 2014 - Can't create new Xen domains using libvirt on CentOS 6.5

Hello,

we have a strange problem on a fresh install of CentOS 6.5. On the
server we want to use Xen to host paravirtualised guests (the system has
no hardware virtualization support). To manage the domain we would like
to use libvirt. Xen and libvirt are set up as described here:

http://wiki.centos.org/HowTos/Xen/Xen4QuickStart
http://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt

When we try to create a new domain this does not work. In
/var/log/xen/xend.log we have to the following error:

[2014-01-28 10:23:02 1651] DEBUG (XendDomainInfo:103)
XendDomainInfo.create(['vm', ['name', 'ccm'],
['memory', '1024'],
['maxmem', '1024'], ['vcpus', '1'],
['uuid',
'be62b0d3-4911-137f-210f-9b0948828106'], ['bootloader',
'/usr/bin/pygrub'], ['on_poweroff', 'destroy'],
['on_reboot',
'restart'], ['on_crash', 'restart'], ['image',
['linux', ['localtime',
'0']]], ['localtime', '0'], ['device',
['vbd', ['dev', 'xvda'],
['uname', 'phy:/dev/medusa-vm/ccm'], ['mode',
'w']]], ['device', ['vif',
['mac', '00:16:3e:1c:ee:5b'], ['bridge', 'br0'],
['script',
'vif-bridge'], ['model', 'virtio']]]])
[2014-01-28 10:23:02 1651] DEBUG (XendDomainInfo:2499)
XendDomainInfo.constructDomain
[2014-01-28 10:23:02 1651] DEBUG (balloon:187) Balloon: 26832188 KiB
free; need 16384; done.
[2014-01-28 10:23:02 1651] ERROR (XendDomainInfo:2561) (1, 'Operation
not permitted')
Traceback (most recent call last):
  File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 2556, in _constructDomain
    target = self.info.target())
Error: (1, 'Operation not permitted')
[2014-01-28 10:23:02 1651] ERROR (XendDomainInfo:488) VM start failed
Traceback (most recent call last):
  File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 473, in start
    XendTask.log_progress(0, 30, self._constructDomain)
  File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", line
209, in log_progress
    retval = func(*args, **kwds)
  File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 2567, in _constructDomain
    raise VmError(failmsg)
VmError: Creating domain failed: name=ccm
[2014-01-28 10:23:02 1651] ERROR (XendDomainInfo:108) Domain
construction failed
Traceback (most recent call last):
  File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 106, in create
    vm.start()
  File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 473, in start
    XendTask.log_progress(0, 30, self._constructDomain)
  File "/usr/lib64/python2.6/site-packages/xen/xend/XendTask.py", line
209, in log_progress
    retval = func(*args, **kwds)
  File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
line 2567, in _constructDomain
    raise VmError(failmsg)
VmError: Creating domain failed: name=ccm
[2014-01-28 10:23:02 1651] ERROR (SrvBase:88) Request create failed.
Traceback (most recent call last):
  File "/usr/lib64/python2.6/site-packages/xen/web/SrvBase.py", line
85,
in perform
    return op_method(op, req)
  File
"/usr/lib64/python2.6/site-packages/xen/xend/server/SrvDomainDir.py",
line 82, in op_create
    raise XendError("Error creating domain: " + str(ex))
XendError: Error creating domain: Creating domain failed: name=ccm

Any help is appreciated.

Best regards,

Jens Pelzetter

On Tue, 28 Jan 2014, Jens Pelzetter wrote:
> Hello,
> 
> we have a strange problem on a fresh install of CentOS 6.5. On the
> server we want to use Xen to host paravirtualised guests (the system has
> no hardware virtualization support). To manage the domain we would like
> to use libvirt. Xen and libvirt are set up as described here:
> 
> http://wiki.centos.org/HowTos/Xen/Xen4QuickStart
> http://wiki.centos.org/HowTos/Xen/Xen4QuickStart/Xen4Libvirt
> 
> When we try to create a new domain this does not work. In
> /var/log/xen/xend.log we have to the following error:
Could you please post the output of xm dmesg?

> [2014-01-28 10:23:02 1651] DEBUG (XendDomainInfo:103)
> XendDomainInfo.create(['vm', ['name', 'ccm'],
['memory', '1024'],
> ['maxmem', '1024'], ['vcpus', '1'],
['uuid',
> 'be62b0d3-4911-137f-210f-9b0948828106'], ['bootloader',
> '/usr/bin/pygrub'], ['on_poweroff', 'destroy'],
['on_reboot',
> 'restart'], ['on_crash', 'restart'],
['image', ['linux', ['localtime',
> '0']]], ['localtime', '0'], ['device',
['vbd', ['dev', 'xvda'],
> ['uname', 'phy:/dev/medusa-vm/ccm'], ['mode',
'w']]], ['device', ['vif',
> ['mac', '00:16:3e:1c:ee:5b'], ['bridge',
'br0'], ['script',
> 'vif-bridge'], ['model', 'virtio']]]])
> [2014-01-28 10:23:02 1651] DEBUG (XendDomainInfo:2499)
> XendDomainInfo.constructDomain
> [2014-01-28 10:23:02 1651] DEBUG (balloon:187) Balloon: 26832188 KiB
> free; need 16384; done.
> [2014-01-28 10:23:02 1651] ERROR (XendDomainInfo:2561) (1, 'Operation
> not permitted')
> Traceback (most recent call last):
>   File
"/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py",
> line 2556, in _constructDomain
>     target = self.info.target())
> Error: (1, 'Operation not permitted')
Are xend and libvirt running as root? Do you have SELinux enabled?