Openstack Compute with Xen in Ubuntu 11.10 fails to load due to Domain-0 being considered an instance

Asked by Rogério Vinhal Nunes

I've installed nova-compute along with xen and libvirt in a fresh Ubuntu 11.10 install. But I'm experiencing some problems to get it running.

nova-compute service fails to start and nova-compute.log shows this error message:

2011-12-26 09:36:03,679 CRITICAL nova [-] [Errno 2] No such file or directory: '/var/lib/nova/instances/Domain-0/console.ring'
(nova): TRACE: Traceback (most recent call last):
(nova): TRACE: File "/usr/bin/nova-compute", line 49, in <module>
(nova): TRACE: service.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/", line 357, in wait
(nova): TRACE: _launcher.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/", line 107, in wait
(nova): TRACE: service.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/", line 166, in wait
(nova): TRACE: return self._exit_event.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/", line 116, in wait
(nova): TRACE: return hubs.get_hub().switch()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/hubs/", line 177, in switch
(nova): TRACE: return self.greenlet.switch()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/", line 192, in main
(nova): TRACE: result = function(*args, **kwargs)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/", line 77, in run_server
(nova): TRACE: server.start()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/", line 137, in start
(nova): TRACE: self.manager.init_host()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/compute/", line 157, in init_host
(nova): TRACE: self.driver.init_host(
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/", line 253, in init_host
(nova): TRACE: self._start_console_logger(name, fifo_path, ringbuffer_path)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/", line 297, in _start_console_logger
(nova): TRACE: self.console_loggers[name] = ConsoleLogger(fifo_path, ringbuffer_path)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/", line 186, in __init__
(nova): TRACE: FLAGS.libvirt_console_log_size)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/", line 932, in __init__
(nova): TRACE: self.f = self._open(backing_file)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/", line 970, in _open
(nova): TRACE: fd =, os.O_RDWR | os.O_CREAT, 0666)
(nova): TRACE: OSError: [Errno 2] No such file or directory: '/var/lib/nova/instances/Domain-0/console.ring'

Is there anything else I need to do to make Diablo work with Xen? It seems that openstack is considering Domain-0 an instance, what shouldn't be happening. I used to have a similar configuration in Ubuntu 10.04 and it worked fine.

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Heiko Krämer (foexle) said :

have the same issue.
Any have a solution ?

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Rogério Vinhal Nunes (rogervn) said :

I've posted this in the mailing list, still waiting for an answer.

I found out that this may be connected to libvirt because "virsh list" returns Domain-0, and my Ubuntu 10.04 working configuration didn't.

As this seems to be the correct behaviour for "virsh list", this seems like a openstack issue.

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Brian Lamar (blamar) said :

I'm unsure if anyone has successfully run OpenStack with a Libvirt/Xen combination. I could be wrong, but I've heard of a number of issues running this setup.

While Libvirt supports connecting to a Xen hypervisor... most OpenStack deployers use KVM/QEMU or LXC with Libvirt or use XenServer with the XenServer-specific 'driver'.

I'm sure this doesn't help, but at least it's something as OpenStack might currently be the wrong tool to use for this combination.

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Rogério Vinhal Nunes (rogervn) said :

I have successfully run openstack with Libvirt + Xen in Ubuntu 10.04, but it may be only because libvirt wasn't showing Domain-0 as intended. Everything else run fine, what could make solving this little problema a nice addition of features.

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Tom Fifield (fifieldt) said :


The bug here ( was solved in the Essex release, so I propose to close this Question.



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