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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/service.py",
line 357, in wait
(nova): TRACE: _launcher.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/service.py",
line 107, in wait
(nova): TRACE: service.wait()
(nova): TRACE: File
"/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 166, in
wait
(nova): TRACE: return self._exit_event.wait()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/eventlet/event.py",
line 116, in wait
(nova): TRACE: return hubs.get_hub().switch()
(nova): TRACE: File
"/usr/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line 177, in switch
(nova): TRACE: return self.greenlet.switch()
(nova): TRACE: File
"/usr/lib/python2.7/dist-packages/eventlet/greenthread.py", line 192, in
main
(nova): TRACE: result = function(*args, **kwargs)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/service.py",
line 77, in run_server
(nova): TRACE: server.start()
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/service.py",
line 137, in start
(nova): TRACE: self.manager.init_host()
(nova): TRACE: File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 157, in
init_host
(nova): TRACE: self.driver.init_host(host=self.host)
(nova): TRACE: File
"/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", 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/connection.py", 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/connection.py", line
186, in __init__
(nova): TRACE: FLAGS.libvirt_console_log_size)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/utils.py", line
932, in __init__
(nova): TRACE: self.f = self._open(backing_file)
(nova): TRACE: File "/usr/lib/python2.7/dist-packages/nova/utils.py", line
970, in _open
(nova): TRACE: fd = os.open(filename, 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. I have a Ubuntu 10.04
configuration that works fine, I've found out that in this configuration
"virsh list" doesn't show Domain-0, so that may be the problem. But for
libvirt showing the Domain-0 vm seems like the correct behaviour,
nova-compute is the one that should ignore it.

I've filed a bug ( https://bugs.launchpad.net/bugs/912701 ) and also a
question ( https://answers.launchpad.net/nova/+question/182917 ), but I've
got no answer yet. This is pretty critical, is there something I can do to
workaround it? I would want to avoid using xenapi directly.
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