Comment 3 for bug 983845

I encounter the similar error when restart nova-compute, the process can not be strated:

2013-01-17 15:49:40 INFO nova.compute.manager [req-33db31ad-0456-4c21-b0fd-742cf9771e13 None None] [instance: 10085d25-056c-4856-b5ac-0806ce70ead3] Rebooting instance after nova-compute restart.
2013-01-17 15:49:40 CRITICAL nova [-] [Errno 2] No such file or directory: '/var/lib/nova/instances/instance-00000002/libvirt.xml'
2013-01-17 15:49:40 TRACE nova Traceback (most recent call last):
2013-01-17 15:49:40 TRACE nova File "/usr/bin/nova-compute", line 48, in <module>
2013-01-17 15:49:40 TRACE nova service.wait()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/service.py", line 659, in wait
2013-01-17 15:49:40 TRACE nova _launcher.wait()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/service.py", line 192, in wait
2013-01-17 15:49:40 TRACE nova super(ServiceLauncher, self).wait()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/service.py", line 162, in wait
2013-01-17 15:49:40 TRACE nova service.wait()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/eventlet/greenthread.py", line 166, in wait
2013-01-17 15:49:40 TRACE nova return self._exit_event.wait()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/eventlet/event.py", line 116, in wait
2013-01-17 15:49:40 TRACE nova return hubs.get_hub().switch()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/eventlet/hubs/hub.py", line 177, in switch
2013-01-17 15:49:40 TRACE nova return self.greenlet.switch()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/eventlet/greenthread.py", line 192, in main
2013-01-17 15:49:40 TRACE nova result = function(*args, **kwargs)
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/service.py", line 132, in run_server
2013-01-17 15:49:40 TRACE nova server.start()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/service.py", line 398, in start
2013-01-17 15:49:40 TRACE nova self.manager.init_host()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 313, in init_host
2013-01-17 15:49:40 TRACE nova block_device_info)
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/exception.py", line 117, in wrapped
2013-01-17 15:49:40 TRACE nova temp_level, payload)
2013-01-17 15:49:40 TRACE nova File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
2013-01-17 15:49:40 TRACE nova self.gen.next()
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/exception.py", line 92, in wrapped
2013-01-17 15:49:40 TRACE nova return f(*args, **kw)
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 981, in resume_state_on_host_boot
2013-01-17 15:49:40 TRACE nova xml = self._get_domain_xml(instance)
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 685, in _get_domain_xml
2013-01-17 15:49:40 TRACE nova xml = libvirt_utils.load_file(xml_path)
2013-01-17 15:49:40 TRACE nova File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/utils.py", line 349, in load_file
2013-01-17 15:49:40 TRACE nova with open(path, 'r') as fp:
2013-01-17 15:49:40 TRACE nova IOError: [Errno 2] No such file or directory: '/var/lib/nova/instances/instance-00000002/libvirt.xml'
2013-01-17 15:49:40 TRACE nova