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[Bug 1349978] [NEW] hard reboot doesn't re-create instance folder

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Public bug reported:

hard-rebooting a libvirt instance assumes the instance's folder exists
(ie. /var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/).
When nova tries to re-create the XML file it causes this stack trace:

2014-07-29 16:02:41.250 2922 ERROR oslo.messaging.rpc.dispatcher [-] Exception during message handling: [Errno 2] No such file or directory: '/var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/libvirt.xml'
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     payload)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return f(self, context, *args, **kw)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 274, in decorated_function
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     pass
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 260, in decorated_function
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 327, in decorated_function
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     function(self, context, *args, **kwargs)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 303, in decorated_function
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     e, sys.exc_info())
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 290, in decorated_function
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2649, in reboot_instance
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     self._set_instance_obj_error_state(context, instance)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2630, in reboot_instance
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     bad_volumes_callback=bad_volumes_callback)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1999, in reboot
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     block_device_info)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2092, in _hard_reboot
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     write_to_disk=True)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3455, in to_xml
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     libvirt_utils.write_to_file(xml_path, xml)
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/utils.py", line 526, in write_to_file
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     with open(path, 'w') as f:
2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher IOError: [Errno 2] No such file or directory: '/var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/libvirt.xml'

If I manually create the directory hard-reboot works as expected.

Example why this might happen:
If your nova-compute node was stateless (booted with ram_fs mounted on /) it would forget all its instances after being power cycled. The instances could be recovered with hard-reboot (assuming their disks weren't local) if the instance's folder was re-created.

nova-compute version: icehouse 2014.1.1

I could write a patch + tests if we decide to do this.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: compute

** Description changed:

  hard-rebooting a libvirt instance assumes the instance's folder exists
  (ie. /var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/).
  When nova tries to re-create the XML file it causes this stack trace:
  
  2014-07-29 16:02:41.250 2922 ERROR oslo.messaging.rpc.dispatcher [-] Exception during message handling: [Errno 2] No such file or directory: '/var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/libvirt.xml'
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     payload)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 274, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     pass
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 260, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 327, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     function(self, context, *args, **kwargs)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 303, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     e, sys.exc_info())
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 290, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2649, in reboot_instance
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     self._set_instance_obj_error_state(context, instance)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2630, in reboot_instance
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     bad_volumes_callback=bad_volumes_callback)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1999, in reboot
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     block_device_info)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2092, in _hard_reboot
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     write_to_disk=True)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3455, in to_xml
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     libvirt_utils.write_to_file(xml_path, xml)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/utils.py", line 526, in write_to_file
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     with open(path, 'w') as f:
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher IOError: [Errno 2] No such file or directory: '/var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/libvirt.xml'
  
  If I manually create the directory hard-reboot works as expected.
  
  Example why this might happen:
  If your nova-compute node was stateless (booted with ram_fs mounted on /) it would forget all its instances after being power cycled. The instances could be recovered with hard-reboot (assuming their disks weren't local) if the instance's folder was re-created.
  
  nova-compute version: icehouse 2014.1.1
  
- 
- I could write a patch + tests if we decide to do this. The change would be small.
+ I could write a patch + tests if we decide to do this.

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https://bugs.launchpad.net/bugs/1349978

Title:
  hard reboot doesn't re-create instance folder

Status in OpenStack Compute (Nova):
  New

Bug description:
  hard-rebooting a libvirt instance assumes the instance's folder exists
  (ie. /var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/).
  When nova tries to re-create the XML file it causes this stack trace:

  2014-07-29 16:02:41.250 2922 ERROR oslo.messaging.rpc.dispatcher [-] Exception during message handling: [Errno 2] No such file or directory: '/var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/libvirt.xml'
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher Traceback (most recent call last):
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 133, in _dispatch_and_reply
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     incoming.message))
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 176, in _dispatch
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return self._do_dispatch(endpoint, method, ctxt, args)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/oslo/messaging/rpc/dispatcher.py", line 122, in _do_dispatch
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     result = getattr(endpoint, method)(ctxt, **new_args)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 88, in wrapped
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     payload)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/exception.py", line 71, in wrapped
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return f(self, context, *args, **kw)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 274, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     pass
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 260, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 327, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     function(self, context, *args, **kwargs)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 303, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     e, sys.exc_info())
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 290, in decorated_function
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     return function(self, context, *args, **kwargs)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2649, in reboot_instance
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     self._set_instance_obj_error_state(context, instance)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/openstack/common/excutils.py", line 68, in __exit__
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 2630, in reboot_instance
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     bad_volumes_callback=bad_volumes_callback)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 1999, in reboot
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     block_device_info)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2092, in _hard_reboot
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     write_to_disk=True)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 3455, in to_xml
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     libvirt_utils.write_to_file(xml_path, xml)
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/utils.py", line 526, in write_to_file
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher     with open(path, 'w') as f:
  2014-07-29 16:02:41.250 2922 TRACE oslo.messaging.rpc.dispatcher IOError: [Errno 2] No such file or directory: '/var/lib/nova/instances/e4e4a4a3-1036-4734-9c0b-3bb34c88b8b6/libvirt.xml'

  If I manually create the directory hard-reboot works as expected.

  Example why this might happen:
  If your nova-compute node was stateless (booted with ram_fs mounted on /) it would forget all its instances after being power cycled. The instances could be recovered with hard-reboot (assuming their disks weren't local) if the instance's folder was re-created.

  nova-compute version: icehouse 2014.1.1

  I could write a patch + tests if we decide to do this.

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