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A few notes on what doesn't work quite right:

* attaching to a console (via nova console-log).  This does not work (for now) due to https://bugzilla.redhat.com/show_bug.cgi?id=1170743

* terminating an instance (via nova delete).  It throws an exception within nova:

2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/nova/nova/compute/manager.py", line 2379, in _shutdown_instance
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     block_device_info)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 1096, in destroy
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     destroy_disks, migrate_data)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 1222, in cleanup
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     self._undefine_domain(instance)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 1127, in _undefine_domain
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     {'errcode': errcode, 'e': e}, instance=instance)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/oslo/utils/excutils.py", line 82, in __exit__
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     six.reraise(self.type_, self.value, self.tb)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 1111, in _undefine_domain
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     virt_dom.undefine()
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 183, in doit
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     result = proxy_call(self._autowrap, f, *args, **kwargs)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 141, in proxy_call
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     rv = execute(f, *args, **kwargs)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 122, in execute
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     six.reraise(c, e, tb)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 80, in tworker
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     rv = meth(*args, **kwargs)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher   File "/usr/lib/python2.7/dist-packages/libvirt.py", line 2396, in undefine
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher     if ret == -1: raise libvirtError ('virDomainUndefine() failed', dom=self)
2014-12-05 10:15:12.958 TRACE oslo.messaging.rpc.dispatcher libvirtError: internal error: client socket is closed

The domain _is_ terminated, though.  Calling 'nova delete' again removes it from the list.

* Using qcow images (or overlays) -- must configure nova/libvirt to use 'raw'