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[Eric Luo <nextfool@xxxxxxxxx>]

Hello ,all.

I have a two nodes installation . OS1 is the cloud controller ,and OS2 is a
nova-compute node.
I have a vm (name as vm1)  running on OS1.
When I use the command *  nova migrate  vm1 *
*
*
The dashboard is showing the vm1 as : status :error ,task :Resize Prep
I tail ed  the nova-compute.log in OS1, and found the following error
information while running the  * nova migrate  vm1 *command :


Can someone please explain to me what does these error mean ,and what's
wrong with my config ...


2012-05-21 17:20:45 ERROR nova.compute.manager
[req-d0f494cb-e9d6-41d2-b6df-6faa432a644d 6ffaaedb60c24f5eb888319e1e387d75
0d7a5a12b6f54aa9bff986bf138bc0b7] Unex pected error while running command.
Command: ssh 192.168.0.205 mkdir -p
/var/lib/nova/instances/instance-0000000a
Exit code: 255
Stdout: ''
Stderr: 'Host key verification failed.\r\n'. Setting instance vm_state to
ERROR
2012-05-21 17:20:45 ERROR nova.rpc.amqp
[req-d0f494cb-e9d6-41d2-b6df-6faa432a644d 6ffaaedb60c24f5eb888319e1e387d75
0d7a5a12b6f54aa9bff986bf138bc0b7] Exception during message handling
2012-05-21 17:20:45 TRACE nova.rpc.amqp Traceback (most recent call last):
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/rpc/amqp.py", line 252, in
_process_data
2012-05-21 17:20:45 TRACE nova.rpc.amqp     rval = node_func(context=ctxt,
**node_args)
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped
2012-05-21 17:20:45 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 153, in
decorated_function
2012-05-21 17:20:45 TRACE nova.rpc.amqp     function(self, context,
instance_uuid, *args, **kwargs)
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 177, in
decorated_function
2012-05-21 17:20:45 TRACE nova.rpc.amqp     sys.exc_info())
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-05-21 17:20:45 TRACE nova.rpc.amqp     self.gen.next()
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 171, in
decorated_function
2012-05-21 17:20:45 TRACE nova.rpc.amqp     return function(self, context,
instance_uuid, *args, **kwargs)
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1330, in
resize_instance
2012-05-21 17:20:45 TRACE nova.rpc.amqp
self._set_instance_error_state(context, instance_uuid)
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2012-05-21 17:20:45 TRACE nova.rpc.amqp     self.gen.next()
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1325, in
resize_instance
2012-05-21 17:20:45 TRACE nova.rpc.amqp     instance_type_ref,
self._legacy_nw_info(network_info))
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/exception.py", line 114, in wrapped
2012-05-21 17:20:45 TRACE nova.rpc.amqp     return f(*args, **kw)
2012-05-21 17:20:45 TRACE nova.rpc.amqp   File
"/usr/lib/python2.7/dist-packages/nova/virt/libvirt/connection.py", line
2363, in migrate_disk_and_power_off
2012-05-21 17:20:45 TRACE nova.rpc.amqp     raise e
2012-05-21 17:20:45 TRACE nova.rpc.amqp ProcessExecutionError: Unexpected
error while running command.
2012-05-21 17:20:45 TRACE nova.rpc.amqp Command: ssh 192.168.0.205 mkdir -p
/var/lib/nova/instances/instance-0000000a
2012-05-21 17:20:45 TRACE nova.rpc.amqp Exit code: 255
2012-05-21 17:20:45 TRACE nova.rpc.amqp Stdout: ''
2012-05-21 17:20:45 TRACE nova.rpc.amqp Stderr: 'Host key verification
failed.\r\n'
2012-05-21 17:20:45 TRACE nova.rpc.amqp
^C