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[Joe Breu <joseph.breu@xxxxxxxxxxxxx>]

Hi Eric,

It would appear that the nova user on one of the compute nodes had at one time cached the SSH host key of the other node and now the key has changed.  You can bypass this by adding the following to ~nova/.ssh/config on both compute nodes:

Host *
   StrictHostKeyChecking no
   UserKnownHostsFile=/dev/null


---
Joseph Breu
Deployment Engineer
Rackspace Cloud Builders
210-312-3508

On May 21, 2012, at 11:34 AM, Eric Luo wrote:

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



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