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[Eli Qiao <liyong.qiao@xxxxxxxxx>]

** Changed in: nova
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/1281295

Title:
  Live-migration nova fails with qemu and libvirt

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Hi,
  I posted two messages to ask.ubuntu about my problem without solution:
  https://ask.openstack.org/en/question/12033/live-migration-with-qemu-is-possible/
  https://ask.openstack.org/en/question/12134/live-migration-with-qemu-is-really-possible/
  and I reported the problem in #openstack. Until now, I can't find a solution.

  I'm using Openstack Havana in CentOS. I've installed 1 controller and
  2 compute nodes, with NFS.  Controller folder is shared by the compute
  nodes (folder /var/lib/nova/instances). All nodes are accessible among
  them without password. I can perform a migration in the dashboard. In
  the shell, I exaustivelly tried  live migration without sucess. I'm
  setting /etc/nova/nova.conf and uncomment all live-migration options.
  I'm trying the following in the shell:

  # nova live-migration MY_UUID_VM_INSTANCE my_host_destine

  But silenty this command not works.

  Finally, my log of /var/log/nova-all.log:

  ---
  <0>Feb 17 20:19:43 node-4 ¿<179>nova-nova.openstack.common.rpc.amqp ERROR: Exception during message handling
  Traceback (most recent call last):
    File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/amqp.py", line 461, in _process_data
      **args)
    File "/usr/lib/python2.6/site-packages/nova/openstack/common/rpc/dispatcher.py", line 172, in dispatch
      result = getattr(proxyobj, method)(ctxt, **kwargs)
    File "/usr/lib/python2.6/site-packages/nova/exception.py", line 90, in wrapped
      payload)
    File "/usr/lib/python2.6/site-packages/nova/exception.py", line 73, in wrapped
      return f(self, context, *args, **kw)
    File "/usr/lib/python2.6/site-packages/nova/compute/manager.py", line 4016, in pre_live_migration
      migrate_data)
    File "/usr/lib/python2.6/site-packages/nova/virt/libvirt/driver.py", line 4162, in pre_live_migration
      self._create_images_and_backing(context, instance, instance_dir,
  UnboundLocalError: local variable 'instance_dir' referenced before assignment
  <0>Feb 17 20:20:16 node-4 ¿<180>nova-nova.compute.resource_tracker AUDIT: Auditing locally available compute resources
  <0>Feb 17 20:20:16 node-4 ¿<180>nova-nova.compute.resource_tracker AUDIT: Free ram (MB): 1494
  <0>Feb 17 20:20:16 node-4 ¿<180>nova-nova.compute.resource_tracker AUDIT: Free disk (GB): 14
  <0>Feb 17 20:20:16 node-4 ¿<180>nova-nova.compute.resource_tracker AUDIT: Free VCPUS: 2
  <0>Feb 17 20:20:16 node-4 ¿<182>nova-nova.compute.resource_tracker INFO: Compute_service record updated for node-4.domain.tld:node-4.domain.tld
  <0>Feb 17 20:21:15 node-4 ¿<180>nova-nova.compute.resource_tracker AUDIT: Auditing locally available compute resources
  <0>Feb 17 20:21:15 node-4 ¿<180>nova-nova.compute.resource_tracker AUDIT: Free ram (MB): 1494
  <0>Feb 17 20:21:15 node-4 ¿<180>nova-nova.compute.resource_tracker AUDIT: Free disk (GB): 14
  <0>Feb 17 20:21:15 node-4 ¿<180>nova-nova.compute.resource_tracker AUDIT: Free VCPUS: 2
  <0>Feb 17 20:21:15 node-4 ¿<182>nova-nova.compute.resource_tracker INFO: Compute_service record updated for node-4.domain.tld:node-4.domain.tld

  ---

  This is a bug? Someone could help me? I should use KVM instead qemu?
  Any help is usefull. Thanks in advance.

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