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[Mathieu Rohon <mathieu.rohon@xxxxxxxxx>]

Public bug reported:

I'm using the libvirt driver

I've configured libvirtd and nova so that block migration can occur.

I boot a simple cirros, with no config drive; when I ask for a live-
migration I get this error on my source node, concerning the
incompatibily between live-migration and the config-drive attached to my
VM  :


  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
    executor_callback))

  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
    executor_callback)

  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
    result = func(ctxt, **new_args)

  File "/opt/stack/nova/nova/compute/manager.py", line 440, in decorated_function
    return function(self, context, *args, **kwargs)

  File "/opt/stack/nova/nova/exception.py", line 88, in wrapped
    payload)

  File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
    six.reraise(self.type_, self.value, self.tb)

  File "/opt/stack/nova/nova/exception.py", line 71, in wrapped
    return f(self, context, *args, **kw)

  File "/opt/stack/nova/nova/compute/manager.py", line 352, in decorated_function
    kwargs['instance'], e, sys.exc_info())

  File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
    six.reraise(self.type_, self.value, self.tb)

  File "/opt/stack/nova/nova/compute/manager.py", line 340, in decorated_function
    return function(self, context, *args, **kwargs)

  File "/opt/stack/nova/nova/compute/manager.py", line 5120, in pre_live_migration
    migrate_data)

  File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 5734, in pre_live_migration
    raise exception.NoLiveMigrationForConfigDriveInLibVirt()

NoLiveMigrationForConfigDriveInLibVirt: Live migration of instances with
config drives is not supported in libvirt unless libvirt instance path
and drive data is shared across compute nodes.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: libvirt

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https://bugs.launchpad.net/bugs/1439423

Title:
  live-migration --block-migrate fails without config drive

Status in OpenStack Compute (Nova):
  New

Bug description:
  I'm using the libvirt driver

  I've configured libvirtd and nova so that block migration can occur.

  I boot a simple cirros, with no config drive; when I ask for a live-
  migration I get this error on my source node, concerning the
  incompatibily between live-migration and the config-drive attached to
  my VM  :


    File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
      executor_callback))

    File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
      executor_callback)

    File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
      result = func(ctxt, **new_args)

    File "/opt/stack/nova/nova/compute/manager.py", line 440, in decorated_function
      return function(self, context, *args, **kwargs)

    File "/opt/stack/nova/nova/exception.py", line 88, in wrapped
      payload)

    File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
      six.reraise(self.type_, self.value, self.tb)

    File "/opt/stack/nova/nova/exception.py", line 71, in wrapped
      return f(self, context, *args, **kw)

    File "/opt/stack/nova/nova/compute/manager.py", line 352, in decorated_function
      kwargs['instance'], e, sys.exc_info())

    File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 85, in __exit__
      six.reraise(self.type_, self.value, self.tb)

    File "/opt/stack/nova/nova/compute/manager.py", line 340, in decorated_function
      return function(self, context, *args, **kwargs)

    File "/opt/stack/nova/nova/compute/manager.py", line 5120, in pre_live_migration
      migrate_data)

    File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 5734, in pre_live_migration
      raise exception.NoLiveMigrationForConfigDriveInLibVirt()

  NoLiveMigrationForConfigDriveInLibVirt: Live migration of instances
  with config drives is not supported in libvirt unless libvirt instance
  path and drive data is shared across compute nodes.

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