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Reviewed:  https://review.openstack.org/398956
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=90f5a727e98a59c648c0dc4222050857d59edab2
Submitter: Jenkins
Branch:    master

commit 90f5a727e98a59c648c0dc4222050857d59edab2
Author: Pawel Koniszewski <pawel.koniszewski@xxxxxxxxx>
Date:   Tue Nov 29 17:13:37 2016 +0100

    Convert live migration uri back to string
    
    If live_migration_inbound_addr is set in nova.conf, value of the option
    will be saved under target_connect_addr in migrate_data. Unfortunately,
    the type of value saved in target_connect_addr is unicode, therefore
    when creating URI for live migration over dedicated interface we are
    ending up with unicode type which is not acceptable by libvirt. To fix
    the issue let's convert URI explictly back to string.
    
    Change-Id: I651cc7a45fe06a2b6d81e007c4faf62947ee3203
    Closes-Bug: #1638625


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1638625

Title:
  Nova fails live migrations on dedicated interface due to wrong type of
  migrate_uri

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Nova fails all live migrations on dedicated interface due to
  conversion of string to unicode (in Python 2.7).

  My environment:
  * nova trunk, commit 40f9b0ad16d3a5fae184bbe6d4a49cf792967089
  * QEMU 2.6
  * Libvirt 1.3.4

  1. Set live_migration_inbound_addr to IP address of existing interface
  2. Make sure that live_migration_tunnelled is set to False
  3. Restart nova-compute
  4. Try to live migrate any instance
  5. Outcome:

  2016-11-02 12:26:04.272 DEBUG nova.virt.libvirt.driver [req-f3cc94e2-4b45-4236-8d1b-888343ae6885 admin demo] [instance: 09b7c15c-7a5c-4e86-8c27-96d2edc5094c] Migration operation thread notification from (pid=8533) thread_finished /opt/stack/nova/nova/virt/libvirt/driver.py:6325
  Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/hub.py", line 457, in fire_timers
      timer()
    File "/usr/local/lib/python2.7/dist-packages/eventlet/hubs/timer.py", line 58, in __call__
      cb(*args, **kw)
    File "/usr/local/lib/python2.7/dist-packages/eventlet/event.py", line 168, in _do_send
      waiter.switch(result)
    File "/usr/local/lib/python2.7/dist-packages/eventlet/greenthread.py", line 214, in main
      result = function(*args, **kwargs)
    File "/opt/stack/nova/nova/utils.py", line 1066, in context_wrapper
      return func(*args, **kwargs)
    File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 5926, in _live_migration_operation
      instance=instance)
    File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/usr/local/lib/python2.7/dist-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 5922, in _live_migration_operation
      bandwidth=CONF.libvirt.live_migration_bandwidth)
    File "/opt/stack/nova/nova/virt/libvirt/guest.py", line 571, in migrate
      destination, params=params, flags=flags)
    File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 186, in doit
      result = proxy_call(self._autowrap, f, *args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 144, in proxy_call
      rv = execute(f, *args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 125, in execute
      six.reraise(c, e, tb)
    File "/usr/local/lib/python2.7/dist-packages/eventlet/tpool.py", line 83, in tworker
      rv = meth(*args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/libvirt.py", line 1915, in migrateToURI3
      ret = libvirtmod.virDomainMigrateToURI3(self._o, dconnuri, params, flags)
  TypeError: Unknown type of "migrate_uri" field

  This happens to me everytime when trying to live migrate any VM over
  dedicated interface using nova trunk.

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