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[Charlotte Han <han.rong3@xxxxxxxxxx>]

** Changed in: nova
       Status: In Progress => Won't Fix

** Changed in: nova
     Assignee: Charlotte Han (hanrong) => (unassigned)

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https://bugs.launchpad.net/bugs/1527135

Title:
  cells：boot instance is failed  in cells

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  1. version
  kilo 2015.1.0

  There has one api cell and two child cell and four compute nodes, api
  cell has not compute node.

  I boot an instance , but the instance  has been in a spawning state five minutes. if vif_plugging_is_fatal in nova.conf is False, the instance will be active, the nova-compute.log has an log:
  2015-12-15 16:28:35.463 27714 WARNING nova.virt.libvirt.driver [req-c376aae5-e685-4968-b3fb-b819d9079ea4 f04e318acd7e4e5093c91e6dc74a28c3 53adc6d6825b43378d6ab89fc38051da - - -] Timeout waiting for vif plugging callback for instance 8d5e5742-0e16-410c-8333-cb1c46dc5002
  2015-12-15 16:28:35.468 27714 INFO nova.compute.manager [req-8da0ed3a-1349-4380-aadb-0c44477fbccb - - - - -] [instance: 8d5e5742-0e16-410c-8333-cb1c46dc5002] VM Resumed (Lifecycle Event)
  2015-12-15 16:28:35.476 27714 INFO nova.virt.libvirt.driver [-] [instance: 8d5e5742-0e16-410c-8333-cb1c46dc5002] Instance spawned successfully.

  if vif_plugging_is_fatal in nova.conf is True, the instance will be error and It will throw an exception in nova-compute.log:
  VirtualInterfaceCreateException: Virtual Interface creation failed

  the reason is that there has not external_instance_event method in
  cells, it need add  external_instance_event in cells/rpcapi.py ,
  manager.py , messaging.py .

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