** Also affects: nova/pike
   Importance: Undecided
       Status: New

** Also affects: nova/ocata
   Importance: Undecided
       Status: New

** Changed in: nova/ocata
       Status: New => Confirmed

** Changed in: nova/pike
   Importance: Undecided => Medium

** Changed in: nova
     Assignee: (unassigned) => Matt Riedemann (mriedem)

** Changed in: nova/pike
       Status: New => Confirmed

** Changed in: nova/ocata
   Importance: Undecided => Medium

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1597596

Title:
  network not always cleaned up when spawning VMs

Status in OpenStack Compute (nova):
  Confirmed
Status in OpenStack Compute (nova) ocata series:
  Confirmed
Status in OpenStack Compute (nova) pike series:
  Confirmed

Bug description:
  Here are the scenario:
  1). Nova scheduler/conductor selects a nova-compute A to spin a VM
  2). Nova compute A tries to spin the VM, but the process failed, and 
generates a RE-SCHEDULE exception.
  3). in re-schedule exception, only when retry is none, network resource is 
properly cleaned up. when retry is not none, the network is not cleaned up, the 
port information still stays with the VM.
  4). Nova condutor was notified about the failure. It selects nova-compute-B 
to spin VM.
  5). nova compute B spins up VM successfully. However, from the 
instance_info_cache, the network_info showed two ports allocated for VM, one 
from the origin network A that associated with nova-compute A nad one from 
network B that associated with nova compute B.

  To simulate the case, raise a fake exception in
  _do_build_and_run_instance in nova-compute A:

  diff --git a/nova/compute/manager.py b/nova/compute/manager.py
  index ac6d92c..8ce8409 100644
  --- a/nova/compute/manager.py
  +++ b/nova/compute/manager.py
  @@ -1746,6 +1746,7 @@ class ComputeManager(manager.Manager):
                           filter_properties)
               LOG.info(_LI('Took %0.2f seconds to build instance.'),
                        timer.elapsed(), instance=instance)
  +            raise exception.RescheduledException( 
instance_uuid=instance.uuid, reason="simulated-fault")
               return build_results.ACTIVE
           except exception.RescheduledException as e:
               retry = filter_properties.get('retry')

  environments: 
  *) nova master branch
  *) ubuntu 12.04
  *) kvm
  *) bridged network.

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