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[Steven Webster <1667040@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
During instance evacuation to a new destination node, the InstanceNotFound exception is seen when check_instance_exists is called during the rebuild.

check_instance_exists is making sure the instance does _not_ exist, with
the intent that an exception will be raised if the instance does already
exist on a destination node.

The libvirt driver's instance_exists currently catches the InternalError
exception, but not the InstanceNotFound exception.

I believe this only affects the libvirt instance_exists implementation.

Steps to reproduce
==================
On a multi node libvirt/kvm system:

1. launch an instance on compute A
2. kill compute A nova-compute process
3. evacuate the instance on compute A

Environment
===========
1. Openstack release: Ocata + devstack

2. Which hypervisor did you use?
   Libvirt + KVM
   What's the version of that?

2. Which storage type did you use?
   LVM

3. Which networking type did you use?
   Neutron with OpenVSwitch

** Affects: nova
     Importance: Undecided
     Assignee: Stephen Finucane (stephenfinucane)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1667040

Title:
  InstanceNotFound exception during check_instance_exists on instance
  evacuation

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  Description
  ===========
  During instance evacuation to a new destination node, the InstanceNotFound exception is seen when check_instance_exists is called during the rebuild.

  check_instance_exists is making sure the instance does _not_ exist,
  with the intent that an exception will be raised if the instance does
  already exist on a destination node.

  The libvirt driver's instance_exists currently catches the
  InternalError exception, but not the InstanceNotFound exception.

  I believe this only affects the libvirt instance_exists
  implementation.

  Steps to reproduce
  ==================
  On a multi node libvirt/kvm system:

  1. launch an instance on compute A
  2. kill compute A nova-compute process
  3. evacuate the instance on compute A

  Environment
  ===========
  1. Openstack release: Ocata + devstack

  2. Which hypervisor did you use?
     Libvirt + KVM
     What's the version of that?

  2. Which storage type did you use?
     LVM

  3. Which networking type did you use?
     Neutron with OpenVSwitch

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