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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => juno-rc1

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https://bugs.launchpad.net/bugs/1351002

Title:
  live migration (non-block-migration) with shared instance storage and
  config drive fails

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Note: the reproduction case below has been fixed by not blocking migration on config drives.  However, the underlying issue of NFS not being marked
  as shared storage still stands, since the 'is_shared_block_storage' data
  is used elsewhere as well.

  ---------------------------------------------------------------------------

  To reproduce:

  1. Set up shared instance storage via NFS and use one of the file-based image backends
  2. Boot an instance with a config drive
  3. Attempt to live migrate said instance w/o doing a block migration

  The issue is caused by the following lines in nova/virt/libvirt/driver.py:
          if not (is_shared_instance_path and is_shared_block_storage):
              # NOTE(mikal): live migration of instances using config drive is
              # not supported because of a bug in libvirt (read only devices
              # are not copied by libvirt). See bug/1246201
              if configdrive.required_by(instance):
                  raise exception.NoLiveMigrationForConfigDriveInLibVirt()

  The issue, I believe, was caused by commit bc45c56f1, which separated
  checks for shared instance directories and shared block storage
  backends like Ceph.  The issue is that if a deployer is not using
  Ceph, the call to
  self.image_backend.backend().is_shared_block_storage() returns False.
  However, is_shared_block_storage should not even be considered if the
  image backend is a file-based one.

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