Comment 2 for bug 1484439

Reviewed: https://review.openstack.org/212452
Committed: https://git.openstack.org/cgit/stackforge/os-ansible-deployment/commit/?id=b4d468ea22e23126c7924faf68df45598fd08e26
Submitter: Jenkins
Branch: master

commit b4d468ea22e23126c7924faf68df45598fd08e26
Author: Matt Thompson <email address hidden>
Date: Thu Aug 13 11:17:57 2015 +0100

    Add nova_libvirt_live_migration_flag variable

    Currently live_migration_flag is only written to nova.conf if Ceph is
    in use. However, there may be other use cases using live migrations
    where being able to override this is necessary. This commit introduces
    a new variable called nova_libvirt_live_migration_flag and writes
    live_migration_flag to nova.conf irrespective of whether Ceph is in
    use. We also relocate nova_libvirt_disk_cachemodes and
    nova_libvirt_hw_disk_discard in defaults/main.yml so that these
    defaults sit with the other nova_libvirt defaults.

    NOTE: We change the live_migration_flag defaults here to match nova's
          defaults. Several Ceph resources suggest to use
          VIR_MIGRATE_PERSIST_DEST however in my limited testing this did
          not appear to be necessary. We can update the default or amend
          it when using Ceph if we find that it is in fact necessary.

    Closes-Bug: #1484439
    Change-Id: I1baa9d590ae90ca45c763c8a5e6546c4825eabfe