Cannot override Ceph as storage for nova, glance, and cinder

[Ramana Raja]

One should have the choice to enable or not enable Ceph as the storage for the OpenStack services - Cinder, Nova, and Glance. Currently, if any of the services, Cinder, Nova, or Glance is enabled, then the service is configured with Ceph[1]. While this should be the default behaviour/setting of the plugin, it should not be the only allowed setting, and the setting should easily be overridden if needed. Consider the use case, where one would like to use Ceph storage only for Cinder and not for Glance.

[1]https://github.com/openstack/devstack-plugin-ceph/commit/27d28f3101814c9333df78a1f08b8e7239ae69cd#diff-cd9ddf33b5bab44d58ff1f7e5ccc0c53R24

[Ramana Raja (rraja)]

The patch that tries to fix the bug,
https://review.openstack.org/#/c/254792/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/254792
Committed: https://git.openstack.org/cgit/openstack/devstack-plugin-ceph/commit/?id=dacdc8df02d71791f4f1e96e0a7431a171d728e6
Submitter: Jenkins
Branch: master

commit dacdc8df02d71791f4f1e96e0a7431a171d728e6
Author: Ramana Raja <email address hidden>
Date: Tue Dec 8 20:06:39 2015 +0530

    Allow storage backend to be configurable

    Add configurables so that one need not have Ceph be the storage
    backend for Cinder, Cinder-backup, Glance and Nova.

    Let Ceph be the default storage backend for Cinder, Cinder backup,
    Glance, and Nova. Allow the default setting to be overriden when the
    global config, ENABLE_CEPH_{CINDER,C_BAK,GLANCE,NOVA} is set to
    False in the local.conf/localrc file.

    Closes Bug: #1521278

    Change-Id: I3afe7c57d5d56f15fe533ad5b1dbe36ccd369e6b