puppet-tripleo/releasenotes/notes/change-default-cinder-rbd-b...

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---
upgrade:
- |
The tripleo::profile::base::cinder::volume::rbd::cinder_rbd_backend_host
default value has changed, and no longer defaults to "hostgroup" when
other hiera variables (cinder::backend_host and cinder::host) are
undefined. This ensures cinder's RBD backend_host is only set for
pacemaker (HA) deployments, when tripleo-heat-templates sets
cinder::backend_host to "hostgroup".
When upgrading an existing non-HA deployment, the old "hostgroup" default
value can be preserved by assigning the hiera variable
tripleo::profile::base::cinder::volume::rbd::cinder_rbd_backend_host.
New non-HA deployments should leave this variable unset.