Explicitly enable/disable active/active

As deployers may have usecases with several different backends being
served with the same cinder volume,
we should provide an option to easily override default behaviour

Change-Id: Idc9a71d722b7443cf1437c2d95f75c615b6035a4

defaults/main.yml

@@ -273,6 +273,10 @@ cinder_backend_lvm_inuse: '{{ (cinder_backends|default("")|to_json).find("lvm")
 # cinder_backend_rbd_inuse: True if the current host has an rbd backend
 cinder_backend_rbd_inuse: '{{ (cinder_backends|default("")|to_json).find("cinder.volume.drivers.rbd.RBDDriver") != -1 }}'
 
+# Set to false if you want to explicitly disable active/active cluster
+cinder_active_active_cluster: "{{ cinder_backend_rbd_inuse }}"
+cinder_active_active_cluster_name: ceph
+
 ## Policy vars
 # Provide a list of access controls to merge with the default
 # access controls in the service code.

releasenotes/notes/cinder_active_active_cluster-62674205a3259902.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    Added variables `cinder_active_active_cluster` and
+    `cinder_active_active_cluster_name` that allow to explicitly enable or
+    disable active/active feature, and set cluster name.

templates/cinder.conf.j2

@@ -14,8 +14,8 @@ rootwrap_config = /etc/cinder/rootwrap.conf
 api_paste_config = /etc/cinder/api-paste.ini
 auth_strategy = {{ cinder_auth_strategy }}
 
-{% if cinder_backend_rbd_inuse | bool %}
+{% if cinder_active_active_cluster | bool %}
-cluster = ceph
+cluster = {{ cinder_active_active_cluster_name }}
 {% endif %}
 
 ## Cinder Scheduler