update: avoid skipping single mds deployment upgrade

otherwise a single MDS would never be updated.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>

infrastructure-playbooks/rolling_update.yml

@@ -542,13 +542,16 @@
   become: true
   tasks:
     - name: deactivate all mds rank > 0
-      when: groups.get(mds_group_name, []) | length > 1
+      when: groups.get(mds_group_name, []) | length > 0
       block:
         - import_role:
             name: ceph-defaults
         - import_role:
             name: ceph-facts
 
+        - name: deactivate all mds rank > 0 if any
+          when: groups.get(mds_group_name, []) | length > 1
+          block:
             - name: set max_mds 1 on ceph fs
               command: "{{ container_exec_cmd | default('') }} ceph --cluster {{ cluster }} fs set {{ cephfs }} max_mds 1"
               changed_when: false
@@ -571,13 +574,6 @@
                 mds_active_name: "{{ [(_mds_active_name.stdout | from_json)['filesystems'][0]['mdsmap']['info'][item.key]['name']] }}"
               with_dict: "{{ (_mds_active_name.stdout | from_json).filesystems[0]['mdsmap']['info'] }}"
 
-        - name: create active_mdss group
-          add_host:
-            name: "{{ mds_active_name[0] }}"
-            groups: active_mdss
-            ansible_host: "{{ hostvars[mds_active_name]['ansible_host'] | default(omit) }}"
-            ansible_port: "{{ hostvars[mds_active_name]['ansible_port'] | default(omit) }}"
-
             - name: create standby_mdss group
               add_host:
                 name: "{{ item }}"
@@ -613,6 +609,13 @@
               delay: 5
               until: (wait_standbys_down.stdout | from_json).standbys | length == 0
 
+        - name: create active_mdss group
+          add_host:
+            name: "{{ mds_active_name[0] if mds_active_name is defined else groups.get(mds_group_name)[0] }}"
+            groups: active_mdss
+            ansible_host: "{{ hostvars[mds_active_name]['ansible_host'] | default(omit) }}"
+            ansible_port: "{{ hostvars[mds_active_name]['ansible_port'] | default(omit) }}"
+
 
 - name: upgrade active mds
   vars: