commit 9d89b0fdb07c2d314ac3a87832fd09be33395214
Author: Dmitriy Rabotyagov <dmitriy.rabotyagov@citynetwork.eu>
Date:   Fri Sep 11 15:27:32 2020 +0300

    Define condition for the first play host one time
    
    We use the same condition, which defines against what host some "service"
    tasks should run against, several times. It's hard to keep it the same
    across the role and ansible spending additional resources to evaluate
    it each time, so it's simpler and better for the maintenance to set
    a boolean variable which will say for all tasks, that we want to run
    only against signle host, if they should run or not now.
    
    Change-Id: I904dca21103b91978ab03db1a3c6d3a30d406aa7

diff --git a/tasks/main.yml b/tasks/main.yml
index 9082434..9bf7c62 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -41,7 +41,7 @@
 
 - import_tasks: db_setup.yml
   when:
-    - inventory_hostname == groups['cloudkitty_all'][0]
+    - _cloudkitty_is_first_play_host
   vars:
     _oslodb_setup_host: "{{ cloudkitty_db_setup_host }}"
     _oslodb_ansible_python_interpreter: "{{ cloudkitty_db_setup_python_interpreter }}"
@@ -58,7 +58,7 @@
 
 - import_tasks: mq_setup.yml
   when:
-    - inventory_hostname == groups['cloudkitty_all'][0]
+    - _cloudkitty_is_first_play_host
   vars:
     _oslomsg_rpc_setup_host: "{{ cloudkitty_oslomsg_rpc_setup_host }}"
     _oslomsg_rpc_userid: "{{ cloudkitty_oslomsg_rpc_userid }}"
@@ -138,13 +138,13 @@
       - name: "{{ cloudkitty_service_name }}"
         type: "rating"
         description: "OpenStack Rating Service"
-  when: inventory_hostname == groups['cloudkitty_all'][0]
+  when: _cloudkitty_is_first_play_host
   tags:
     - cloudkitty-config
 
 - import_tasks: cloudkitty_db_sync.yml
   when:
-    - inventory_hostname == groups['cloudkitty_all'][0]
+    - _cloudkitty_is_first_play_host
   tags:
     - cloudkitty-config
 
diff --git a/vars/main.yml b/vars/main.yml
index 75ffd0f..40bf2a8 100644
--- a/vars/main.yml
+++ b/vars/main.yml
@@ -13,6 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+_cloudkitty_is_first_play_host: "{{ (cloudkitty_services['cloudkitty-api']['group'] in group_names and inventory_hostname == ((groups[cloudkitty_services['cloudkitty-api']['group']] | intersect(ansible_play_hosts)) | list)[0]) | bool }}"
+
 #
 # Compile a list of the services on a host based on whether
 # the host is in the host group and the service is enabled.