mariadb: use add_host to include inactive hosts in shard grouping

In case of running mariadb role with --limit the group_by module will only include the limited hosts and other hosts that are not limited by ansible will not be included.
Using add_host will add all hosts in mariadb group to their shards group

Signed-off-by: Seena Fallah <seenafallah@gmail.com>
Change-Id: I1331698e313bd714a16fc35f38fb579d75b56370
Closes-Bug: #1947589

ansible/group_vars/all.yml

@@ -377,6 +377,9 @@ mariadb_clustercheck_port: "4569"
 mariadb_monitor_user: "haproxy"
 mariadb_default_database_shard_id: 0
 mariadb_default_database_shard_hosts: "{% set default_shard = [] %}{% for host in groups['mariadb'] %}{% if hostvars[host]['mariadb_shard_id'] is not defined or hostvars[host]['mariadb_shard_id'] == mariadb_default_database_shard_id %}{{ default_shard.append(host) }}{% endif %}{% endfor %}{{ default_shard }}"
+mariadb_shard_id: "{{ mariadb_default_database_shard_id }}"
+mariadb_shard_name: "shard_{{ mariadb_shard_id }}"
+mariadb_shard_group: "mariadb_{{ mariadb_shard_name }}"
 mariadb_loadbalancer: "haproxy"
 
 masakari_api_port: "15868"

ansible/roles/mariadb/defaults/main.yml

@@ -123,7 +123,4 @@ enable_mariadb_clustercheck: "{{ enable_haproxy }}"
 ####################
 # Sharding
 ####################
-mariadb_shard_id: "{{ mariadb_default_database_shard_id }}"
-mariadb_shard_name: "shard_{{ mariadb_shard_id }}"
-mariadb_shard_group: "mariadb_{{ mariadb_shard_name }}"
 mariadb_shard_database_user: "{% if mariadb_loadbalancer == 'haproxy' %}{{ database_user }}{% else %}root_{{ mariadb_shard_name }}{% endif %}"

ansible/roles/mariadb/tasks/main.yml

@@ -1,7 +1,9 @@
 ---
 - name: Group MariaDB hosts based on shards
-  group_by:
-    key: "{{ mariadb_shard_group }}"
+  add_host:
+    name: "{{ item }}"
+    groups: "{{ hostvars[item]['mariadb_shard_group'] }}"
+  loop: "{{ groups['mariadb'] }}"
   changed_when: false
 
 - include_tasks: "{{ kolla_action }}.yml"

releasenotes/notes/bug-1947589-52e7a6fa5d82e7fa.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes the generation of ``wsrep_cluster_address`` in ``galera.cnf``
+    when ``--limit`` is used while deploying MariaDB nodes.
+    `LP#1947589 <https://bugs.launchpad.net/kolla-ansible/+bug/1947589>`__