add galera.cnf for first node

mariadb.yml

@@ -4,3 +4,10 @@
   become: True
   roles:
       - mariadb
+  vars:
+      hostname_node0: "{{ hostvars[groups['mariadb'][0]]['ansible_hostname'] }}"
+      hostname_node1: "{{ hostvars[groups['mariadb'][1]]['ansible_hostname'] }}"
+      hostname_node2: "{{ hostvars[groups['mariadb'][2]]['ansible_hostname'] }}"
+      ip_node0: "hostvars[groups['databases'][0]]['listen_ip'] | default(hostvars[groups['databases'][0]]['ansible_default_ipv4']['address'])"
+      ip_node1: "hostvars[groups['databases'][1]]['listen_ip'] | default(hostvars[groups['databases'][1]]['ansible_default_ipv4']['address'])"
+      ip_node2: "hostvars[groups['databases'][2]]['listen_ip'] | default(hostvars[groups['databases'][2]]['ansible_default_ipv4']['address'])"

roles/mariadb/tasks/main.yml

@@ -31,6 +31,20 @@
     dest: /srv/mariadb/etc/mysql
     mode: 660
 
+- name: Set galara.cnf on first node if we have at least three nodes.
+  copy:
+    src: files/galera-master.cnf
+    dest: /srv/mariadb/etc/mysql/conf.d/galera.cnf
+    mode: 660
+  when: ansible_nodename == hostname_node0 and hostvars[groups['mariadb']]|length >= 3
+
+- name: Set galara.cnf on other nodes if we have at least three nodes.
+  copy:
+    src: files/galera-slave.cnf
+    dest: /srv/mariadb/etc/mysql/conf.d/galera.cnf
+    mode: 660
+  when: ansible_nodename != hostname_node0 and hostvars[groups['mariadb']]|length >= 3
+
 - command: systemctl daemon-reload
 
 - name: make sure service is started

test_hosts

@@ -1,5 +1,7 @@
 [databases]
+ansible-test
 ansible-test-2
+ansible-test-3
 
 [keystone]
 ansible-test-3