adds the config_template to galera_server

The change modifies the galera_server template tasks such that it's now
using the config_template action plugin. This change will make so that
config files can be dynamically updated, by a deployer, at run time,
without requiring the need to modify the in tree templates or defaults.

Partially implements: blueprint tunable-openstack-configuration

Change-Id: I6f34dff6e3a8ab8d2aad6a413b9a59f325c1be7b

playbooks/roles/galera_server/defaults/main.yml

@@ -104,3 +104,8 @@ galera_debconf_items:
 # Galera slow/unindexed query logging
 galera_slow_query_logging: 0
 galera_unindexed_query_logging: 0
+
+## Tunable overrides
+galera_my_cnf_overrides: {}
+galera_cluster_cnf_overrides: {}
+galera_debian_cnf_overrides: {}

playbooks/roles/galera_server/tasks/galera_post_install.yml

@@ -28,15 +28,37 @@
   tags:
     - galera-config
 
+- name: Drop mariadb config(s)
+  config_template:
+    src: "{{ item.src }}"
+    dest: "{{ item.dest }}"
+    owner: "root"
+    group: "root"
+    mode: "0644"
+    config_overrides: "{{ item.config_overrides }}"
+    config_type: "{{ item.config_type }}"
+  with_items:
+    - src: my.cnf.j2
+      dest: /etc/mysql/my.cnf
+      config_overrides: "{{ galera_my_cnf_overrides }}"
+      config_type: "ini"
+    - src: cluster.cnf.j2
+      dest: /etc/mysql/conf.d/cluster.cnf
+      config_overrides: "{{ galera_cluster_cnf_overrides }}"
+      config_type: "ini"
+    - src: debian.cnf.j2
+      dest: /etc/mysql/debian.cnf
+      config_overrides: "{{ galera_debian_cnf_overrides }}"
+      config_type: "ini"
+  tags:
+    - galera-client-user-config
+
 - name: Drop mariadb config(s)
   template:
     src: "{{ item.src }}"
     dest: "{{ item.dest }}"
     mode: "{{ item.mode|default('0644') }}"
   with_items:
-    - { src: my.cnf.j2, dest: /etc/mysql/my.cnf }
-    - { src: cluster.cnf.j2, dest: /etc/mysql/conf.d/cluster.cnf }
-    - { src: debian.cnf.j2, dest: /etc/mysql/debian.cnf }
     - { src: mysql_defaults.j2, dest: /etc/default/mysql }
   notify: Restart mysql
   tags: