Add galera_data_dir variable

Control mysql datadir with variable. Decrease code dublication since path
is heavily used in different places. If path needs to be changed
overriding config won't be enough.

Change-Id: I6fcefe216236ffea60da5fee42aad47c6f7da133

defaults/main.yml

@@ -97,6 +97,7 @@ galera_root_user: root
 # WARNING: This option is deprecated and will be removed in v12.0
 galera_gcache_size: 1024M
 
+galera_data_dir: /var/lib/mysql
 galera_max_heap_table_size: 32M
 galera_tmp_table_size: 32M
 galera_tmp_dir: /var/lib/mysql/#tmp

releasenotes/notes/galera_data_dir-98c9606407532be0.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Implemented variable ``galera_data_dir`` that control datadir for MariaDB
+    databases. Defaults to `/var/lib/mysql`.

tasks/galera_server_post_install.yml

@@ -93,7 +93,7 @@
 - name: Run galera secure
   command: "/usr/local/bin/galera_secure_node"
   args:
-    creates: "/var/lib/mysql/osa_default_secured"
+    creates: "{{ galera_data_dir }}/osa_default_secured"
     warn: no
   when:
     - ansible_facts['pkg_mgr'] != "apt"
@@ -110,7 +110,7 @@
     mode: "{{ item.mode|default('0755') }}"
     recurse: "{{ item.recurse|default('false') }}"
   with_items:
-    - { path: "/var/lib/mysql", owner: "mysql", mode: "02755" }
+    - { path: "{{ galera_data_dir }}", owner: "mysql", mode: "02755" }
     - { path: "{{ galera_tmp_dir }}", owner: "mysql", mode: "02755" }
     - { path: "/etc/mysql/conf.d" }
 

tasks/galera_server_setup.yml

@@ -27,7 +27,7 @@
 #                      need to wait for it to finish to avoid race conditions
 - name: Wait for MySQL Upgrade to finish
   wait_for:
-    path: /var/lib/mysql/mysql_upgrade_info
+    path: "{{ galera_data_dir }}/mysql_upgrade_info"
     search_regex: "^{{ galera_major_version }}.{{ galera_minor_version }}"
 
 # NOTE(noonedeadpunk): We don't need to verify hostname when connectig to socket

templates/galera_secure_node.j2

@@ -43,4 +43,4 @@ fi
 
 # Create a marker file to ensure this script is not run again
 systemctl unset-environment MYSQLD_OPTS
-touch "/var/lib/mysql/osa_default_secured"
+touch "{{ galera_data_dir }}/osa_default_secured"

templates/my.cnf.j2

@@ -27,7 +27,7 @@ user = mysql
 collation-server = utf8_general_ci
 init-connect = 'SET NAMES utf8'
 character-set-server = utf8
-datadir = /var/lib/mysql
+datadir = {{ galera_data_dir }}
 tmpdir = {{ galera_tmp_dir }}
 ignore_db_dirs = {{ galera_ignore_db_dirs | join(',') }}
 
@@ -45,8 +45,8 @@ ssl-key = {{ galera_ssl_key }}
 # LOGGING #
 log-queries-not-using-indexes = {{ galera_unindexed_query_logging }}
 slow-query-log = {{ galera_slow_query_logging }}
-log-bin = /var/lib/mysql/mariadb-bin
-log-bin-index = /var/lib/mysql/mariadb-bin.index
+log-bin = {{ galera_data_dir }}/mariadb-bin
+log-bin-index = {{ galera_data_dir }}/mariadb-bin.index
 expire-logs-days = 7
 log_slave_updates = 1
 log_bin_trust_function_creators = 1

vars/redhat.yml

@@ -36,7 +36,7 @@ galera_server_required_distro_packages:
 
 galera_etc_conf_file: "/etc/mysql/my.cnf"
 galera_etc_include_dir: "/etc/mysql/conf.d"
-galera_var_run_socket: "/var/lib/mysql/mysql.sock"
+galera_var_run_socket: "{{ galera_data_dir }}/mysql.sock"
 
 _galera_mariadb_server_package: "MariaDB-server"
 
@@ -74,4 +74,4 @@ galera_client_distro_packages:
 galera_devel_distro_packages:
   - MariaDB-devel
 
-galera_unix_socket: "/var/lib/mysql/mysql.sock"
+galera_unix_socket: "{{ galera_data_dir }}/mysql.sock"