Galera improvements (#28)

* add galera cluster name

* add galera cluster stt method

* disable query cache only when mariadb is 10.0

defaults/main.yml

@@ -137,6 +137,7 @@ mariadb_key_ids: ['0xcbcb082a1bb943db', '0xf1656f24c74cd1d8']
 mariadb_galera_resetup: false
 mariadb_galera_members: []
 mariadb_galera_primary_node: 'change_me' # See: https://github.com/ansible/ansible/issues/17453
+mariadb_wsrep_stt_method: 'rsync'
 
 # -------------------------------------
 # Percona

templates/etc/mysql/conf.d/09-galera.cnf.j2

@@ -12,9 +12,10 @@
 wsrep_on=ON
 wsrep_provider=/usr/lib/galera/libgalera_smm.so
 wsrep_cluster_address=gcomm://{{ mariadb_galera_members | join(",") }}
-# TODO: https://mariadb.com/kb/en/mariadb/galera-cluster-system-variables/#wsrep_sst_method
-wsrep_sst_method=rsync
-# TODO: wsrep_cluster_name="my_wsrep_cluster"
+wsrep_sst_method="{{ mariadb_wsrep_stt_method }}"
+{% if mariadb_wsrep_cluster_name is defined %}
+wsrep_cluster_name="{{ mariadb_wsrep_cluster_name }}"
+{% endif %}
 
 # Node Configuration
 wsrep_node_address="{{ mariadb_wsrep_node_address | default(ansible_default_ipv4.address) }}"
@@ -28,4 +29,6 @@ binlog_format=ROW
 default_storage_engine=InnoDB
 innodb_autoinc_lock_mode=2
 innodb_doublewrite=1
+{% if mariadb_version == '10.0'%}
 query_cache_size=0
+{% endif %}