add galera cluster stt method

defaults/main.yml

@@ -137,9 +137,10 @@ 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 
+# Percona
 # -------------------------------------
 mariadb_percona_repository: 'http://repo.percona.com/apt'
 mariadb_use_percona_apt: false

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

@@ -12,8 +12,7 @@
 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
+wsrep_sst_method="{{ mariadb_wsrep_stt_method }}"
 {% if mariadb_wsrep_cluster_name is defined %}
 wsrep_cluster_name="{{ mariadb_wsrep_cluster_name }}"
 {% endif %}