Allow setting additional galera WSREP options

Change-Id: I26206bece95d31c0182e75f2a585c50d6f0fad6f

ansible/roles/mariadb/defaults/main.yml

@@ -69,6 +69,11 @@ mariadb_extra_volumes: "{{ default_extra_volumes }}"
 ########################################
 mariadb_service: "{{ mariadb_services['mariadb'] }}"
 
+###############
+# WSREP options
+###############
+mariadb_wsrep_extra_provider_options: []
+
 ####################
 # Backups
 ####################

ansible/roles/mariadb/templates/galera.cnf.j2

@@ -32,9 +32,9 @@ wsrep_cluster_address=gcomm://{% if (groups['mariadb'] | length) > 1 %}{% for ho
 # FIXME(jeffrey4l): Revert when using C8 (CentOS+Ussuri)
 # Use [::] to avoid galera issue.
 # for more info see https://github.com/codership/galera/issues/534#issuecomment-472607544
-wsrep_provider_options=gmcast.listen_addr=tcp://[::]:{{ mariadb_wsrep_port }};ist.recv_addr={{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_ist_port }}
+wsrep_provider_options=gmcast.listen_addr=tcp://[::]:{{ mariadb_wsrep_port }};ist.recv_addr={{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_ist_port }};{% for option in mariadb_wsrep_extra_provider_options %}{{ option }}{% if not loop.last %};{% endif %}{% endfor %}
 {% else %}
-wsrep_provider_options=gmcast.listen_addr=tcp://{{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_wsrep_port }};ist.recv_addr={{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_ist_port }}
+wsrep_provider_options=gmcast.listen_addr=tcp://{{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_wsrep_port }};ist.recv_addr={{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_ist_port }};{% for option in mariadb_wsrep_extra_provider_options %}{{ option }}{% if not loop.last %};{% endif %}{% endfor %}
 {% endif %}
 
 wsrep_node_address={{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_wsrep_port }}

etc/kolla/globals.yml

@@ -362,6 +362,12 @@
 # to configure IPv6 in RabbitMQ server.
 #rabbitmq_server_additional_erl_args: ""
 
+#################
+# MariaDB options
+#################
+# List of additional WSREP options
+#mariadb_wsrep_extra_provider_options: []
+
 #######################
 # External Ceph options
 #######################

releasenotes/notes/mariadb_wsrep_extra_provider_options-27c2804e4505aed1.yaml

+---
+features:
+  - |
+    Introduce new configuration variable `mariadb_wsrep_extra_provider_options`
+    allowing users to set additional WSREP options.