Fix MariaDB galera IPv6 deployment on CentOS 7

CentOS 7 uses old galera which has multiple issues handling
IPv6 addressing.
This patch applies two workarounds for CentOS 7.

Co-Authored-By: Jeffrey Zhang <jeffrey.zhang@99cloud.net>
Co-Authored-By: Radosław Piliszek <radoslaw.piliszek@gmail.com>
Change-Id: I7c178aba60c389e65075e0e6cbe4dfa5b8ce06ec
Closes-Bug: #1856532
Signed-off-by: yj.bai <bai.yongjun@99cloud.net>

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

@@ -28,10 +28,23 @@ datadir=/var/lib/mysql/
 
 wsrep_cluster_address=gcomm://{% if (groups['mariadb'] | length) > 1 %}{% for host in groups['mariadb'] %}{{ 'api' | kolla_address(host) | put_address_in_context('url') }}:{{ mariadb_wsrep_port }}{% if not loop.last %},{% endif %}{% endfor %}{% endif %}
 
+{% if api_address_family == 'ipv6' and kolla_base_distro == 'centos' %}
+# 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 }}
+{% 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 }}
+{% endif %}
 
 wsrep_node_address={{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_wsrep_port }}
+{% if api_address_family == 'ipv6' and kolla_base_distro == 'centos' %}
+# FIXME(yj.bai): Revert when using C8 (CentOS+Ussuri)
+# Use IPv6-resolvable hostname to avoid galera issue.
+wsrep_sst_receive_address={{ ansible_hostname }}:{{ mariadb_sst_port }}
+{% else %}
 wsrep_sst_receive_address={{ api_interface_address | put_address_in_context('url') }}:{{ mariadb_sst_port }}
+{% endif %}
 
 wsrep_provider={{ wsrep_driver }}
 wsrep_cluster_name="{{ database_cluster_name }}"