[root@localhost ~]# vim /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.117.129 mg2
192.168.117.128 mg1

[root@localhost ~]# curl -sS https://downloads.mariadb.com/MariaDB/mariadb_repo_setup |  sudo bash -s -- --mariadb-maxscale-version="2.4"  --mariadb-server-version="mariadb-10.4"
[info] Repository file successfully written to /etc/yum.repos.d/mariadb.repo
[info] Adding trusted package signing keys...
[info] Successfully added trusted package signing keys

[root@localhost ~]# yum install MariaDB-server MariaDB-client galera-4 MariaDB-backup 

[root@localhost ~]# vim /etc/my.cnf.d/server.cnf 
[galera]
# Mandatory settings
wsrep_on=ON
wsrep_provider=/usr/lib64/galera-4/libgalera_smm.so
wsrep_cluster_address="gcomm://192.168.117.128,192.168.117.129"
binlog_format=row
default_storage_engine=InnoDB
innodb_autoinc_lock_mode=2
innodb_flush_log_at_trx_commit=0
wsrep_cluster_name=galeracluster
#注意其他节点替换IP
wsrep_node_name=192.168.117.128
wsrep_node_address=192.168.117.128

[root@localhost ~]# galera_new_cluster 

[root@localhost ~]# mysql_secure_installation 

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB
      SERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current
password for the root user. If you've just installed MariaDB, and
haven't set the root password yet, you should just press enter here.

Enter current password for root (enter for none): 
OK, successfully used password, moving on...

Setting the root password or using the unix_socket ensures that nobody
can log into the MariaDB root user without the proper authorisation.

You already have your root account protected, so you can safely answer 'n'.

Switch to unix_socket authentication [Y/n] n
 ... skipping.

You already have your root account protected, so you can safely answer 'n'.

Change the root password? [Y/n] Y
New password: 
Re-enter new password: 
Password updated successfully!
Reloading privilege tables..
 ... Success!


By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.

Remove anonymous users? [Y/n] Y
 ... Success!

Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.

Disallow root login remotely? [Y/n] n
 ... skipping.

By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.

Remove test database and access to it? [Y/n] Y
 - Dropping test database...
 ... Success!
 - Removing privileges on test database...
 ... Success!

Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.

Reload privilege tables now? [Y/n] Y
 ... Success!

Cleaning up...

All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.

Thanks for using MariaDB!
[root@localhost ~]# systemctl start mariadb
[root@localhost ~]# systemctl enable mariadb

[root@localhost ~]# systemctl start mariadb
[root@localhost ~]# systemctl enable mariadb

[root@localhost ~]# galera_new_cluster
#节点重新引导后会生成/var/lib/mysql/gvwstate.dat
[root@localhost ~]# find / -name gvwstate.dat
/var/lib/mysql/gvwstate.dat
[root@localhost ~]# systemctl start mariadb

MariaDB [(none)]>  SHOW  GLOBAL  STATUS  LIKE  'wsrep_%'\G;
...省略输出...
MariaDB [(none)]> show status like "wsrep_incoming_addresses";
+--------------------------+-----------+
| Variable_name            | Value     |
+--------------------------+-----------+
| wsrep_incoming_addresses | AUTO,AUTO |
+--------------------------+-----------+
1 row in set (0.001 sec)

MariaDB [(none)]> show status like "wsrep_cluster_size";
+--------------------+-------+
| Variable_name      | Value |
+--------------------+-------+
| wsrep_cluster_size | 2     |
+--------------------+-------+
1 row in set (0.001 sec)