$ sudo apt-get install software-properties-common
$ sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8
$ sudo add-apt-repository 'deb [arch=amd64,i386] http://mirror.mephi.ru/mariadb/repo/10.5/debian buster main'
$ apt-get update

$ sudo apt-get install mariadb-server rsync

$ sudo vi /etc/mysql/conf.d/galera.cnf

[mysqld]
#mysql settings
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
query_cache_size=0
query_cache_type=0
innodb_flush_log_at_trx_commit=2
innodb_buffer_pool_size=3G
bind-address=192.168.205.32

#Galera settings
wsrep_provider="/usr/lib/galera/libgalera_smm.so"
wsrep_cluster_name="shgn_cluster"
wsrep_cluster_address="gcomm://192.168.205.32,192.168.205.31,192.168.205.33"
wsrep_sst_method=rsync
wsrep_on=ON
wsrep_node_address="192.168.205.32"
wsrep_node_name="db12"
</code>

[mysqld]
#mysql settings
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
query_cache_size=0
query_cache_type=0
innodb_flush_log_at_trx_commit=2
innodb_buffer_pool_size=3G
bind-address=192.168.205.33

#Galera settings
wsrep_provider="/usr/lib/galera/libgalera_smm.so"
wsrep_cluster_name="shgn_cluster"
wsrep_cluster_address="gcomm://192.168.205.32,192.168.205.31,192.168.205.33"
wsrep_sst_method=rsync
wsrep_on=ON
wsrep_node_address="192.168.205.33"
wsrep_node_name="db22"

[mysqld]
#mysql settings
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
query_cache_size=0
query_cache_type=0
innodb_flush_log_at_trx_commit=2
innodb_buffer_pool_size=3G
bind-address=192.168.205.31

#Galera settings
wsrep_provider="/usr/lib/galera/libgalera_smm.so"
wsrep_cluster_name="shgn_cluster"
wsrep_cluster_address="gcomm://192.168.205.32,192.168.205.31,192.168.205.33"
wsrep_sst_method=rsync
wsrep_on=ON
wsrep_node_address="192.168.205.31"
wsrep_node_name="db32"

$ sudo service mysql stop

$ sudo galera_new_cluster

$ sudo /usr/bin/galera_new_cluster

$ sudo ps aux | grep mysql

mysql 10587 14.0 15.5 1266120 155268 ? Ssl 01:50 0:00 /usr/sbin/mysqld --wsrep-new-cluster --wsrep_start_position=00000000-0000-0000-0000-000000000000:-1
root 20822 0.0 0.0 12948 980 pts/0 S+ 01:22 0:00 grep --color=auto mysql</code>

$ sudo service mysql start

$ mysql -u root -p -e "SHOW STATUS LIKE 'wsrep_cluster_size';"
Enter password:
+--------------------+-------+
| Variable_name      | Value |
+--------------------+-------+
| wsrep_cluster_size | 3     |
+--------------------+-------+