一、

安装好三个MariaDB数据库

如何使用“Ubuntu 20.04桌面版，安装MariaDB数据库“？win10系统？-CSDN博客

二、第一个node1，修改

sudo nano /etc/mysql/conf.d/galera.cnf

[mysqld]
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0
 
# Galera Provider Configuration
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so
 
# Galera Cluster Configuration
wsrep_cluster_name="galera_cluster"
wsrep_cluster_address="gcomm://node1_ip_address,node2_ip_address,node2_ip_address"
 
# Galera Synchronization Configuration
wsrep_sst_method=rsync
 
# Galera Node Configuration
wsrep_node_address="node1_ip_address"
wsrep_node_name="node1"

按 Ctrl + X 键：保存更改，按 Y 键，然后按回车键。不想要保存更改，按 N 键，然后按回车键

三、第二个node2修改

sudo nano /etc/mysql/conf.d/galera.cnf

[mysqld]
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0
 
# Galera Provider Configuration
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so
 
# Galera Cluster Configuration
wsrep_cluster_name="galera_cluster"
wsrep_cluster_address="gcomm://node1_ip_address,node2_ip_address,node2_ip_address"
 
# Galera Synchronization Configuration
wsrep_sst_method=rsync
 
# Galera Node Configuration
wsrep_node_address="node2_ip_address"
wsrep_node_name="node2"

四、第三个node3修改

sudo nano /etc/mysql/conf.d/galera.cnf

[mysqld]
binlog_format=ROW
default-storage-engine=innodb
innodb_autoinc_lock_mode=2
bind-address=0.0.0.0
 
# Galera Provider Configuration
wsrep_on=ON
wsrep_provider=/usr/lib/galera/libgalera_smm.so
 
# Galera Cluster Configuration
wsrep_cluster_name="galera_cluster"
wsrep_cluster_address="gcomm://node1_ip_address,node2_ip_address,node2_ip_address"
 
# Galera Synchronization Configuration
wsrep_sst_method=rsync
 
# Galera Node Configuration
wsrep_node_address="node3_ip_address"
wsrep_node_name="node3"

sudo su

systemctl stop mariadb

galera_new_cluster

mysql -u root -p -e "SHOW STATUS LIKE 'wsrep_cluster_size'"

systemctl start mariadb

create database db1;

create database db2;

mysql -u root -p

show databases;