实验前的注意：
主、从、二级从服务器的配置：
[root@master ~]$cat /etc/my.cnf [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 innodb_file_per_table log_bin server-id=1 [root@slave ~]$cat /etc/my.cnf [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 # Settings user and group are ignored when systemd is used. innodb_file_per_table server_id=2 read_only log_bin log_slave_updates [root@slave2 ~]$cat /etc/my.cnf [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 server_id=3主服务器和从服务器实现主从复制，配置和授权：
主服务器： MariaDB [(none)]> grant replication slave on *.* to repluser@'192.168.27.%' identified by 'centos'; Query OK, 0 rows affected (0.00 sec) MariaDB [(none)]> show master logs; +--------------------+-----------+ | Log_name | File_size | +--------------------+-----------+ | mariadb-bin.000001 | 264 | | mariadb-bin.000002 | 401 | +--------------------+-----------+ 2 rows in set (0.00 sec) 中间的从服务器： CHANGE MASTER TO MASTER_HOST='192.168.27.7', MASTER_USER='repluser', MASTER_PASSWORD='centos', MASTER_LOG_FILE='mariadb-bin.000001', MASTER_LOG_POS=245; MariaDB [(none)]> CHANGE MASTER TO -> MASTER_HOST='192.168.27.7', -> MASTER_USER='repluser', -> MASTER_PASSWORD='centos', -> MASTER_LOG_FILE='mariadb-bin.000001', -> MASTER_LOG_POS=245; Query OK, 0 rows affected (0.02 sec) MariaDB [(none)]> start slave; Query OK, 0 rows affected (0.00 sec) MariaDB [(none)]> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.27.7 Master_User: repluser Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mariadb-bin.000002 Read_Master_Log_Pos: 401 Relay_Log_File: mariadb-relay-bin.000003 Relay_Log_Pos: 687 Relay_Master_Log_File: mariadb-bin.000002 Slave_IO_Running: Yes Slave_SQL_Running: Yes Exec_Master_Log_Pos: 401 Relay_Log_Space: 1269 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: 0 MariaDB [(none)]> select user from mysql.user; +----------+ | user | +----------+ | root | | repluser | | root | | | | root | | | | root | +----------+ 7 rows in set (0.00 sec) MariaDB [(none)]> show master logs; +--------------------+-----------+ | Log_name | File_size | +--------------------+-----------+ | mariadb-bin.000001 | 401 | +--------------------+-----------+ 1 row in set (0.00 sec)二级从服务器上的配置：
在从的从服务器上执行： [mysqld] innodb_file_per_table read-only server-id=3 CHANGE MASTER TO MASTER_HOST='192.168.27.17', MASTER_USER='repluser', MASTER_PASSWORD='centos', MASTER_LOG_FILE='mariadb-bin.000001', MASTER_LOG_POS=401;另外有需要云服务器可以了解下创新互联cdcxhl.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。
