mysql 一主多從配置-centos7親測

直接上乾貨，親測！！
1：配置文件在/etc/my.cnf。取消log-bin=mysql-bin前面的註釋。

2：在master機上爲slave機添加一同步帳號（同步賬號是有replication，slave權限即可）

 MariaDB[(none)]>grant replication slave on *.* to 'slave'@'192.168.0.53' identified by 'aaaaaaaa';
				 grant replication slave on *.* to 'slave'@'192.168.0.54' identified by 'aaaaaaaa';
MariaDB[(none)]>flush  privileges;

3 :刷新log，記錄 File，Position

MariaDB[(none)]>FLUSH LOGS;
MariaDB[(none)]>SHOW MASTER STATUS;

4：倒數據庫保持一致
導出：mysqldump -uroot -p --all-datebases > /mnt/stroage_vdb/all.sql
同步：scp ./all.sql 192.168.0.53:/mnt
導入：mysql:source /mnt/all.sql
5：在B主機上將master節點指向A主機

MariaDB[(none)]>CHANGE MASTER TO MASTER_HOST = '192.168.0.52', MASTER_USER = 'slave', MASTER_PASSWORD = 'lAMIikej7QXlQ1th', MASTER_PORT = 3306, MASTER_LOG_FILE = ' mysql-bin.000011',  MASTER_LOG_POS = 154 ;

6：啓動主從同步

MariaDB[(none)]>START SLAVE;

7: 查看狀態是否有兩個yes

MariaDB[(none)]>SHOW SLAVE STATUS;

其他：

異常情況：

問題1：Got fatal error 1236 from master when reading data from binary log: ‘Could not find first log file name in binary log index file’

1.停止從庫binglog同步

 MariaDB[(none)]> stop slave;

2.在主節點刷新log，重新記錄File，Position

 MariaDB[(none)]>flush logs;

3.在從節點更改binlog位置：

 MariaDB[(none)]> CHANGE MASTER TO MASTER_LOG_FILE='mysql-bin.000114',MASTER_LOG_POS=120

4.啓動從庫同步，並查看狀態

 MariaDB[(none)]> start slave
 MariaDB[(none)]>SHOW MASTER STATUS;