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  • mysql主从切换

    1、修改配置文件
    read-only=1(主库)
    #read-only=1(备库)
     
    2、查询从库状态
    mysql> show processlist ;
     
    mysql> show slave status G
     
     
    3、查询主库状态
    mysql> show processlist;
     
    mysql> show master status G
    *************************** 1. row ***************************
    File: mysql-bin.000004
    Position: 107
    Binlog_Do_DB:
    Binlog_Ignore_DB:
    1 row in set (0.00 sec)
     
    4、从库操作
    mysql> STOP SLAVE IO_THREAD;
     
    mysql> SHOW PROCESSLIST;
     
    确保状态为:has read all relay log
     
    mysql> show slave status G
     
     
    5、查询主库状态
    mysql> show master status G
     
     
    6、从库变主库
    mysql> STOP SLAVE;
     
    mysql> RESET MASTER;
     
    mysql> RESET SLAVE;
     
    mysql> show master status G
    *************************** 1. row ***************************
    File: mysql-bin.000001
    Position: 107
    Binlog_Do_DB:
    Binlog_Ignore_DB:
    1 row in set (0.00 sec)
     
    7、主库变从库
    mysql> RESET MASTER;
    Query OK, 0 rows affected (0.06 sec)
     
    mysql> RESET SLAVE;
    Query OK, 0 rows affected (0.03 sec)
     
    mysql> CHANGE MASTER TO
    -> MASTER_HOST='192.168.1.4',
    -> MASTER_USER='repl',
    -> MASTER_PASSWORD='chengce243',
    -> MASTER_LOG_FILE='mysql-bin.000001',
    -> MASTER_LOG_POS=107;
    Query OK, 0 rows affected (0.05 sec)
     
    mysql> start slave;
    Query OK, 0 rows affected (0.00 sec)
     
    8、重启主和从库
    [root@localhost mysql]# service mysql restart
    Shutting down MySQL….[ OK ]
    Starting MySQL…………….[ OK ]
     
    9、检查主从是否都正常
    主库
    SHOW PROCESSLIST;
    show master status G
     
    从库
    SHOW PROCESSLIST;
    start slave;
    show slave status G
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  • 原文地址:https://www.cnblogs.com/liang545621/p/12606907.html
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