在部署MySQL主从复制架构的时候,碰到了"Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work." 这个错误提示。
即主从架构中使用了相同的UUID。检查server_id系统变量,已经是不同的设置,那原因是?接下来为具体描述。
1、错误消息 mysql> show slave staus; Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for replication to work. 2、查看主从的server_id变量 master_mysql> show variables like 'server_id'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id | 10 | +---------------+-------+ slave_mysql> show variables like 'server_id'; +---------------+-------+ | Variable_name | Value | +---------------+-------+ | server_id | 11 | +---------------+-------+ -- 从上面的情形可知,主从mysql已经使用了不同的server_id 3、解决故障 ###查看auto.cnf文件 [root@dbsrv1 ~] cat /data/mysqldata_3306/auto.cnf ### 主上的uuid [auto] server-uuid=9a5386d8-cd13-11e8-96cb-c68297e2a5d7 [root@dbsrv2 ~]# more /data/mysqldata_3306/auto.cnf ###从上的uuid,果然出现了重复,原因是克隆了虚拟机,只改server_id不行 [auto] server-uuid=9a5386d8-cd13-11e8-96cb-c68297e2a5d7 [root@dbsrv2 ~]# mv /data/mysqldata/auto.cnf{,.20181031} ###重命名该文件 [root@dbsrv2 ~]# service mysql restart ###重启mysql Shutting down MySQL.[ OK ] Starting MySQL.[ OK ] [root@dbsrv2 ~]# more /data/mysqldata/auto.cnf ###重启后自动生成新的auto.cnf文件,即新的UUID [auto] server-uuid=6ac0fdae-b5d7-11e4-a9f3-0800278ce5c9 ###再次查看slave的状态已经正常 [root@dbsrv1 ~]# mysql -uroot -pxxx -e "show slave statusG"|grep Running Warning: Using a password on the command line interface can be insecure. Slave_IO_Running: Yes Slave_SQL_Running: Yes Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it ###主库端查看自身的uuid master_mysql> show variables like 'server_uuid'; +---------------+--------------------------------------+ | Variable_name | Value | +---------------+--------------------------------------+ | server_uuid |9a5386d8-cd13-11e8-96cb-c68297e2a5d7 | +---------------+--------------------------------------+ 1 row in set (0.00 sec) ###主库端查看从库的uuid master_mysql> show slave hosts; +-----------+------+------+-----------+--------------------------------------+ | Server_id | Host | Port | Master_id | Slave_UUID | +-----------+------+------+-----------+--------------------------------------+ | 11 | | 3306 | 10 | 8691da38-dce7-11e8-be00-9268b554fce7 | +-----------+------+------+-----------+--------------------------------------+