最近在部署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。

master_mysql> show variables like 'server_id';

slave_mysql> show variables like 'server_id';

查看是不同的。

但是查看/mysql/data/auto.cnf发现里面的UUID是哦相同的。原因是mysql是直接从节点1上拷贝过来而导致。

解决：mv /mysql/data/auto.cnf /mysql/data/auto.cnf.bak 重启mysql解决

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