mysql主从赋值，从机验证报错：ERROR 3021(HY000):this operation cannot be performed with a running salve io thread

原因： mysql从机上已经进行过绑定了，如果继续绑定需要先进行重置。 解决办法 1、停止已经启动的绑定 stop slave 2、重置绑定 reset master 3、执行复制主机命令 change master to master_host = '192.168.12.1' master_user = 'slave' ,master_password ='123456' ,master_log_file = 'mysql-bin.000004',master_log_pos = '881' 4、发现此时已经不报错 5、启动复制 start slave