mysql主從賦值，從機驗證報錯：ERROR 3021(HY000):this operation cannot be performed with a running salve io thread

原因：

mysql從機上已經進行過綁定了，如果繼續綁定需要先進行重置。

解決辦法

1、停止已經啟動的綁定

stop slave

2、重置綁定

reset master

3、執行復制主機命令

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、發現此時已經不報錯
5、啟動復制

start slave