Host is blocked because of many connection errors

MySQL 出现：Host ‘XXXXXX’ is blocked because of many connection errors; unblock with ‘mysqladmin flush-hosts’

max_connect_errors 参数含义：如果某一客户端尝试连接此MySQL服务器，但是失败（如密码错误等等）X次，则MySQL会无条件强制阻止此客户端连接

解决方法：
1、set global max_connect_errors=1000; –可以动态修改

当这一客户端成功连接一次MySQL服务器后，针对此客户端的max_connect_errors会清零。

2、 mysqladmin flush-hosts 或者 mysql>flush hosts;