mysql “Host is blocked because of many connection errors”

1.提高允许的max_connection_errors数量，首先查看该属性设置为多大

命令：show global variables like '%max_connect_errors%';

2.当客户端连接服务端超时(超过connect_timeout), 服务端就会给这个客户端记录一次error，当出错的次数达到max_connect_errors的时候，这个客户端就会被锁定。所以根据业务来尽量把这个值设置大一点，mysql默认值为10，我们可以根据具体需要设置大一点，这里设置为1000.（并非越大越好，越大被攻击时安全性越低）。使用命令：set global max_connect_errors=1000;

3.设置后立马生效。这里我们可以查看一下，是否修改成功，使用命令：show global variables like '%max_connect_errors%';

4.到这一步，就解决了问题了。如果需要永久生效，得去修改mysql配置文件里相应属性。可能配置文件里没有这个属性，需要自己手动添加

6.

也可以使用清楚缓存的方法。这样就会把计数清理掉。

命里一，到安装bin目录下，使用mysqladmin -u root -p flush-hosts命里

输入密码后，即完成清楚缓存。
7.

也可以进入mysql控制台，执行：flush hosts;

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