MySql Host is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
错误：Host is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
原因：同一个ip在短时间内产生太多（超过mysql数据库max_connection_errors的最大值）中断的数据库连接而导致的阻塞；
解决方法：
使用mysqladmin flush-hosts 命令清理一下hosts文件（不知道mysqladmin在哪个目录下可以使用命令查找：whereis mysqladmin）；
① 在查找到的目录下使用命令修改：/usr/bin/mysqladmin flush-hosts -h192.168.1.1 -P3306 -uroot -prootpwd;
备注：
其中3306端口号，root用户名，rootpwd密码都可以根据需要来添加和修改；
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