because of many connection errors; unblock with 'mysqladmin flush-hosts
环境：linux，mysql5.5.37
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：
1、提高允许的max_connection_errors数量（治标不治本）：
① 进入Mysql数据库查看max_connection_errors： show variables like '%max_connect_errors%';
② 修改max_connection_errors的数量为1000： set global max_connect_errors = 1000;
③ 查看是否修改成功：show variables like '%max_connect_errors%';
2、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 -P3308 -uroot -prootpwd;
备注：
其中端口号，用户名，密码都可以根据需要来添加和修改；
配置有master/slave主从数据库的要把主库和从库都修改一遍的（我就吃了这个亏明明很容易的几条命令结果折腾了大半天）；
第二步也可以在数据库中进行，命令如下：flush hosts;
from http://www.cnblogs.com/susuyu/archive/2013/05/28/3104249.html
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