系统或者程序连接数据报错
null, message from server: "Host '192.168.6.68' 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
使用客户端连接数据库
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