MySQL链接不上报错: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_connect_errors的最大值)中断的数据库连接而导致的阻塞。
解决方式:提高允许的max_connection_errors数量, 在命令行修改max_connection_errors的数量为1000: set global max_connect_errors = 5000;

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