MySQL无法连接[MySql Host is blocked because of many connection errors]

叁歲伎倆 2022-08-20 09:18 33阅读 0赞

测试环境，发现数据库（MySQL数据库）无法登录，报错如下：

Host is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'

上网查到解决方案，转载如下：[http://www.cnblogs.com/susuyu/archive/2013/05/28/3104249.html][http_www.cnblogs.com_susuyu_archive_2013_05_28_3104249.html]

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【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】  
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\_connection\_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\_connection\_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;

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实际操作中发现，最简单、快速的方式：

root帐号登录数据库（navicat），执行语句\[**flush hosts**\]即可。

但还是有一点，每隔一段时间，还是出现该问题，至今仍没彻底解决。

[http_www.cnblogs.com_susuyu_archive_2013_05_28_3104249.html]: http://www.cnblogs.com/susuyu/archive/2013/05/28/3104249.html

MySQL无法连接[MySql Host is blocked because of many connection errors]

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