MySql Host is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' 解决方法
2014-01-03 17:37
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连接MySQL失败,除了权限问题之外,还遇到这种情况,出错信息:Host XXX is blocked because of many connection errors, unblock with 'mysqladmin flush-hosts'。而且XXX还不是IP地址而是domain
name。MySQL服务器和客户端在同一台测试及其上,连接的时候用的mysql -u root -h ipaddr。
查看机器的hosts配置,确实有domain name映射到本机地址,但是有变化,旧的已经注视掉,但错误信息显示的host name是注释掉的结果,应该跟缓存有关。
原因:MySQL服务器已经从某个host接收了大量中途终止的连接,于是决定终止继续接收来自该host的连接,允许最大的连接错误数为max_connect_errors,通过show variables命令可以查询,一般为10。
1、出现domain name而不是IP的原因是MySQL服务端在接收连接的时候会对客户端作DNS resolve,结果会被mysqld缓存,如果只用IP连接,可以在启动mysqld时加上skip-name-resolve参数(命令行或my.ini)。
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;
name。MySQL服务器和客户端在同一台测试及其上,连接的时候用的mysql -u root -h ipaddr。
查看机器的hosts配置,确实有domain name映射到本机地址,但是有变化,旧的已经注视掉,但错误信息显示的host name是注释掉的结果,应该跟缓存有关。
原因:MySQL服务器已经从某个host接收了大量中途终止的连接,于是决定终止继续接收来自该host的连接,允许最大的连接错误数为max_connect_errors,通过show variables命令可以查询,一般为10。
1、出现domain name而不是IP的原因是MySQL服务端在接收连接的时候会对客户端作DNS resolve,结果会被mysqld缓存,如果只用IP连接,可以在启动mysqld时加上skip-name-resolve参数(命令行或my.ini)。
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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