“Host is blocked because of many connection errors”问题解决

=======报错======
[root@ysh-db01 ~]# telnet 192.169.175.21 3336
Trying 192.169.175.21...
Connected to 192.169.175.21.
Escape character is '^]'.
lHost '192.169.175.20' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'Connection closed by foreign host.

=======原因=======

该host上部署的服务因数据库帐号配置错误，导致短时间内连接MySQL服务失败次数超过max_connection_errors参数设定值(默认10)，从而被拒绝。

解决方法

方法一：

刷新记录报错host的文件

mysqladmin -uroot -p -h192.169.175.21 flush-hosts

或

mysql>flush hosts;

注意：数据库主从服务器要确定是被哪个MySQL服务拒绝了，刷新对应的服务器即可,不确定的话就都刷新吧。

方法二：

进入数据库将max_connection_errors参数调高，也可以在my.cnf文件中修改不过需要重启MySQL。

mysql>show variables like '%max_connection_errors%';

mysql>set global max_connect_errors = 1000;

mysql>show variables like '%max_connection_errors%';