mysql could not be resolved: Name or service not known
问题: mysql DNS反解:skip-name-resolve
错误日志有类似警告:
1.120119 16:26:04 [Warning] IP address '192.168.1.10' could not be resolved: Name or service not known
2.120119 16:26:04 [Warning] IP address '192.168.1.14' could not be resolved: Name or service not known
3.120119 16:26:04 [Warning] IP address '192.168.1.17' could not be resolved: Name or service not known
通过show processlist发现大量类似如下的连接:
1.|592|unauthenticated user|192.168.1.10:35320|NULL|Connect| |login|NULL|
2.|593|unauthenticated user|192.168.1.14:35321|NULL|Connect| |login|NULL|
3.|594|unauthenticated user|192.168.1.17:35322|NULL|Connect| |login|NULL|
skip-name-resolve 参数的作用:不再进行反解析(ip不反解成域名),这样可以加快数据库的反应时间。
修改配置文件添加并需要重启:
[mysqld]
skip-name-resolve
其实就是在[mysqld]下面一行加入skip-name-resolve重启mysql服务就可以了。