情景：

在操作系统cetos5.6上面安装数据库，需要下载补丁，结果运行yum的命令的时候报错了

[root@ekptest001 ~]# yum install elfutils-libelf*

Loaded plugins: fastestmirror, refresh-packagekit, security

Loading mirror speeds from cached hostfile

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=i386&repo=os error was

14: PYCURL ERROR 6 - "Couldn't resolve host 'mirrorlist.centos.org'"

Error: Cannot find a valid baseurl for repo: base

处理方法：

1、检查该机器的外网情况，外网完全打开的；

2、检查cat  /etc/resolv.conf  dns设置没有问题

[root@ekptest001 ~]# cat  /etc/resolv.conf

# Generated by NetworkManager

nameserver 192.168.31.101

nameserver 8.8.8.8

3、关闭防火墙

service iptables stop

[root@ekptest001 ~]# service iptables stop

iptables: Flushing firewall rules:                                        [  OK  ]

iptables: Setting chains to policy ACCEPT: filter           [  OK  ]

iptables: Unloading modules:                                           [  OK  ]

总结：最后关闭防火墙后，终于可以下载补丁了；

运行：nslookup  mirrorlist.centos.org

Server: 192.168.31.101

Address: 192.168.31.101#53

Non-authoritative answer:

Name: mirrorlist.centos.org

Address: 69.30.193.218

Name: mirrorlist.centos.org

Address: 72.232.223.58

Name: mirrorlist.centos.org

Address: 204.15.73.243

Name: mirrorlist.centos.org

Address: 64.235.47.134

可以显示当前已经可以连接；

--------------------------------------------------------------------------------------------------

IT技术员的理想发展曲线：技术员——技术管理——运营管理——企业战略

个人理念：不做单纯的技术，技术就做管理的技术

ORACLE技术管理QQ群：367875324

-------------------------------------------------------------------------------------------------