linux安装软件时提示找不到镜像的问题：Couldn't resolve host 'mirrorlist.centos.org'

问题：

[root@cddserver2 ~]#
yum -y install gcc-*

Loaded plugins: fastestmirror, presto

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=6&arch=x86_64&repo=os
error was

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

Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again

原因：

dns服务器没有配置正确

解决办法：

1、打开文件/etc/resolv.conf在其中添加：

nameserver 8.8.8.8

nameserver 8.8.4.4

search localdomain

2、然后重启网卡：使用命令: service network restart