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

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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

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