centOS 6.4YUM配置

菜鸟奶爸

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


如图 ：执行yum update 或者其他yum 安装命令就报上述错误

yum源为ISO镜像,已经挂载到/media,没有问题。

网上说是DNS不对 我按网上DNS配成了8.8.8.8 还是不行。

请大侠们指导一下。