1.挂载光盘

#mount /dev/cdrom /media

2.删除/etc/yum.repos.d/目录下无用的repo文件

3.修改/etc/yum.repos.d/CentOS-Media.repo文件

[c6-media]

name=CentOS-$releasever - Media

baseurl=file:///media/

gpgcheck=1

enabled=1

gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6

4.执行yum clean all

5.执行yum list查看yum服务器是否工作