被安排去安装centos的服务器，但是却没有网络。
幸好还有之前的光盘镜像，果断 mount -o loop -t iso9660 /root/source_package/CentOS-6.5-x86_64-bin-DVD1.iso CentOs-6.5-CD1/
然后修改文件如下
[root@localhost ~]# cat /etc/yum.repos.d/CentOS-Media.repo
# CentOS-Media.repo#
# This repo can be used with mounted DVD media, verify the mount point for
# CentOS-6. You can use this repo and yum to install items directly off the
# DVD ISO that we release.
#
# To use this repo, put in your DVD and use it with the other repos too:
# yum --enablerepo=c6-media [command]
#
# or for ONLY the media repo, do this:
#
# yum --disablerepo=\* --enablerepo=c6-media [command]
[c6-media]
name=CentOS-$releasever - Media
baseurl=file:///media/CentOS/
file:///media/CentOs-6.5-CD1/
file:///media/CentOs-6.5-CD2/
file:///media/cdrecorder/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6
