#mkdir /mnt/ISO
#mount -o loop /root/CentOS-6.4-x86_64-bin-DVD1.iso /mnt/ISO/
#mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_bak
#vi /etc/yum.repos.d/CentOS-Media.repo
baseurl=file:///mnt/ISO/
gpgcheck=0
enabled=1
原文：http://www.cnblogs.com/cncw/p/3867773.html