mkdir 123
mount /dev/cdrom 123
mv CentOS-CR.repo 123
mv CentOS-Debuginfo.repo 123
mv CentOS-Vault.repo 123
mv CentOS-Base.repo 123
mv CentOS-fasttrack.repo 123
mv CentOS-Sources.repo 123
vi CentOS-Media.repo （sed）待完成
yum -y install ntp
yum -y install httpd