#挂载光盘至某目录,如/mnt/cdrom
mount /dev/cdrom /mnt/cdrom
#创建配置文件
[root@centos7 ~]#vim /etc/yum.repos.d/centos7.repo
[CentOS7] name=CentOS 7 baseurl=file:///mnt/cdrom gpgcheck=0 enabled=1
mount /dev/cdrom /mnt/cdrom
[CentOS7] name=CentOS 7 baseurl=file:///mnt/cdrom gpgcheck=0 enabled=1