[root@localhost ~]# mount /dev/cdrom /media/cdrom/mount: /dev/sr0 寫保護，將以只讀方式掛載

[root@localhost /]# cd /etc/yum.repos.d/[root@localhost yum.repos.d]# mkdir bak　　　　#創建一個文件夾來存放多余的配置文件[root@localhost yum.repos.d]# mv *.* bak/　　　　　　[root@localhost yum.repos.d]# cd bak/[root@localhost bak]# lsCentOS-Base.repo CentOS-Debuginfo.repo CentOS-Media.repo CentOS-Vault.repoCentOS-CR.repo CentOS-fasttrack.repo CentOS-Sources.repo[root@localhost bak]# mv CentOS-Media.repo ../[root@localhost bak]# cd ../[root@localhost yum.repos.d]# vi CentOS-Media.repo # CentOS-Media.repo## This repo can be used with mounted DVD media, verify the mount point for# CentOS-7. 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=c7-media [command]## or for ONLY the media repo, do this:## yum --disablerepo=/* --enablerepo=c7-media [command][c7-media]name=CentOS-$releasever - Mediabaseurl=file:///media/CentOS/file:///media/cdrom/　　#本地yum源所在路徑file:///media/cdrecorder/gpgcheck=0 #這里為0不進行檢查enabled=1　　　#這里為1　　啟動gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7~ 

[root@localhost /]# yum list 　　#后面東西太多了。。。