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1、将U盘作为本地yum源，首先挂载U盘，确保光盘挂载点有文件
[root@xuexi yum.repos.d]# ls /mnt CentOS_BuildTag EULA images LiveOS
repodata RPM-GPG-KEY-CentOS-Testing-7 EFI GPL isolinux Packages
RPM-GPG-KEY-CentOS-7 TRANS.TBL
2、yum的一切配置信息都存储在一个叫yum.repos.d目录下的配置文件中。所以跳转到/etc/yum.repo.d目录下
cd /etc/yum.repo.d
3、创建一个新的yum源配置文件，yum源配置文件的结尾必须是.repo
vim CentOS7.repo
内容如下：
[CentOS7] //yum的ID，本地唯一，用于区分不同yum源
name=CentOS-server //描述信息
baseurl=file:///mnt //前面的file://是协议，后面的/mnt是光盘挂载点
enabled=1 //1启用yum源，0禁用yum源 gpgcheck=0
//1使用公钥验证rpm包的正确性，0不验证
保存退出后就可以开始验证了。
如果启用公钥验证，需要配置公钥gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7
4、接着清空yum已存在的源信息（缓存）
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[root@xuexi yum.repos.d]# yum clean all
已加载插件：fastestmirror, langpacks
正在清理软件源： CentOS7 base extras updates
Cleaning up everything
Maybe you want: rm -rf /var/cache/yum, to also free up space taken by orphaned
data from disabled or removed repos
Cleaning up list of fastest mirrors
查看本地源的所有软件,由于不太好展示，我只能大概说一下。使用命令” yum list |
more”（注意使用more限制一下输出），列表会有三列输出，在最后一列显示的是yum的ID（这里就是上面的[CentOS7]），有你设置的yum的ID就是成功了。
5、最后yum makecache
