1 创建保存RPM包的路径：
mkdir -p /share/CentOS/7/local/x86_64/RPMS
2 安装createrepo工具
yum install createrepo
3 把RPM包拷贝到 /share/CentOS/7/local/x86_64//RPMS下，并更改目录权限
mv *.rpm /share/CentOS/7/local/x86_64/RPMS
chown -R root.root /share/CentOS/7/local
chmod -R o-w+r /share/CentOS/7/local
4 使用 createrepo 创建元数据
createrepo /share/CentOS/7/local/x86_64
5 更改yum 配置文件
[local]
name=CentOS-$releasever - local packages for $basearch
baseurl=file:///share/CentOS/$releasever/local/$basearch
enabled=1
gpgcheck=0
protect=1
6 更新yum缓存
yum clean all
yum makecache