安装方法：

1、下载yum安装文件 (若没有此包，可以去阿里镜像或网易镜像下载)

wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-161.el7.centos.noarch.rpmwget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpmwget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-50.el7.noarch.rpmwget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm

2、进行安装yum

rpm -ivh python-iniparse-0.4-9.el7.noarch.rpmrpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpmrpm -ivh yum-3.4.3-161.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-50.el7.noarch.rpm

注意：最后两个包必需同时安装，否则会相互依赖。

3、更新repo文件

进入 /etc/yum.repos.d文件夹下，

修改配置文件名

mv CentOS7-Base-163.repo CentOS7-Base.repo

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