一、我们需要查询下rpm库中的yum文件
rpm -qa | grep yum
二、切换到root用户,通过以下命令删除yum文件
rpm -qa | grep yum | xargs rpm -e --nodeps
三、寻找并下载阿里镜像站下以下文件,有可能后面的版本号不同 最好自行搜索,不要复制命令
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-3.4.3-161.el7.centos.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-50.el7.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/yum-utils-1.1.31-50.el7.noarch.rpm
wget https://mirrors.aliyun.com/centos/7/os/x86_64/Packages/python-urlgrabber-3.10-9.el7.noarch.rpm
四、下载完成后,通过以下命令将文件安装到系统中
因为安装会有依赖的问题,所以加上--force参数强制安装
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm yum-3.4.3-