1.删除原有的yum
rpm -aq|grep yum|xargs rpm -e --nodeps
2.下载yum安装文件

**访问http://mirrors.163.com根据系统版本查找rpm包

(查看系统版本脚本lsb_release -a)

本文用的centos7所以去http://mirrors.163.com/centos/7/os/x86_64/Packages/ 下找

(其它系统版本不一样会安装失败,所以一定要自己比对)
wget
http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-158.el7.centos.noarch.rpm
wget
http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget
http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm
wget
http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
3.安装
rpm -ivh python-iniparse-0.4-9.el7.noarch.rpm
rpm -ivh yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh yum-3.4.3-158.el7.centos.noarch.rpm
yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm
4.更新repo文件
进入 /etc/yum.repos.d文件夹下,
wget http://mirrors.163.com/.help/CentOS7-Base-163.repo
删除原来的配置文件 rm -rf CentOS-Base.repo
修改新配置文件名 mv CentOS7-Base-163.repo CentOS7-Base.repo

参考https://www.jianshu.com/p/ecf358e9e386
<https://www.jianshu.com/p/ecf358e9e386>

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