本文主要是介绍CentOS7.5安装yum命令，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
1.卸载现有的python 强制删除已安装程序及其关联rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps强制删除所有残余文件whereis python |xargs rm -frv2.卸载现有的yum强制删除已安装程序及其关联rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps强制删除所有残余文件whereis yum |xargs rm -frv查看自己系统版本的命令：cat /etc/redhat-release3.下载与自己版本对应的rpm包wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/
使用wget命令下载 http://vault.centos.org/7.4.1708/os/x86_64/Packages/libxml2-2.9.1-6.el7_2.3.x86_64.rpm
libxml2-2.9.1-6.el7_2.3.x86_64.rpm
libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm
python-2.7.5-58.el7.x86_64.rpm
python-backports-1.0-8.el7.x86_64.rpm
python-backports-ssl_match_hostname-3.4.0.2-4.el7.noarch.rpm
python-chardet-2.2.1-1.el7_1.noarch.rpm
python-devel-2.7.5-58.el7.x86_64.rpm
python-iniparse-0.4-9.el7.noarch.rpm
python-ipaddress-1.0.16-2.el7.noarch.rpm
python-kitchen-1.1.1-5.el7.noarch.rpm
python-libs-2.7.5-58.el7.x86_64.rpm
python-pycurl-7.19.0-19.el7.x86_64.rpm
python-setuptools-0.9.8-7.el7.noarch.rpm
python-urlgrabber-3.10-8.el7.noarch.rpm
python-virtualenv-1.10.1-4.el7.noarch.rpm
rpm-4.11.3-25.el7.x86_64.rpm
rpm-build-4.11.3-25.el7.x86_64.rpm
rpm-build-libs-4.11.3-25.el7.x86_64.rpm
rpm-libs-4.11.3-25.el7.x86_64.rpm
rpm-python-4.11.3-25.el7.x86_64.rpm
rpm-sign-4.11.3-25.el7.x86_64.rpm
yum-3.4.3-154.el7.centos.noarch.rpm
yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
yum-plugin-aliases-1.1.31-42.el7.noarch.rpm
yum-utils-1.1.31-42.el7.noarch.rpm4.安装命令
rpm -Uvh --replacepkgs *.rpm5.检查是否安装成功
yum
6.更改CentOS阿里云镜像
备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
下载新的 CentOS-Base.repo 到 /etc/yum.repos.d/
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
运行 yum makecache 生成缓存
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