CentOS 7/8误删python导致yum不可用的解决办法

一、前言

博主Centos系统为Centos8.5.2111版本，可能当时脑抽就以为自己的系统是Centos7版本，安装一个包怎么装不上，网上查阅资料各种折腾，发现yum被我搞坏了，最后又是各种折腾安装yum，特意记录下来。

二、解决办法

卸载和删除python、yum的残留文件，再下载自己系统版本对应的python、yum包进行安装。

三、具体步骤

删除python已安装程序及其关联

rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps

删除残余python文件

whereis python |xargs rm -frv

验证删除，返回为无结果

whereis python

删除现有yum

rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps

删除残余yum文件

whereis yum |xargs rm -frv

查看系统信息

lsb_release -a

Release：8.5.2111 为我自己的Centos版本，下载的包的版本应与系统版本号对应的一致。

下载镜像网址

华为镜像站

https://repo.huaweicloud.com/centos/

Centos7 RPM包路径

https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/

Centos8 RPM包路径（Centos8已经停止维护，去centos/8-stream下面找BaseOS文件夹自己替换路径）

https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/

更改系统版本号为你自己的版本号

创建目录python和yum用以存放rpm包

mkdir /usr/local/src/python
mkdir /usr/local/src/yum

下载python以及yum的rpm包

centos7（由于版本升级一些链接404错误，请自行查找对应的rpm包）:

#python
cd /usr/local/src/python
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/python-2.7.5-88.el7.x86_64.rpm
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/python-devel-2.7.5-88.el7.x86_64.rpm
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/python-libs-2.7.5-88.el7.x86_64.rpm
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/python-urlgrabber-3.10-10.el7.noarch.rpm
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/rpm-python-4.11.3-43.el7.x86_64.rpm
#yum
cd /usr/local/src/yum
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/yum-3.4.3-167.el7.centos.noarch.rpm
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget https://repo.huaweicloud.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-53.el7.noarch.rpm

centos8（由于版本升级一些链接404错误，请自行查找对应的rpm包）:

#python
cd /usr/local/src/python
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/python3-asn1crypto-0.24.0-3.el8.noarch.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/python3-dnf-4.7.0-4.el8.noarch.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/python3-gpg-1.13.1-9.el8.x86_64.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/python3-hawkey-0.63.0-3.el8.x86_64.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/python3-libcomps-0.1.16-2.el8.x86_64.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/python3-libdnf-0.63.0-3.el8.x86_64.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/python3-libs-3.6.8-41.el8.x86_64.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/python3-rpm-4.14.3-19.el8.x86_64.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/platform-python-3.6.8-41.el8.x86_64.rpm
#yum
cd /usr/local/src/yum
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/yum-4.7.0-4.el8.noarch.rpm
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/yum-utils-4.0.21-3.el8.noarch.rpm

安装python以及yum的rpm包

#安装Python
cd /usr/local/src/python
#Centos7
rpm -ivh python-*   rpm-python-* --nodeps --force
#Centos8
rpm -ivh python3-* platform-python-* --nodeps --force
#安装yum
cd /usr/local/src/yum
rpm -ivh yum-*

大功告成！

没有成功的查看以下方法

(来自：Wei.的方法，主页：https://iox7.com/user/131)

#安装yum-utils依赖
mkdir /usr/local/src/yum
cd /usr/local/src/yum
wget https://repo.huaweicloud.com/centos/8.5.2111/BaseOS/x86_64/os/Packages/yum-utils-4.0.21-3.el8.noarch.rpm
rpm -ivh yum-*
#下载全量依赖包
repotrack yum
#安装
rpm -Uvh --force --nodeps *.rpm

四、附件

Centos 8.5.2111 yum的全量依赖包：Centos8系统直接下载以下包执行 rpm -Uvh --force --nodeps *.rpm 安装即可。

下载地址：

链接：https://pan.baidu.com/s/1xX4nMufWT80iH0guoeW2Qw
提取码：yvuz
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