centos7誤刪除python2.7后導致yum不可用：

問題截圖

解決方法：

1、在opt目錄下創建site_package/python3遞歸目錄，然后下載以下RPM包，并存入/opt/site_package/python3目錄中

http://vault.centos.org/7.5.1804/os/x86_64/Packages/lvm2-python-libs-2.02.177-4.el7.x86_64.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/libxml2-python-2.9.1-6.el7_2.3.x86_64.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-libs-2.7.5-68.el7.x86_64.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-ipaddress-1.0.16-2.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-backports-1.0-8.el7.x86_64.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-2.7.5-68.el7.x86_64.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-setuptools-0.9.8-7.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/python-chardet-2.2.1-1.el7_1.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/rpm-python-4.11.3-32.el7.x86_64.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-utils-1.1.31-45.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-3.4.3-158.el7.centos.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-plugin-aliases-1.1.31-45.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-45.el7.noarch.rpm
http://vault.centos.org/7.5.1804/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm

2、執行下面的命令，安裝python開頭的RPM包
執行下面的命令

          
            rpm -Uvh --replacepkgs python*.rpm

          
        

3、刪除原有yum源

          
            rpm -aq
            
              |
            
            
              grep
            
             yum
            
              |
            
            
              xargs
            
             rpm -e --nodeps

          
        

4、安裝rpm-python起始， yum起始開頭的RPM包
–force 即使覆蓋屬于其它包的文件也強迫安裝
–nodeps 如果該RPM包的安裝依賴其它包，即使其它包沒裝，也強迫安裝

          
            rpm -Uvh --replacepkgs rpm-python*.rpm yum*.rpm --force --nodeps

          
        

5、將yum源配置為阿里的開源鏡像

          
            備份原來的鏡像源

            
              cd
            
             /etc/yum.repos.d/

            
              mv
            
             CentOS-Base.repo CentOS-Base.repo.back

          
        

6、下載阿里yum源

          
            
              wget
            
             http://mirrors.aliyun.com/repo/Centos-7.repo

          
        

將Centos-7.repo重命名為CentOS-Base.repo

清除系統所有的yum緩存

          
            yum clean all

          
        

生成yum緩存

          
            yum makecache

          
        

7、安裝epel源

          
            yum 
            
              install
            
             -y epel-release

          
        

使用阿里開源鏡像提供的epel源
wget -O /etc/yum.repos.d/epel-7.repo http://mirrors.aliyun.com/repo/epel-7.repo

再次清除系統yum緩存，并重新生成新的yum緩存

          
            yum clean all
yum makecache

          
        

查看系統可用的yum源和所有的yum源

          
            yum repolist enabled

          
        

8、現在可以正常使用python2.7了