前言

騰訊雲伺服器上的本機python環境被我不小心解除安裝了，而yum依賴python環境，當我重新安裝同版本的python環境後，做了如下操作，沒有解決yum不能使用的問題（no module named yum）：

whereis yum 

whereis python

sudo rm -rf /usr/bin/python 

sudo ln -s /usr/bin/python2.6/bin/python /usr/bin/python

整個重新安裝過程

1、刪除現有的python

rpm -qa|grep python|xargs rpm -ev –allmatches –nodeps ##強制清除已安裝的程式及其關聯

whereis python |xargs rm -frv ##刪除所有殘餘檔案 ##xargs，允許你對輸出執行其他某些命令

whereis python ##驗證刪除，返回無結果說明清除乾淨

2、刪除現有的yum

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

whereis yum |xargs rm -frv

3、檢查CentOS 7版本
cat /etc/centos-release

4、找到對應的依賴下載
http://vault.centos.org/
http://mirrors.163.com/

• python-2.7.5-34.el7.x86_64.rpm
• python-iniparse-0.4-9.el7.noarch.rpm
• python-libs-2.7.5-34.el7.x86_64.rpm
• python-pycurl-7.19.0-17.el7.x86_64.rpm
• python-urlgrabber-3.10-7.el7.noarch.rpm
• rpm-python-4.11.3-17.el7.x86_64.rpm
• yum-3.4.3-132.el7.centos.0.1.noarch.rpm
• yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
• yum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpm

wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/python-2.7.5-34.el7.x86_64.rpm
wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/python-pycurl-7.19.0-17.el7.x86_64.rpm
wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/python-urlgrabber-3.10-7.el7.noarch.rpm
wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/rpm-python-4.11.3-17.el7.x86_64.rpm
wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/python-libs-2.7.5-34.el7.x86_64.rpm
wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/yum-3.4.3-132.el7.centos.0.1.noarch.rpm
wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget https://vault.centos.org/7.2.1511/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-34.el7.noarch.rpm

5、安裝

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

6、驗證