我的系統(tǒng)誤刪了yum和python后導(dǎo)致yum包管理器不能使用，在網(wǎng)上找了好多教程，因?yàn)镃entos 7已經(jīng)不維護(hù)了，好多rpm包都是404頁(yè)面，找了好久才找到下面可以下載所有rpm包的網(wǎng)站，如果有其它問(wèn)題缺rpm包的也可以去https://vault.centos.org/7.9.2009/os/x86_64去找，不過(guò)自己修改一下系統(tǒng)版本就好了
1. 刪除現(xiàn)有Python
rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps ## 強(qiáng)制刪除已安裝程序及其關(guān)聯(lián)
whereis python |xargs rm -frv ## 刪除所有殘余文件 ## xargs，允許你對(duì)輸出執(zhí)行其他命令
whereis python ## 驗(yàn)證刪除
2. 刪除現(xiàn)有Yum
rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps ## 強(qiáng)制刪除已安裝程序及其關(guān)聯(lián)
whereis yum |xargs rm -frv ## 刪除所有殘余文件 ## xargs，允許你對(duì)輸出執(zhí)行其他命令
whereis yum ## 驗(yàn)證刪除
3. 檢查系統(tǒng)版本
cat /etc/redhat-release ## 檢查系統(tǒng)版本
4. 下載對(duì)應(yīng)版本的20個(gè)RPM包
注：我這里的版本是7.9.2009，將下面所有7.9.2009改成自己系統(tǒng)版本
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-backports-ssl_match_hostname-3.5.0.1-1.el7.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-2.7.5-89.el7.x86_64.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-ipaddress-1.0.16-2.el7.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-chardet-2.2.1-3.el7.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-libs-2.7.5-89.el7.x86_64.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/rpm-python-4.11.3-45.el7.x86_64.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/yum-plugin-protectbase-1.1.31-54.el7_8.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/yum-3.4.3-168.el7.centos.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/libxml2-python-2.9.1-6.el7.5.x86_64.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-54.el7_8.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/yum-plugin-aliases-1.1.31-54.el7_8.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/lvm2-python-libs-2.02.187-6.el7.x86_64.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/yum-utils-1.1.31-54.el7_8.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-setuptools-0.9.8-7.el7.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-urlgrabber-3.10-10.el7.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-backports-1.0-8.el7.x86_64.rpm
wget https://vault.centos.org/7.9.2009/os/x86_64/Packages/python-kitchen-1.1.1-5.el7.noarch.rpm
5. 安裝
rpm -Uvh --replacepkgs lvm2-python-libs*.rpm --nodeps --force
rpm -Uvh --replacepkgs libxml2-python*.rpm --nodeps --force
rpm -Uvh --replacepkgs python*.rpm --nodeps --force
rpm -Uvh --replacepkgs rpm-python*.rpm yum*.rpm --nodeps --force
6. 檢查
yum --version
python --version