[系统运维]Centos7 python2.7误删重装

1、查看系统内核

cat /etc/redhat-release?

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2、彻底卸载python2

rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps #强制删除已安装程序及其关联

whereis python |xargs rm -frv #删除所有残余文件 ##xargs，允许你对输出执行其他某些命令?

3、卸载yum

由于yum会依赖python2，python2误删，导致yum不可用，不可用了就先删掉,以防依赖出错

#删除yum
rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps 
#删除残留文件
whereis yum |xargs rm -frv 
#验证删除完成,返回无结果
whereis yum 

4、创建目录python和yum用以存放rpm包

#mkdir /usr/local/python

#mkdir /usr/local/yum

?5、在官方网站下载对应的包

官方网站 http://vault.centos.org?

注意：由于没有找到内核版本为7.6.1810的包，所以就下个版本稍微低点的

1）下载python的rpm包：

#cd /usr/local/python       

#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-2.7.5-48.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-devel-2.7.5-48.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-libs-2.7.5-48.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/rpm-python-4.11.3-21.el7.x86_64.rpm

（2）下载yum的rpm包：

#cd /usr/local/yum        

#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-3.4.3-150.el7.centos.noarch.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
#wget http://vault.centos.org/7.3.1611/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-40.el7.noarch.rpm

6、安装python以及yum的rpm包?

（1）安装python:

#cd /usr/local/python 

#rpm -ivh python-* rpm-python-* --nodeps --force

（2）安装yum:

#cd /usr/local/yum 

#rpm -ivh yum-* 

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