centos6 软件yum安装与卸载

当初想安装python2.7，直接干掉了系统默认的python2.6、和yum。后期想重新安装回来。花了好长时间才解决掉，网上的一些文章确实是坑，浪费了不少时间
直接卸载python和yum
rpm -qa | grep python | xargs rpm -e --nodepsrpm -qa | grep yum | xargs rpm -e --nodeps
安装python2.6 需要的包

 python-2.6.6-64.el6.x86_64.rpm
 python-iniparse-0.3.1-2.1.el6.noarch.rpm
 python-libs-2.6.6-64.el6.x86_64.rpm
 python-pycurl-7.19.0-9.el6.x86_64.rpm
 python-urlgrabber-3.9.1-11.el6.noarch.rpm 
 rpm -ivh .rpm

安装yum 所需软件包

yum-3.2.29-73.el6.centos.noarch.rpm
yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
 yum-plugin-fastestmirror-1.1.30-37.el6.noarch.rpm

rpm -ivh yum- 会包缺少依赖包 忽略掉rpm -ivh yum- --force --nodepsforce 强制安装nodeps 取消依赖安装
执行yum 命令

There was a problem importing one of the Python modulesrequired to run yum. 
The error leading to this problem was: No module named rpmPlease install a 
package which provides this module, orverify that the module is installed correctly.

rpm -qa | grep rpm查看是否缺少rpm-libs,*rpm-python俩个包。
下载安装即可解决问题
centos packages的下载地址，便于以后下载各种包使用
http://mirrors.163.com/centos/6/os/x86_64/Packages/