安装yum： rpm >= 0:4.11.3-22 被 yum-3.4.3-154.el7.centos.noarch

安装yum：

最近在centos7上安装了python3致使yum不能用，被其余人卸载掉后从新安装

#下载yum安装包
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-3.2.27-14.el6.centos.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-3.4.3-158.el7.centos.noarch.rpm
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm

#安装 
rpm -ivh  python-iniparse-0.4-9.el7.noarch.
rpm -ivh  yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
rpm -ivh  yum-3.4.3-158.el7.centos.noarch.rpm  #会出现问题1
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-4.11.3-32.el7.x86_64.rpm
rpm -Uvh rpm-4.11.3-32.el7.x86_64.rpm --nodeps
rpm -ivh  yum-3.4.3-158.el7.centos.noarch.rpm yum-plugin-fastestmirror-1.1.31-45.el7.noarch.rpm

错误：依赖检测失败：    
    rpm >= 0:4.11.3-22 被 yum-3.4.3-154.el7.centos.noarch 须要
    yum >= 3.0 被 yum-plugin-fastestmirror-1.1.31-45.el7.noarch 须要 
解决： 
wget http://mirrors.163.com/centos/7/os/x86_64/Packages/rpm-4.11.3-32.el7.x86_64.rpm
rpm -Uvh rpm-4.11.3-32.el7.x86_64.rpm --nodeps

成功！
注意：升级成了python3也能够用python2,
由于yum使用python2，所以替换为python3后可能没法正常工做，继续使用这个python2.7. 所以修改yum配置文件

sudo vim /usr/bin/yum

把文件头部的#!/usr/bin/python改为#!/usr/bin/python2.7保存退出便可.

/usr/libexec/urlgrabber-ext-down看看，发下他也使用了/usr/bin/python，因而跟前面同样，改成2.7，完成。
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