一、查看redhat现有的yum
rpm -aq|grep yum
二、删除现有的yum
rpm -aq|grep yum|xargs rpm -e --nodeps
三、下载并安装rpm包
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-3.2.29-69.el6.centos.noarch.rpm wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm
rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm
rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
rpm -ivh yum-3.2.29-69.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm
四、更新repo文件
cd /etc/yum.repos.d/ wget http://mirrors.163.com/.help/CentOS6-Base-163.repo vi CentOS6-Base-163.repo
:g/$releasever/s//6.5/g
:%s/mirrors.163.com\/centos/vault.centos.org/ #网易的不可用了，换成vault.centos.org的
五、重建并更新
yum clean all yum makecache yum update
原文：http://www.cnblogs.com/codefamer/p/5032297.html