由于redhet自带的yum需要收费，所以卸载原先的自带yum工具，linux版本为centos6.3

查看已安装的yum包

rpm -qa|grep yum

卸载软件包

rpm -e --nodeps yum-*

下载地址

http://mirrors.163.com/centos/6/os/x86_64/Packages/

下载：

wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-3.2.29-81.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-1.1.30-40.el6.noarch.rpm

安装yum包

rpm -ivh yum-*

如果返现python错误如下：

Python-urlgrabber >= 3.9.1-10 is needed by yum-3.2.29-73.el6.centos.noarch

发现错误，python-urlgrabber版本必须大于等于3.9.1-10

查看系统的python信息

rpm -qa|grep python

发现python-urlgrabber-3.9.1-9.el6.noarch 版本低于3.9.1-10

卸载：python-urlgrabber-3.9.1-9.el6.noarch

rpm -e python-urlgrabber-3.9.1-9.el6.noarch

下载

wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-urlgrabber-3.9.1-11.el6.noarch.rpm

安装python-urlgrabber

rpm -ivh python-urlgrabber-3.9.1-11.el6.noarch.rpm

再次安装yum

rpm -ivh --force yum-*

更新yum源(针对centos6的系统)

cd /etc/yum.repos.d

wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

sed -i 's#$releasever#6#g' ./CentOS6-Base-163.repo

yum clean all

yum makecache