redhat yum替换成CentOS yum 并修改源

wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.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-3.2.29-60.el6.centos.noarch.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm

rpm -qa | grep yum | xargs rpm -e --nodeps

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-3.2.29-60.el6.centos.noarch.rpm  yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm 

cd /etc/yum.repos.d
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
编辑CentOS6-Base-163.repo文件，将其中的$releasever更改为centos的版本号,注意6.x版本，都使用6

yum clean all 清除缓存
yum makecache 生成缓存

禁用　镜像检测插件，因为有时太慢。

yum --disableplugin=fastestmirror update