redhat使用centosYUM源
1、删除rhel自带的yum源rpm -aq | grep yum|xargs rpm -e --nodeps
2、下载新的yum安装包
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-3.2.29-69.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
3、安装yum包，注意的是标红的必须一起装，有依赖关系
rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm yum-3.2.29-69.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm
4、更改成163的yum源
cd /etc/yum.repos.d/
wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
ls
CentOS6-Base-163.repo
把文件里面的$releasever全部替换为版本号，即6
sed -i 's#$releasever#6#g' CentOS6-Base-163.repo
5、清除yum缓存
yum clean all
yum makecache
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