使用redhat的yum源是需要注册付费的
解决方法
1.卸载redhat 自带yum
#rpm -qa|grep yum|xargs rpm -e --nodeps
2.下载Centos yum安装包
1.查看系统是i686 还是x86
#cat /etc/issue && arch
2.下载如下四个rpm包
注：可以使用yumdownloader xxx 的方法从Centos系统上下载rpm包
yumdownloader 命令需要执行命令 yum install utils -y
如系统是x86 可
下载 我的软件包
密码：a0yz
3.安装yum后，配置网络源
4.#vim /etc/yum.repo.d/Centos.repo
配置如下
[base]
name=CentOS-6 - Base - 163.com
baseurl=http://mirrors.163.com/centos/6/os/$basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=os
#gpgcheck=1
#gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#
#
##released updates
#[updates]
#name=CentOS-6 - Updates - 163.com
#baseurl=http://mirrors.163.com/centos/6/updates/$basearch/
##mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=updates
#gpgcheck=1
#gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#
#
##additional packages that may be useful
#[extras]
#name=CentOS-6 - Extras - 163.com
#baseurl=http://mirrors.163.com/centos/6/extras/$basearch/
##mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=extras
#gpgcheck=1
#gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#
#
##additional packages that extend functionality of existing packages
#[centosplus]
#name=CentOS-6 - Plus - 163.com
#baseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/
##mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=centosplus
#gpgcheck=1
#enabled=0
#gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#
#
##contrib - packages by Centos Users
#[contrib]
#name=CentOS-6 - Contrib - 163.com
#baseurl=http://mirrors.163.com/centos/6/contrib/$basearch/
##mirrorlist=http://mirrorlist.centos.org/?release=6&arch=$basearch&repo=contrib
#gpgcheck=1
#enabled=0
5. 保存repo文件
6.#yum clean all
7.执行缓存
yum makecache
可以正常使用yum 了
注：遇到 NO KEY
--nogpgcheck 跳过公钥检查