使用yum命令安装软件时候出现以下错误：
This system is not registered to Red Hat Subscription Management.You can use subscription-manager to register
...
查了以下说是使用redhat的yum源是需要注册付费的。
1. 卸载RedHat自带的yum包
#查看已安装的yum
rpm -qa|grep yum
#卸载已安装的yum
rpm -qa|grep yum|xargs rpm -e --nodeps
#再次查看已安装的yum
rpm -qa|grep yum
2. 使用国内新的centos的yum包替换redhat自带的
找到国内的镜像地址：http://mirrors.163.com/centos/
分别找到以下rpm的最新版本，截至我发帖时版本如下：
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-3.2.29-81.el6.centos.noarch.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-40.el6.noarch.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-urlgrabber-3.9.1-11.el6.noarch.rpm
wget http://mirrors.163.com/centos/6/os/x86_64/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm
安装如下几个包：
[root@rhel-server download]# rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm
[root@rhel-server download]# rpm -ivh python-urlgrabber-3.9.1-11.el6.noarch.rpm
[root@rhel-server download]# rpm -ivh python-urlgrabber-3.9.1-11.el6.noarch.rpm
#这2个rpm要一起装！！！
[root@rhel-server download]#rpm -ivh yum-3.2.29-81.el6.centos.noarch.rpm
yum-plugin-fastestmirror-1.1.30-40.el6.noarch.rpm
3. 备份Redhat自带的repo文件
[root@rhel-server etc]# cd /etc/yum.repos.d
[root@rhel-server yum.repos.d]# mv rhel-source.repo rhel-source.repo.bak
4. 下载163的repo文件
[root@rhel-server yum.repos.d]# wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
[root@rhel-server yum.repos.d]# ls
CentOS6-Base-163.repo rhel-source.repo.bak
替换文件中的$releasever为版本号6
[root@rhel-server yum.repos.d]# vim CentOS6-Base-163.repo
使用全文替换：
:1,$s/$releasever/6
运行以下命令生成缓存
yum clean all
yum makecache