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新安装的RHEL6.6，需要YUM安装时会出现以下问题：
#This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Setting up Install Process
Nothing to do
经过搜索，以下是结合网络相关资料整理成的一个解决方案。
系统：RedHat Enterprise Linux 6.6
rhel-server-6.6-i386-dvd.iso
这是下载地址： http://pan.baidu.com/s/1c0FOfNq
去掉提示注册的话，卸载几个软件包：
#rpm -qa | grep subscription-manager
然后移除那出现的几项吧：
#yum remove subscription-manager-gnome
#yum remove subscription-manager-firstboot
#yum remove subscription-manager
顺带在去除
# yum remove rhn-setup-gnome
这下就连管理里面都没有可以注册的选项了。
=================================================================
以下再更新yum源。
第一步下载相关安装包
可以通过http://mirrors.163.com/centos下载，这是笔者已经下载好的http://pan.baidu.com/s/1qW5WlgK
第二步卸载Redhat自带的yum
#rpm -qa | grep yum | xargs rpm -e --nodeps
第三步安装下载的安装包
#rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm
#rpm -ivh yum-metadata-parser-1.1.2-16.el6.i686.rpm
#rpm -ivh yum-3.2.29-69.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm
第四步，用以下wget命令到http://mirrors.163.com的 centos帮助文档中下载CentOS6-Base-163.repo文件，存放到/etc/yum.repos.d/目录中
#wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
第五步将Centos6-Base-163.repo中的$releasever改为Centos的版本号即可
为了防止错误，也可使用我已修改好的文件http://pan.baidu.com/s/1mg5ytug
在vi中打开Centos6-Base-163.repo，使用以下替换命令：
:1,$s/$releasever/6/gc
即可依次替换。
文件修改成如下即可：
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-6 - Base - 163.com
baseurl=http://mirrors.163.com/centos/6/os/$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
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
第六步 yum clean all 清除原有缓存
第七步 yum makecache 获取yum列表
等待，大约三分钟后出现下面提示，表示yum更改完成：
Metadata Cache Created
以上完成后说明更新成功。
RedHat Enterprise Linux 6.6 使用 Centos 6 的yum源问题
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原文地址：http://www.cnblogs.com/hopewait/p/4988594.html
