新安装了redhat6.5安装后，登录系统，使用yum update 更新系统。提示：
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
无法更新。
redhat 默认自带的 yum 源需要注册，才能更新。我们想不花钱也可以更新，需要替换掉redhat的yum源。
1.检查是否安装yum包
查看RHEL是否安装了yum，若是安装了，那么又有哪些yum包：
[root@localhost ~]# rpm -qa |grep yumyum-metadata-parser-1.0-8.fc6yum-3.0.1-5.el5yum-rhn-plugin-0.4.3-1.el5yum-updatesd-3.0.1-5.el
2 删除redhat自带的yum包
卸载上面显示的所有yum包：
[root@localhost ~]# rpm -qa|grep yum|xargs rpm -e --nodeps（不检查依赖，直接删除rpm包）
再用
[root@localhost ~]# rpm -qa |grep yum
[root@localhost ~]#
查看，无信息显示表示已经卸载完成。
3.下载新的yum包。使用Centos6.5的yum包
#wget/centos/6.5/os/i386/Packages/yum-metadata-parser-1.1.2-16.el6.i686.rpm
#wget/centos/6.5/os/i386/Packages/yum-3.2.29-40.el6.centos.noarch.rpm#wget/centos/6.5/os/i386/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm
安装yum软件包
注意:单个的安装包可能会依赖其它包（例如yum和yum-fastestmirror会相互依赖），所以我们可以把所有这些包放在一起，用一行命令将它们同时安装即可：
rpm -ivh yum-metadata-parser-1.1.2-16.el6.i686.rpm yum-3.2.29-40.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm
4.更换yum源。使用163的源
# cd /etc/yum.repos.d/# wget /.help/CentOS6-Base-163.repo# vi CentOS6-Base-163.repo
编辑文件，把文件里面的$releasever全部替换为版本号，即6.5（:1,$s/$releasever/6.5然后按enter建) 最后保存！或者直接把下面的内存拷贝到CentOS6-Base-163.repo文件中即可（已经修改好）
# CentOS-Base.repo## The mirror system uses the connecting IP address of the client and the# update status of each mirror to pick mirrors that are updated to and# geographically close to the client. You should use this for CentOS updates# unless you are manually picking other mirrors.## If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead.##[base]name=CentOS-6.5 - Base - baseurl=/centos/6.5/os/$basearch/#mirrorlist=/?release=6.5&arch=$basearch&repo=osgpgcheck=1gpgkey=/centos/RPM-GPG-KEY-CentOS-6#released updates [updates]name=CentOS-6.5 - Updates - baseurl=/centos/6.5/updates/$basearch/#mirrorlist=/?release=6.5&arch=$basearch&repo=updatesgpgcheck=1gpgkey=/centos/RPM-GPG-KEY-CentOS-6#additional packages that may be useful[extras]name=CentOS-6.5 - Extras - baseurl=/centos/6.5/extras/$basearch/#mirrorlist=/?release=6.5&arch=$basearch&repo=extrasgpgcheck=1gpgkey=/centos/RPM-GPG-KEY-CentOS-6#additional packages that extend functionality of existing packages[centosplus]name=CentOS-6.5 - Plus - baseurl=/centos/6.5/centosplus/$basearch/#mirrorlist=/?release=6.5&arch=$basearch&repo=centosplusgpgcheck=1enabled=0gpgkey=/centos/RPM-GPG-KEY-CentOS-6#contrib - packages by Centos Users[contrib]name=CentOS-6.5 - Contrib - baseurl=/centos/6.5/contrib/$basearch/#mirrorlist=/?release=6.5&arch=$basearch&repo=contribgpgcheck=1enabled=0gpgkey=/centos/RPM-GPG-KEY-CentOS-6
5.清除原有缓存
yum clean all
重建缓存，以提高搜索安装软件的速度
yum makecache
6.更新系统
# yum update
转自：http://qingwang./505009/1551228
