redhat6.4 配置使用centos的yum源
新安装了redhat6.4.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：
# rpm -qa |grep yum
PackageKit-yum-0.5.8-21.el6.x86_64
yum-3.2.29-40.el6.noarch
yum-plugin-security-1.1.30-14.el6.noarch
PackageKit-yum-plugin-0.5.8-21.el6.x86_64
yum-rhn-plugin-0.9.1-43.el6.noarch
yum-utils-1.1.30-14.el6.noarch
yum-metadata-parser-1.1.2-16.el6.x86_64
2 删除redhat自带的yum包
卸载上面显示的所有yum包：
# rpm -qa|grep yum|xargs rpm -e --nodeps（不检查依赖，直接删除rpm包）
再用
# rpm -qa |grep yum
#
查看，无信息显示表示已经卸载完成。
3.下载新的yum包。使用Centos6.6的yum包
# wget http://mirrors.163.com/centos/6.6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm# wget http://mirrors.163.com/centos/6.6/os/x86_64/Packages/yum-3.2.29-60.el6.centos.noarch.rpm# wget http://mirrors.163.com/centos/6.6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm 4.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.x86_64.rpm yum-3.2.29-60.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm
5.更换yum源。使用163的源
# cd /etc/yum.repos.d/# wgethttp://mirrors.163.com/.help/CentOS6-Base-163.repo# vi CentOS6-Base-163.repo 编辑文件，把文件里面的$releasever全部替换为版本号，即6.6 最后保存！或者直接把下面的内存拷贝到CentOS6-Base-163.repo文件中即可
# CentOS-Base.repo## The mirror system uses the connecting IP address of the client and the# update status of each mirror to pick mirrors that are updated to and# geographically close to the client.You should use this for CentOS updates# unless you are manually picking other mirrors.## If the mirrorlist= does not work for you, as a fall back you can try the # remarked out baseurl= line instead.##name=CentOS-6.6 - Base - 163.combaseurl=http://mirrors.163.com/centos/6.6/os/$basearch/#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$basearch&repo=osgpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 #released updates name=CentOS-6.5 - Updates - 163.combaseurl=http://mirrors.163.com/centos/6.6/updates/$basearch/#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$basearch&repo=updatesgpgcheck=1gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 #additional packages that may be usefulname=CentOS-6.5 - Extras - 163.combaseurl=http://mirrors.163.com/centos/6.6/extras/$basearch/#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$basearch&repo=extrasgpgcheck=1 gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#additional packages that extend functionality of existing packagesname=CentOS-6.5 - Plus - 163.combaseurl=http://mirrors.163.com/centos/6.6/centosplus/$basearch/#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$basearch&repo=centosplusgpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 #contrib - packages by Centos Usersname=CentOS-6.5 - Contrib - 163.combaseurl=http://mirrors.163.com/centos/6.6/contrib/$basearch/#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$basearch&repo=contribgpgcheck=1enabled=0gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6 6.清除原有缓存
# yum clean all
7.重建缓存，以提高搜索安装软件的速度
# yum makecache
8.更新系统
# yum update
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