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：

[root@localhost Desktop]# 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：

[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Centos6.6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/
# wget  http://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.
#
#
[base]
name=CentOS-6.6 - Base - 163.com
baseurl=http: //mirrors .163.com /centos/6 .6 /os/ $basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$basearch&repo=os
gpgcheck=1
gpgkey=http: //mirror .centos.org /centos/RPM-GPG-KEY-CentOS-6

#released updates
[updates]
name=CentOS-6.5 - Updates - 163.com
baseurl=http: //mirrors .163.com /centos/6 .6 /updates/ $basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$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-6.5 - Extras - 163.com
baseurl=http: //mirrors .163.com /centos/6 .6 /extras/ $basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$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-6.5 - Plus - 163.com
baseurl=http: //mirrors .163.com /centos/6 .6 /centosplus/ $basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$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-6.5 - Contrib - 163.com
baseurl=http: //mirrors .163.com /centos/6 .6 /contrib/ $basearch/
#mirrorlist=http://mirrorlist.centos.org/?release=6.6&arch=$basearch&repo=contrib
gpgcheck=1
enabled=0
gpgkey=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