實驗步驟
1、檢查系統是否安裝了yum
[root@node2 ~]# rpm -qa |grep yum
PackageKit-yum-plugin-0.5.8-23.el6.x86_64
yum-metadata-parser-1.1.2-16.el6.x86_64
yum-utils-1.1.30-30.el6.noarch
yum-3.2.29-60.el6.noarch
yum-plugin-security-1.1.30-30.el6.noarch
PackageKit-yum-0.5.8-23.el6.x86_64
yum-rhn-plugin-0.9.1-50.el6.noarch
2、刪除已安裝的yum軟件包
[root@node2 ~]# rpm -qa |grep yum |xargs rpm -e --nodeps /直接刪除yum包，不檢查依賴關係
[root@node2 ~]# rpm -qa |grep yum
[root@node2 ~]#
3、下載新的RHEL6.6yum包
注：這裏我下載的是CentOS6.6yum包,原因是mirrors.163.com鏡像站點中沒有RHEL，而CentOS6.6和它架構一樣，所以沒有什麼影響，不必擔心。
需要下載的yum包：
yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm
yum-3.2.29-60.el6.centos.noarch.rpm
yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
[root@node2 ~]# wget http://mirrors.163.com/centos/6.6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm /其餘軟件下載方式同樣
也可直接通過網站下載：
下載地址：http://mirrors.163.com/centos/6.6/os/x86_64/Packages
還可以通過本文中的附件進行下載
4、安裝yum軟件包
[root@node2 rpm]# rpm -ivh yum-3.2.29-60.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm yum-metadata-parser-1.1.2-16.el6.x86_64.rpm /這樣安裝可以解決yum包依賴關係
warning: yum-3.2.29-60.el6.centos.noarch.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEY
Preparing... ########################################### [100%]
1:yum-metadata-parser ########################################### [ 33%]
2:yum-plugin-fastestmirro########################################### [ 67%]
3:yum ########################################### [100%]
[root@node2 rpm]#
5、更新yum源
[root@node2 rpm]# cd /etc/yum.repos.d/
[root@node2 yum.repos.d]# ls
packagekit-media.repo rhel-source.repo
[root@node2 yum.repos.d]# rm -rf ./* /刪除“yum.repos.d”目錄中舊有的“.repo”文件
[root@node2 yum.repos.d]# vim Base.repo /新建Base.repo文件，並輸入以下內容
[base]
name=redhat-6.6-Base-163.com
baseurl=http://mirrors.163.com/centos/6/os/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
#名稱最好做到見名知意，對後續不會有影響
#下載軟件的鏈接地址
#是否啓用gpg檢查，1是開啓，0是關閉
#開啓gpgcheck後，通過gpgkey來指定相應的gpg文件，如果不指定gpgkey文件，那麼就必須手動的導入相應的gpg文件。
[updates]
name=redhat-6.6-updates-163.com
baseurl=http://mirrors.163.com/centos/6/updates/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
[extras]
name=redhat-6.6-Extras-163.com
baseurl=http://mirrors.163.com/centos/6/extras/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
[centosplus]
name=redhat-6.6-Plus-163.com
baseurl=http://mirrors.163.com/centos/6/centosplus/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
[contrib]
name=redhat-6.6-contrib-163.com
baseurl=http://mirrors.163.com/centos/6/contrib/$basearch/
gpgcheck=1
gpgkey=http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
6、清除原有緩存
[root@node2 yum.repos.d]# yum clean all
Loaded plugins: fastestmirror, product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Cleaning repos: base extras updates
Cleaning up Everything
7、重建緩存，以提高搜索、安裝軟件的速度
[root@node2 yum.repos.d]# yum makecache
Loaded plugins: fastestmirror, product-id, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
Determining fastest mirrors
base | 3.7 kB 00:00
base/group_gz | 216 kB 00:00
base/filelists_db | 6.1 MB 00:26
base/primary_db | 4.6 MB 00:19
base/other_db | 2.8 MB 00:12
.............................................
Metadata Cache Created
8、更新系統
[root@node2 yum.repos.d]# yum update /更新時間可能過慢，視具體情況而定。也可以只更新某些需要的軟件，跟上文件名即可
補充:epel-release的搭建
[root@localhost ~]#wget http://mirrors.hust.edu.cn/epel//6/x86_64/epel-release-6-8.noarch.rpm
[root@localhost ~]#rpm -ivh epel-release-6-8.noarch.rpm
[root@localhost ~]#yum install epel-release
至此，本文檔已經結束，文檔中難免有不盡人意之處，希望各位能夠給出寶貴的建議，謝謝！
紫禁之巔
2015年8月5日 13：36