昨天安裝第五步的時候：開始是沒有網，，，居然ping不通 網 ，服務器也ping不通,,,,,可能和我前幾天刪除了網絡適配器有關，，把linux橋接對應的適配器給刪了，，，
解決辦法是打開虛擬網絡編輯器 ，以管理員身份運行 刪除vmnet0 再添加vmnet0 ,設置橋接方式，正常情況都會解決，，若還不行，，果斷卸載VM，重裝，，，避免時間浪費，
一切設置好后，再來不簽名的安裝glibc的調試包，，，結果報錯！！
yum --nogpgcheck --enablerepo=debug install glibc-debuginfo
Loaded plugins: product-id, refresh-packagekit, security, subscription-manager
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
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經過研究發現，其實如果使用redhat的yum源需注冊付費，費時費力，
解決辦法一（未驗證）刪除RHEL 6.7 的RHN注冊和訂閱提示
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subscription-manager-1.14.10-1.el6.x86_64
subscription-manager-migration-1.14.10-1.el6.x86_64
subscription-manager-migration-data-2.0.22-1.el6.noarch
subscription-manager-firstboot-1.14.10-1.el6.x86_64
rhn-check-1.0.0.1-32.el6.noarch
rhn-setup-gnome-1.0.0.1-32.el6.noarch
rhn-setup-1.0.0.1-32.el6.noarch
rhn-client-tools-1.0.0.1-32.el6.noarch
rhnlib-2.5.22-15.el6.noarch
yum-rhn-plugin-0.9.1-58.el6.noarch
正在刪除 : subscription-manager-migration-1.14.10-1.el6.x86_64 2/4
正在刪除 : subscription-manager-gui-1.14.10-1.el6.x86_64 3/4
正在刪除 : subscription-manager-1.14.10-1.el6.x86_64 4/4
正在刪除 : rhn-check-1.0.0.1-32.el6.noarch 2/5
正在刪除 : yum-rhn-plugin-0.9.1-58.el6.noarch 3/5
正在刪除 : rhn-setup-1.0.0.1-32.el6.noarch 4/5
正在刪除 : rhnsd-4.9.3-2.el6.x86_64 5/5
這里不用rpm -e來刪除程序是因為在執行刪除任務的過程中會出現由於程序的相互依賴關系而無法刪除的錯誤。
第一步下載相關安裝包
可以通過http://mirrors.163.com/centos下載，
第二步卸載Redhat自帶的yum
#rpm -qa | grep yum | xargs rpm -e --nodeps
第三步安裝下載的安裝包
#rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm
#rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm
#rpm -ivh yum-3.2.29-40.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm
第四步到http://mirrors.163.com的 centos幫助文檔
中下載CentOS6-Base-163.repo文件，存放到/etc/yum.repos.d中
#wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
第五步將Centos6-Base-163.repo中的$releasever改為Centos的版本號即可
為了防止錯誤，也可使用我已修改好的文件http://pan.baidu.com/s/1o6AZ23o
文件修改成如下即可：
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-6 - Base - 163.com
baseurl=http://mirrors.163.com/centos/6/os/$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 清除原有緩存
第七步 yum makecache 獲取yum列表
等待，大約三分鍾后出現下面提示，表示yum更改完成：
Metadata Cache Created
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其實也不用這么麻煩，
1.卸載redhat自帶的yum組件 rpm -qa|grep yum|xargs rpm -e --nodeps