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中電雲集
快速Redhat AS4和AS5升級至Centos係統
單位很多服務器都是Redhat AS4和AS5的機器，平時經常需要安裝和編譯軟件包，升級到Centos係統能夠方便不少!
網上查閱了相關資料，但是都不盡如人意，最終自己摸索出以下方法，和大家一起分享!
查看當前係統版本號
# less /etc/redhat-release
檢查係統已安裝的組件包中是否已存在Redhat的自帶的yum係列組件包
# su root
# rpm -qa | grep yum
如果存在請逐一全部刪除
# rpm -e –nodeps 組件包名稱
建立Centos專用目錄，然後下載並安裝Centos係統的yum係列組件包
# su webuser
# cd /home/webuser
# mkdir centos
下載Centos升級組件包（注：根據RedHat AS4或RedHat AS5分別操作）
RedHat AS4：
# wget https://centos.ustc.edu.cn/centos/4.7/os/i386/CentOS/RPMS/python-elementtree-1.2.6-5.el4.centos.i386.rpm
# wget https://centos.ustc.edu.cn/centos/4.7/os/i386/CentOS/RPMS/python-sqlite-1.1.7-1.2.1.i386.rpm
# wget https://centos.ustc.edu.cn/centos/4.7/os/i386/CentOS/RPMS/python-urlgrabber-2.9.8-2.noarch.rpm
# wget https://centos.ustc.edu.cn/centos/4.7/os/i386/CentOS/RPMS/sqlite-3.3.6-2.i386.rpm
# wget https://centos.ustc.edu.cn/centos/4.7/os/i386/CentOS/RPMS/yum-2.4.3-4.el4.centos.noarch.rpm
# wget https://centos.ustc.edu.cn/centos/4.7/os/i386/CentOS/RPMS/yum-metadata-parser-1.0-8.el4.centos.i386.rpm
# wget https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4
RedHat AS5：
# wget https://centos.ustc.edu.cn/centos/5.3/os/i386/CentOS/python-iniparse-0.2.3-4.el5.noarch.rpm
# wget https://centos.ustc.edu.cn/centos/5.3/os/i386/CentOS/yum-3.2.19-18.el5.centos.noarch.rpm
# wget https://centos.ustc.edu.cn/centos/5.3/os/i386/CentOS/yum-fastestmirror-1.1.16-13.el5.centos.noarch.rpm
# wget https://centos.ustc.edu.cn/centos/5.3/os/i386/CentOS/yum-metadata-parser-1.1.2-2.el5.i386.rpm
# wget https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
安裝Centos升級組件包
# su root
# rpm -Uvh –nodeps /home/webuser/centos/*.rpm
導入Centos升級組件授權（注：根據RedHat AS4或RedHat AS5分別操作）
RedHat AS4：
# rpm –import /home/webuser/centos/RPM-GPG-KEY-CentOS-4
RedHat AS5：
# rpm –import /home/webuser/centos/RPM-GPG-KEY-CentOS-5
創建並編輯yum升級源配置文件
# su root
# mkdir -p /etc/yum.repos.d/
# vi /etc/yum.repos.d/CentOS-Base.repo
粘貼以下內容覆蓋文件：
RedHat AS4：
[base]
name=CentOS-$releasever - Base
baseurl=https://centos.ustc.edu.cn/centos/4.7/os/$basearch/
gpgcheck=1
gpgkey= https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4
#released updates
[update]
name=CentOS-$releasever - Updates
baseurl=https://centos.ustc.edu.cn/centos/4.7/updates/$basearch/
gpgcheck=1
gpgkey= https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4
#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
baseurl=https://centos.ustc.edu.cn/centos/4.7/addons/$basearch/
gpgcheck=1
gpgkey= https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=https://centos.ustc.edu.cn/centos/4.7/extras/$basearch/
gpgcheck=1
gpgkey= https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://centos.ustc.edu.cn/centos/4.7/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey= https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
baseurl=https://centos.ustc.edu.cn/centos/4.7/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey= https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4
RedHat AS5：
[base]
name=CentOS-$releasever - Base
baseurl=https://centos.ustc.edu.cn/centos/5.3/os/$basearch/
gpgcheck=1
gpgkey=https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#released updates
[update]
name=CentOS-$releasever - Updates
baseurl=https://centos.ustc.edu.cn/centos/5.3/updates/$basearch/
gpgcheck=1
gpgkey=https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
baseurl=https://centos.ustc.edu.cn/centos/5.3/addons/$basearch/
gpgcheck=1
gpgkey=https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=https://centos.ustc.edu.cn/centos/5.3/extras/$basearch/
gpgcheck=1
gpgkey=https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=https://centos.ustc.edu.cn/centos/5.3/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
baseurl=https://centos.ustc.edu.cn/centos/5.3/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
核對後保存並退出
開始升級係統
# yum update
等待係統列出需要升級的組件清單並按”y”確認
Total download size: 334 M
Is this ok [y/n]: y
…
Complete!
等待全部組件下載完成後，重新啟動服務器，操作係統升級完畢！
最後更新：2017-01-04 22:34:31