【转】快速Redhat AS4和AS5升级至Centos系统

Redhat AS4和AS5的机器，升级和安装rpm包，需要License，平时经常需要安装和编译软件包，升级到Centos系统能够方便不少!

查看当前系统版本号

# less /etc/redhat-release

 

检查系统已安装的组件包中是否已存在Redhat的自带的yum系列组件包

# su root

# rpm -qa | grep yum

 

如果存在请逐一全部删除

# rpm -e --nodeps 组件包名称

 

建立Centos专用目录，然后下载并安装Centos系统的yum系列组件包

 

下载Centos升级组件包（注：根据RedHat AS5操作）

 

RedHat AS5：

 

# wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/python-iniparse-0.2.3-4.el5.noarch.rpm

# wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-3.2.19-18.el5.centos.noarch.rpm

# wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-fastestmirror-1.1.16-13.el5.centos.noarch.rpm

# wget http://centos.ustc.edu.cn/centos/5/os/i386/CentOS/yum-metadata-parser-1.1.2-2.el5.i386.rpm

# wget http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

 

注意，如果是x64的，需要把上面URL中的i386改为x86_64

安装Centos升级组件包

# su root

# rpm -Uvh --nodeps *.rpm

 

导入Centos升级组件授权（注：根据RedHat AS5操作）

RedHat AS5：

# rpm --import .../RPM-GPG-KEY-CentOS-5   (...表示文件所在路径)

 

创建并编辑yum升级源配置文件

# su root

# mkdir -p /etc/yum.repos.d/

# vi /etc/yum.repos.d/CentOS-Base.repo

粘贴以下内容覆盖文件：

RedHat AS5：
 
[base]
name=CentOS-$releasever - Base
baseurl=http://centos.ustc.edu.cn/centos/5/os/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
 
#released updates
[update]
name=CentOS-$releasever - Updates
baseurl=http://centos.ustc.edu.cn/centos/5/updates/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
 
#packages used/produced in the build but not released
[addons]
name=CentOS-$releasever - Addons
baseurl=http://centos.ustc.edu.cn/centos/5/addons/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
 
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras
baseurl=http://centos.ustc.edu.cn/centos/5/extras/$basearch/
gpgcheck=1
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
 
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus
baseurl=http://centos.ustc.edu.cn/centos/5/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5
 
#contrib - packages by Centos Users
[contrib]
name=CentOS-$releasever - Contrib
baseurl=http://centos.ustc.edu.cn/centos/5/contrib/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5

 
核对后保存并退出
 
开始升级系统
# yum update
等待系统列出需要升级的组件清单并按”y”确认
Total download size: 334 M
Is this ok [y/n]: y
…
Complete!
等待全部组件下载完成后，重新启动服务器，操作系统升级完毕！

【转自】http://blog.csdn.net/xiaolong85/article/details/5658040