Quick upgrade of RedhatAS4 and AS5 to CentOS

Many servers in the Organization are RedHatAS4 and AS5 machines. You often need to install and compile software packages. upgrading to the CentOS system is much more convenient! I checked the relevant materials online, but they were not satisfactory. I finally found out the following methods and shared them with you! Check the current system version # less/etc/redhat-release and check whether Redhat's yum series package exists in the installed package # suroot # rpm-

Many servers in the Organization are RedHat AS4 and AS5 machines. You often need to install and compile software packages. upgrading to the CentOS system is much more convenient!

I checked the relevant materials online, but they were not satisfactory. I finally found out the following methods and shared them with you!

Check the current system version # less/etc/redhat-release check whether the Redhat yum series package exists in the installed package # su root # rpm-qa | grep if yum exists, delete it all one by one # rpm-e -- nodeps component package name to create a dedicated Centos directory, then download and install the yum series package of the Centos system # su webuser # cd/home/webuser # mkdir centos to download the Centos upgrade package (Note: perform operations based on RedHat AS4 or RedHat AS5) redHat AS4: # wget http://centos.ustc.edu.cn/centos/4.7/os/ I386/CentOS/RPMS/python-elementtree-1.2.6-5.el4.centos.i386.rpm # wget http://centos.ustc.edu.cn/centos/4.7/os/ I386/CentOS/RPMS/python-sqlite-1.1.7-1.2.1.i386.rpm # wget http://centos.ustc.edu.cn/centos/4.7/os/ I386/CentOS/RPMS/python-urlgrabber-2.9.8-2.noarch.rpm # wget http://centos.ustc.edu.cn/centos/4.7/os/ I386/CentOS/RPMS/sqlite-3.3.6-2.i386.rpm # wget http://centos.ustc.edu.cn/centos/4.7/os/ I386/CentOS/RPMS/yum-2.4.3-4.el4.centos.noarch.rpm # wget http://centos.ustc.edu.cn/centos/4.7/os/ I386/CentOS/RPMS/yum-metadata-parser-1.0-8.el4.centos.i386.rpm # wget http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4RedHat AS5: # wget http://centos.ustc.edu.cn/centos/5.3/os/ I386/CentOS/python-iniparse-0.2.3-4.el5.noarch.rpm # wget http://centos.ustc.edu.cn/centos/5.3/os/ I386/CentOS/yum-3.2.19-18.el5.centos.noarch.rpm # wget http://centos.ustc.edu.cn/centos/5.3/os/ I386/CentOS/yum-fastestmirror-1.1.16-13.el5.centos.noarch.rpm # wget http://centos.ustc.edu.cn/centos/5.3/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 Install the Centos upgrade package # su root # rpm-Uvh -- nodeps/home/webuser/centos /*. rpm import Centos Upgrade Component authorization (Note: According to RedHat AS4 or RedHat AS5 respectively) RedHat AS4: # rpm -- import/home/webuser/centos/RPM-GPG-KEY-CentOS-4RedHat AS5: # rpm -- import/home/webuser/centos/RPM-GPG-KEY-CentOS-5 create and edit the yum upgrade source configuration file # su root # mkdir-p/etc/yum. repos. d/# vi/etc/yum. repos. d/CentOS-Base.repo paste the following content to overwrite the file: RedHat AS4: [base] name = CentOS-$ releasever-Basebaseurl = http://centos.ustc.edu.cn/centos/4.7/os/ $ Basearch/gpgcheck = 1 gpgkey = http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4#released Updates [update] name = CentOS-$ releasever-Updatesbaseurl = http://centos.ustc.edu.cn/centos/4.7/updates/ $ Basearch/gpgcheck = 1 gpgkey = http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4#packages Used/produced in the build but not released [addons] name = CentOS-$ releasever-Addonsbaseurl = http://centos.ustc.edu.cn/centos/4.7/addons/ $ Basearch/gpgcheck = 1 gpgkey = http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4#additional Packages that may be useful [extras] name = CentOS-$ releasever-Extrasbaseurl = http://centos.ustc.edu.cn/centos/4.7/extras/ $ Basearch/gpgcheck = 1 gpgkey = http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4#additional Packages that extend functionality of existing packages [centosplus] name = CentOS-$ releasever-Plusbaseurl = http://centos.ustc.edu.cn/centos/4.7/centosplus/ $ Basearch/gpgcheck = 1 enabled = 0 gpgkey = http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4#contrib -Packages by Centos Users [contrib] name = CentOS-$ releasever-Contribbaseurl = http://centos.ustc.edu.cn/centos/4.7/contrib/ $ Basearch/gpgcheck = 1 enabled = 0 gpgkey = http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-4RedHat AS5: [base] name = CentOS-$ releasever-Basebaseurl = http://centos.ustc.edu.cn/centos/5.3/os/ $ Basearch/gpgcheck = 1 gpgkey = http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5 # Released updates [update] name = CentOS-$ releasever-Updatesbaseurl = http://centos.ustc.edu.cn/centos/5.3/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-Addonsbaseurl = http://centos.ustc.edu.cn/centos/5.3/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-Extrasbaseurl = http://centos.ustc.edu.cn/centos/5.3/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-Plusbaseurl = http://centos.ustc.edu.cn/centos/5.3/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-Contribbaseurl = http://centos.ustc.edu.cn/centos/5.3/contrib/ $ Basearch/gpgcheck = 1 enabled = 0 gpgkey = http://centos.ustc.edu.cn/centos/RPM-GPG-KEY-CentOS-5 After checking, save and exit to start upgrading the system # yum update waits for the system to list the components to be upgraded and press "y" to confirm Total download size: 334 MIs this OK [y/n]: y... Complete! After downloading all components, restart the server and upgrade the operating system!