migrate from rhel5.x to centos 5.9

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upgrade your rhel 5.3 to centos 5.9 how to . case study.

cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.3 (Tikanga)
# uname -a
Linux vijayrhel.mydomain.com 2.6.18-274.12.1.el5 #1 SMP Tue Nov 8 21:37:35 EST 2011 x86_64 x86_64 x86_64 GNU/Linux

# cd /usr/src
# wget http://mirror.centos.org/centos/5/os/x86_64/CentOS/yum-3.2.22-40.el5.centos.noarch.rpm
# wget http://mirror.centos.org/centos/5/os/x86_64/CentOS/centos-release-5-9.el5.centos.1.x86_64.rpm
# wget http://mirror.centos.org/centos/5/os/x86_64/CentOS/centos-release-5-9.el5.centos.x86_64.rpm
# wget http://mirror.centos.org/centos/5/os/x86_64/CentOS/centos-release-notes-5.9-0.x86_64.rpm
# cp /etc/redhat-release /etc/redhat-release.redhat
# yum -y remove rhn*
# rpm --import http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
# rpm -Uhv yum-3.2.22-39.el5.centos.noarch.rpm yum-fastestmirror-1.1.16-21.el5.centos.noarch.rpm
# rpm -ev --nodeps redhat-release
# rpm -ihv centos-release-5-8.el5.centos.x86_64.rpm centos-release-notes-5.8-0.x86_64.rpm
# yum update
# vim /etc/grub.conf
change default kernel to new one
# reboot

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