Convert RHEL 6.X To CentOS 6.X

Converting RHEL 6.x to CentOS 6.x

Clean up existing cache of metadata and packages. Also, erase RedHat subscription manager.

# yum clean all
# rpm -e subscription-manager

Create a directory to keep CentOS packages

# mkdir /root/centos
# cd /root/centos

Download the packages

# wget http://mirror.centos.org/centos/6.3/os/x86_64/RPM-GPG-KEY-CentOS-6
# wget http://mirror.centos.org/centos/6.3/os/x86_64/Packages/centos-release-6-3.el6.centos.9.x86_64.rpm
# wget http://mirror.centos.org/centos/6.3/os/x86_64/Packages/yum-3.2.29-30.el6.centos.noarch.rpm
# wget http://mirror.centos.org/centos/6.3/os/x86_64/Packages/yum-utils-1.1.30-14.el6.noarch.rpm
# wget http://mirror.centos.org/centos/6.3/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm

Next enter the commands below to first import CentOS GPG key, to install the packages and then to upgrade to CentOS 6

# rpm –import RPM-GPG-KEY-CentOS-6
# rpm -e –nodeps redhat-release-server
# rpm -e yum-rhn-plugin rhn-setup rhn-check rhn-setup-gnome rhnsd
# rpm -Uhv –force *.rpm
# yum upgrade

Reboot the server in order to complete the installation.

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