Last year at work we brought a little server … you know, fiberchannel hard disks, 32GB of RAM, four quad core XEON … usual stuff ;-)
We also got a 1 year of Red Hat Enterprise Linux subscription. Obviuosly this year the money for a renewal of it’s licence aren’t available so, to keep safe and up-2-date, what do we do?
We’ve decided to migrate to CentOS, given their famous binary compatibility with the Prominent North American Enterprise Linux Vendor ;-) Thanks to the Lord the process was simple and straightfoward as shown on the page of the official CentOS’ wiki.
Even with the subscription to RHN out-of-date, I did manage to upgrade r5.4 to 5.5 … the process cleaned ALL the official RedHat’s repo files from /etc/yum.repos.d … so beware, make a backup copy of them.
Then I’ve disabled the (few) 3rd party repo sources from my system (they are currently just adobe, epel and remi).
At this point I’ve followed the advice to disable first, and remove later, the yum’s rhnplugin since some CentOS’s forum user issued some warning or error if that was not done. Hence the following commands sequence was given (as root):
cp /etc/redhat-release /etc/redhat-release-saved
rpm -e --nodeps redhat-release-notes redhat-release yum-rhn-plugin redhat-logos
We’ve nearly there … I’ve manually downloaded on the system the three packages: centos-release, centos-release-notes and redhat-logos-X.X.XX-XX.el5.centos.noarch.rpm from the nearest (and fastest) distribution mirror available (they are placed in the ../5/os/$YOUR-ARCH/CentOS/ directory, by the way) and then manually installed with plain old rpm.
completed the process and here we are:
[root@localhost ~]# cat /etc/issue
CentOS release 5.5 (Final)
[root@localhost ~]# uname -a
Linux localhost 2.6.18-194.3.1.el5 #1 SMP Sun May 2 04:17:42 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux