On 10-03-17 2:44 PM, Troy Dawson wrote:
> Hi,
> This question comes up every year or two.  We haven't made it into a web
> page because we don't want to make it look like we are trying to take
> away RedHat's business.
>
> Updating from RHEL5 to SL5 is easier than it is to update from RHEL4 to
> SL4.  This is because RHEL5 has yum, while RHEL4 is using up2date.
>
> I *believe* the easiest way would be to change up2date to point to
> scientific linux, and then use it to install yum and the first updates.
>
> 1 - Edit /etc/sysconfig/rhn/sources and comment out the line
>     up2date default
> and add the lines
>     yum fermi-base
> http://ftp1.scientificlinux.org/linux/scientific/4x/$ARCH/SL/RPMS/
>     yum fermi-errata
> http://ftp1.scientificlinux.org/linux/scientific/4x/$ARCH/errata/SL/RPMS/
>
> 2 - Install yum using up2date
>     up2date install yum
>     up2date install yum-conf
>
> 3 - install sl-release using yum
>     yum install sl-release
>
> 4 - Update everything else
>     yum update
>
> You may run into problems with this, but I currently don't have the
> infrastructure to test this out, so I am not sure what problems you will
> run into.  But that is the general idea.  Get yum on the system, then
> update sl-release, and then update everything else.
>
> Troy

For the most part, the above instructions worked perfectly - save for 
up2date complaining about GPG signatures. I added --nosig and it worked 
great (livin on the edge!).. How would I have installed the gpg signature?

Also, do you mind if I publish these instructions on the web? (I can 
give credit, or not - depending upon what you prefer).. I know you don't 
want it to look like you're trying to cannabalize RHEL but this helps 
smaller vendors or university groups who don't have the resources for a 
full RHEL support license.

Also, thank you kindly for all the work you do on SL!

Thanks,
~Chris