Re: Patching Red-Hat to a specific version.

On Fri, Dec 9, 2011 at 8:30 AM, Mertens, Bram <mertensb@xxxxxxxxxxxx> wrote:



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-----Original Message-----
From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-
bounces@xxxxxxxxxx] On Behalf Of Matty Sarro
Sent: donderdag 8 december 2011 17:31
To: General Red Hat Linux discussion list
Subject: Re: Patching Red-Hat to a specific version.

On Thu, Dec 8, 2011 at 11:18 AM, cliff here <c4ifford@xxxxxxxxx> wrote:
Hey guys and gals,

This might be a simple question but it's in a scenario that I haven't
had
to deal with with before. I'm about to enter testing process where all
of
my (four) redhat boxes need to be the same version. Well right now I
have
three 5.6 hosts and one 5.7 host; now I know those point releases
become
less and less important once the hosts are synced up to RHN. I know
that
most of the packages are the same version or close enough to it, but
the
product testers want to see the same version exactly. So is there a
way to
sync to RHN on a specific point release?





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I ran into a similar problem. What I did was in QA, had one of the
boxes be my "golden" box. On that box I installed the yum-downloadonly
plugin, and ran the following command:
yum update --downloadonly --downloaddir=/var/updaterollup -y

This will pull down all updates to make the box current, and store
them in the /var/updaterollup directory (you will need to create it).
Then, you can copy this set of patches across each of your servers and
install. It guarantees that everything has the same version installed.
Thus far its worked pretty well, though occasionally RPM will bitch
that versions don't match. Given that its the same thing yum would
have run, you can probably safely force the installation.

We have been doing this but utilizing opsware/hp server automation to
deploy the packages. Usually the first remediation will install any
kernel updates and libraries, and then the second remediation will
install all other software.


You mentioned the systems are synced to RHN.

The easiest solution appears to be to use the package profile sync option
to get all boxes aligned.

Then create a system group for the four boxes and execute any update
command on that group rather than on the individual servers.

That way you avoid having to download the packages, and especially having
to force any update.

@Matty: why would "force" ever be required even in the scenario you
propose?
If the boxes start from the same point you would download all required
packages on the first box and if they're not at the same starting point you
need to allow yum to pull in whatever dependencies are missing or risk
breaking packages.
-----Original Message-----
From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-
bounces@xxxxxxxxxx] On Behalf Of Matty Sarro
Sent: vrijdag 9 december 2011 13:39
To: General Red Hat Linux discussion list
Subject: RE: Patching Red-Hat to a specific version.

@Bram
I've found it to mostly happen if you use rpm to install the packages using
some command like "rpm -Uvh *.rpm". Rpm will go through in alphabetical
order (I think) and occasionally try to install a package who hasn't yet
had its required library update installed yet because the library comes
later in the alphabet. Now it could just be an issue with using rpm, in
which case yum localinstall may fix it, but it does happen. Give it a shot
and you'll see what I mean. This goes doubly for kernel updates (not that
you should ever run an rpm update with a kernel package).
-Matty

I rarely use rpm directly anymore, yum takes care of most of this for you.  But I was under the impression that even rpm would somehow sort rpm packages specified by such glob in the correct way.

As I wrote I would avoid all this manual work by using groups or even channels in RHN.  After all the entire purpose of FLOSS is to avoid reinventing the wheel. :)

Regards

Bram

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I really need to pull myself up to date on the finer points of RHN,
I'm so used to not having it that I always forget about using it as
more than just a repository :) I'll have to check it out!

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