Re: Subject: Re: upgrade OL6 tot OL7 within Cluster
- From: Jeremy Schneider <jeremy.schneider@xxxxxxxxxxxxxx>
- To: Tim Hall <tim@xxxxxxxxxxxxxxx>
- Date: Fri, 18 Dec 2015 12:28:52 -0500
On Fri, Dec 18, 2015 at 12:18 PM, Jeremy Schneider
<jeremy.schneider@xxxxxxxxxxxxxx> wrote:
Oh yeah, I heartily agree. In-place upgrades are a brand new feature
of RH7 and notoriously complex for any Linux distribution. I've done
in-place upgrades of Ubuntu and Debian - and the list of possible
problems and bugs in the upgrade process is always long.
Here's a concrete example:
I once did an in-place upgrade to Ubuntu 14.04 and in the middle of
the upgrade the system unexpectedly and completely lost power. I tried
to troubleshoot. For starters, the half-upgraded operating system
wasn't even bootable. Admittedly there's a lot I don't know about
Ubuntu - but try to salvage the upgrade proved to be so complex that
in the end it seemed easier to just scrap all the data and install
from scratch onto the system, then just pull the data from backups.
(We did have good backups from before we started the upgrade process.)
I'm sure RedHat has tested their in-place upgrade process extensively.
And if you're doing a normal upgrade of a system without too much
customization and if nothing unexpected happens, then I'm sure you'll
be fine. It's the edge cases that get you - customization, unexpected
interruptions, etc.
-J
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