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Re: [Xen-users] How to stop yum update on CentOS 5.1 to modify grub

To: Bas Mevissen <abuse@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] How to stop yum update on CentOS 5.1 to modify grub
From: Rudi Ahlers <Rudi@xxxxxxxxxxx>
Date: Mon, 07 Apr 2008 16:49:41 +0200
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Bas Mevissen wrote:
Rudi Ahlers wrote:

That's what I'm fearing as well. What if the Xen kernel crashes. In this case I'd still need to drive out to the DC - which I don't quite want.

I've installed an IPMI2 module in my server. Costs about Eur 50 and gives you remote monitors (temperature, fans) and serial port-like console. Saved me a few trips to the DC already.

I guess I'll just exclude the normal kernel from the updates as you suggest. P.S. Do you know if one could set a backup / fail-safe kernel in grub, which can automatically boot if thew default kernel gives problems?

Just set UPDATEDEFAULT to "yes" if you want the latest Xen kernel by default and to "no" otherwise. Set DEFAULTKERNEL to "kernel-xen" and simply leave that other kernel around.

Grub is no watchdog. So it cannot detect boot failure. If you want something like that, arrange a budget and contact me :-)


Hi Bas

Unfortunately things work a lot different in our country. I'd like to take up your offer on the watchdog, but I know I won't be able to afford it, especially if you say I need to budget for it. Our currency is about 8times the USD, so for USD100 I need to pay USD800 - which is a lot. And then we still need to pay for import duties, etc. Quite often, the USD100 components end up costing us about USD300's value.

P.S. What is IPMI2? Will it work on standard Pentium IV grade motherboards, or only on Xeon server grade motherboards? And does it get installed on the inside of the server, or how does it work?


Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
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