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Re: [Xen-users] Tools to take a kernel crash dump.

To: Sreeharsha Totakura <sreeharsha.totakura@xxxxxxx>
Subject: Re: [Xen-users] Tools to take a kernel crash dump.
From: Tej <bewith.tej@xxxxxxxxx>
Date: Mon, 20 Jul 2009 11:24:29 +0530
Cc: Nick Anderson <nick@xxxxxxxxxxxx>, Luke S Crawford <lsc@xxxxxxxxx>, Xen User-List <xen-users@xxxxxxxxxxxxxxxxxxx>
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On Sat, Jul 18, 2009 at 3:55 PM, Sreeharsha
Totakura<sreeharsha.totakura@xxxxxxx> wrote:
> Thanks Guys,
> I have installed netconsole of the server and waiting for the next restart
> (crash).
> A few things I noted while installing netconsole are:
> 1. The netconsole kernel module doesn't work on virtual interfaces.
> 2. The xend service when started will alter the network interfaces. In our
> setup, the real eth0 is changes as peth0 and the eth0 is made virtual. I
> assume this is done to pacify complaining programs whose setting are set to
> use eth0 by default.
> 3. For installing netconsole, use:
>      /sbin/modprobe netconsole
> netconsole=6666@xxxxxxxxxxxxx/peth0,6666@xxxxxxxxxxxxxx/00:1e:37:42:23:22
>      This setting is required because the xen created virtual interface
> eth0 doesn't support pooling. Only the real physical interface (peth0)
> supports it.

It will be better to increase console log level also.

> Thanks again for your responses. Will post the kernel crash errors if  we
> observe any.
> Regards,
> Sree Harsha Totakura
> Member, Open Source Platform - TEG
> Tata Consultancy Services
> Ph:- +91-22-67782038
> Mailto: sreeharsha.totakura@xxxxxxx
> Website: http://www.tcs.com
> ____________________________________________
> Experience certainty.   IT Services
>                  Business Solutions
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> ____________________________________________
> Nick Anderson <nick@xxxxxxxxxxxx> wrote on 07/18/2009 12:47:41 AM:
>> Nick Anderson <nick@xxxxxxxxxxxx>
>> 07/18/2009 12:47 AM
>> To
>> Luke S Crawford <lsc@xxxxxxxxx>
>> cc
>> Sreeharsha Totakura <sreeharsha.totakura@xxxxxxx>, Xen User-List
>> <xen-users@xxxxxxxxxxxxxxxxxxx>
>> Subject
>> Re: [Xen-users] Tools to take a kernel crash dump.
>> Luke S Crawford wrote:
>> > If, for whatever reason, you can't use a serial console, another user
>> > suggested netconsole.  (I haven't gotten netconsole working on a
> xenified
>> > kernel, but that is not to say it can't be done;  I like serial
> consoles
>> > so I didn't spend much time on netconsole)  - the other downside of
>> > netconsole is that it's read only;  fine for looking at your panics,
> but
>> > it won't help you in the aforementioned 'I changed my firewall and
>> now I can't
>> > get in' case.
>> >
>> I have had netconsole working with a debian host. I never did get it
>> working in a domU though (I dont know if it would work the way
>> networking is done). Netconsole isnt too hard to setup but there is one
>> key point. You have to specify the mac address of the destination host.
>> Now if your destination host is not on the same subnet as you you need
>> to specify the mac of your gateway.
>> http://www.cmdln.org/2009/01/21/remote-kernel-logging-with-
>> netconsole-for-fun-and-profit/
>> ForwardSourceID:NT000071EA
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