linux-kernel - Re: [RFC] A logger specialized for receiving from netconsole.

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Message-ID: <x49k3h2n1hy.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 24 Oct 2013 11:15:53 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [RFC] A logger specialized for receiving from netconsole.

Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> writes:

> Background:
>
>   When troubleshooting system freeze problems, obtaining SysRq messages
>   is commonly used. However, sometimes it is impossible to let syslog
>   daemon save the messages. In that case, serial console can be used.
>
>   However, in already-deployed enterprise servers, it is difficult to
>   reboot the system in order to add the serial console to the list of
>   consoles. Also, speak of virtualized servers in the cloud environment,
>   it may be difficult to add the virtual serial console which would
>   require FTP-like access to the log files saved on the virtualization
>   host.
>
>   As I'm working at NTT Open Source Software Center, I'm having
>   difficulties with obtaining SysRq messages from already-deployed
>   RHEL 3/4/5/6 servers where the serial console is not attached yet.

For rhel 3 and 4, you can actually configure netconsole to send syslog
style messages.  Red Hat shipped a userspace package named
netdump-server, which will create a directory per IP, and log netconsole
messages there.  The netdump-0.7.16 source rpm is the latest version I
could find, let me know if you want me to put the sources somewhere for
you.

Cheers,
Jeff
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