netdev - Re: Netconsole and logging everything from /dev/console

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Message-ID: <20071116185036.GH19691@waste.org>
Date:	Fri, 16 Nov 2007 12:50:36 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Martin Michlmayr <tbm@...ius.com>
Cc:	Satyam Sharma <satyam.sharma@...il.com>, netdev@...r.kernel.org,
	hpa@...or.com
Subject: Re: Netconsole and logging everything from /dev/console

On Fri, Nov 16, 2007 at 06:43:15PM +0100, Martin Michlmayr wrote:
> I'm supporting a number of consumer devices (e.g. small NAS devices)
> in Debian.  They typically don't export the serial console and don't
> have any other output devices.  We perform the installation via SSH
> on such devices and start SSH automatically when the system boots so
> people can login.  This works pretty well but sometimes a device stops
> to boot for no good reason.  This is usually really hard to debug
> since we don't have any logs at all.
> 
> I could activate netconsole in order to see kernel messages but then I
> still wouldn't see anything that's printed by the ramdisk and later
> when services are started.  Ideally, I'd like to have an option for
> netconsole to show every message that is also shown on the console.
> 
> Do you think that would be possible?

It is, definitely, you just need to wire up a tty struct's write
method to netconsole's and add it to the console registration. But I
haven't had any time to work on this in a while.

-- 
Mathematics is the supreme nostalgia of our time.
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