Date: Sun, 12 Feb 2006 17:17:23 -0800
From: "Randy.Dunlap" <rdunlap@xenotime.net>
To: "JaniD++" <djani22@dynamicweb.hu>
Cc: mpm@selenic.com, linux-kernel@vger.kernel.org
Subject: Re: netconsole problem
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On Mon, 13 Feb 2006 00:42:00 +0100 JaniD++ wrote:

> 
> ----- Original Message ----- 
> From: "Matt Mackall" <mpm@selenic.com>
> To: "JaniD++" <djani22@dynamicweb.hu>
> Cc: <linux-kernel@vger.kernel.org>
> Sent: Sunday, February 12, 2006 11:43 PM
> Subject: Re: netconsole problem
> 
> 
> > On Sun, Feb 12, 2006 at 11:45:52PM +0100, JaniD++ wrote:
> > > > On Fri, Feb 10, 2006 at 03:23:23PM +0100, JaniD++ wrote:
> > > > > Hello, list,
> > > > >
> > > > > I have a little problem, with netconsole.
> > > > > It does not work for me.
> > > > >
> > > > > On the "client":
> > > > >
> > > > > modprobe netconsole netconsole=@/,514@192.168.2.100/
> > > > > dmesg:
> > > > > netconsole: local port 6665
> > > > > netconsole: interface eth0
> > > > > netconsole: remote port 514
> > > > > netconsole: remote IP 192.168.2.100
> > > > > netconsole: remote ethernet address ff:ff:ff:ff:ff:ff
> > > > > netconsole: local IP 192.168.2.50
> > > > > netconsole: network logging started
> > > > >
> > > > > (kernel: 2.6.15-rc5, and 2.6.16-rc1,2)
> > > > >
> > > > > On the server:
> > > > > ]# netcat -u -l -v -s 192.168.2.100 -p 514
> > > > > 192.168.2.100: inverse host lookup failed: Unknown host
> > > > > listening on [192.168.2.100] 514 ...
> > > > >
> > > > > And nothing comes.
> > > > >
> > > > > The firewall is off on both system.
> > > > > The ping comes from any direction.
> > > > >
> > > > > If i try the remote and local syslog, it works well, two.
> > > > > And in this case, the netlog only displays what the syslog is sends.
> > > > >
> > > > > What can be the problem?
> > > >
> > > > Perhaps your console log level is set too low. Fedora for instance is
> > > > very quiet by default.
> > >
> > > Sorry, i was not clear enough....
> > > The system, what i want to debug is RedHat 9.0, with kernel 2.6.15,
> 2.6.16-*
> > > The syslog server is Fedora, and the syslog to syslog messages is works,
> but
> > > netconsole to syslog (and netconsole to netcat) is the problem,
> including
> > > the init-message!
> > >
> > > At this time i try to receive with another redhat 9, but it looks like
> the
> > > netconsole did not working properly for me. :(
> >
> > Netconsole logging level is based off the _console log level_, which
> > defaults to quiet on recent Redhat releases. If it doesn't show up on
> > the console, netconsole doesn't see it either.
> 
> The netconsole had worked for me some months ago, but i have made some
> changes on the system... (some software, more hardware)
> OK, i will see it.
> Where can i get/set this loglevel?

via Magic Sysrq + number (e.g., alt-sysrq-9)
or via (as root) "echo 9 > /proc/sysrq-trigger"
or via (as root) "echo 9 4 1 7 > /proc/sys/kernel/printk"
(first "cat /proc/sys/kernel/printk" and increase the first value).

For the first one, you need a kernel that has
CONFIG_MAGIC_SYSRQ=y
and also has /proc/sys/kernel/sysrq = 1
(echo 1 > /proc/sys/kernel/sysrq # to enable it)


---
~Randy
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