netdev - Re: netconsole fun

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Message-ID: <20121211143004.GA7481@neilslaptop.think-freely.org>
Date:	Tue, 11 Dec 2012 09:30:04 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org
Subject: Re: netconsole fun

On Tue, Dec 11, 2012 at 09:19:52AM -0500, Peter Hurley wrote:
> On Tue, 2012-12-11 at 04:51 +0000, Cong Wang wrote:
> > On Mon, 10 Dec 2012 at 14:17 GMT, Peter Hurley <peter@...leysoftware.com> wrote:
> > > Now that netpoll has been disabled for slaved devices, is there a
> > > recommended method of running netconsole on a machine that has a slaved
> > > device?
> > >
> > 
> > Yes, running it on the master device instead.
> 
> Thanks for the suggestion, but:
> 
> [ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.7.0-rc8-xeon ...... netconsole=@....168.10.99/br0,30000@....168.10.100/xx:xx:xx:xx:xx:xx
> ...
> [ 5.289869] netpoll: netconsole: local port 6665
> [ 5.289885] netpoll: netconsole: local IP 192.168.10.99
> [ 5.289892] netpoll: netconsole: interface 'br0'
> [ 5.289898] netpoll: netconsole: remote port 30000
> [ 5.289907] netpoll: netconsole: remote IP 192.168.10.100
> [ 5.289914] netpoll: netconsole: remote ethernet address xx:xx:xx:xx:xx:xx
> [ 5.289922] netpoll: netconsole: br0 doesn't exist, aborting
> [ 5.289929] netconsole: cleaning up
> ...
> [ 9.392291] Bridge firewalling registered
> [ 9.396805] device eth1 entered promiscuous mode
> [ 9.418350] eth1:  setting full-duplex.
> [ 9.421268] br0: port 1(eth1) entered forwarding state
> [ 9.423354] br0: port 1(eth1) entered forwarding state
> 
> 
> Is there a way to control or associate network device names prior to
> udev renaming?
> 
That looks like a systemd problem (or more specifically a boot dependency
problem).  You need to modify your netconsole unit/service file to start after
all your networking is up.  NetworkManager provides a dummy service file for
this purpose, called networkmanager-wait-online.service

Neil

> Thanks again,
> Peter
> 
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