linux-kernel - Re: network regression: cannot rename netdev twice

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Message-ID: <CAPXgP13j1abG-ncaGeRgTpZdPc964Q4Yz3XLk8YQm4z5Q07Hkg@mail.gmail.com>
Date:	Thu, 9 Feb 2012 00:48:56 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Valdis.Kletnieks@...edu
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Jiri Slaby <jslaby@...e.cz>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg KH <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org>,
	ML netdev <netdev@...r.kernel.org>
Subject: Re: network regression: cannot rename netdev twice

On Wed, Feb 8, 2012 at 21:06,  <Valdis.Kletnieks@...edu> wrote:
> On Wed, 08 Feb 2012 11:57:18 +0100, Kay Sievers said:
>> On Wed, Feb 8, 2012 at 07:42,  <Valdis.Kletnieks@...edu> wrote:
>
>> > Or is this sort of thing in /etc/udev/rules.d/70-persistent-net.rules
>> > SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:25:90:0b:f2:80", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
>> > what you are trying to move to, and my systems are already onboard and
>> > I should just move along, nothing to see here? ;)
>>
>> Yeah, that's what we did in the past. It works fine if you never have
>> to swap names like eth0 and eth1, with need to free one of the the
>> names with a temporary rename.
>
> Well, if I had my druthers, I'd stick name="net-mgt", "net-pub", and "net-10g"
> in the udev rules, and not care about 1/2/3 and race conditions, because
> meaningful names are easier to not screw up (just last week found a system that
> had eth1 and eth2 reversed in some iptables rules, wouldn't have happened if
> they were -mgt and -pub).
>
> Only thing stopping me is getting iptables to accept '-i net-10g', and the
> distro /etc/sysconfig/network scripts like ifup and ifdown playing nice....
>
> So it sounds like what I want as a sysadmin is the same thing you want
> as a maintainer...

Yeah, that sounds very much like it is.

I want to push some responsibility to the admin, do less automagic,
and personally want to be less responsible for all the unintended
screw-up the automagic is causing everywhere.

Sure, the intention to keep the names like they always have been was
good, but a good intention and a broken model to deliver it, and
continue to pretend we can solve it, is the worst things we can do. :)

Kay
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