Re: hotpluggable member of a bridge

[<tomas@tuxteam.de>]

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On Thu, Jan 05, 2017 at 10:07:59AM +0100, Nicolas George wrote:
> Le quintidi 15 nivôse, an CCXXV, Stefan Monnier a écrit :
> > Is there something better?  Like a predefined way to just say that when
> > `usb0` appears, it should be added to `br0` (and ideally, this would
> > also `ifup` the `br0` interface if it's not up yet).
> 
> Not with /etc/network/interfaces and ifupdown, but udev can do all that.

I always thought this is a division of labor between udev (generating
a "hotplug event", like "eth0 link went just up" and ifupdown, declaring
what has to happen (cf. the "allow-hotplug" directive).

But I must admit I never looked to deeply into that to be authoritative.
The docs [1] seem to suggest that, though.

Of course, udev would be involved for other network management systems
too, like NM: ideally, udev just dispatches and normalizes kernel events
and delegates to specialized subsystems. In a pinch you can just sneak
a complete shell script in an udev rule (and I'm guilty of having done
such a thing [2]), but doing this as "system architecture" might lead to
madness :-)

[1] https://www.debian.org/doc/manuals/debian-reference/ch05.en.html
[2] Once, for a customer: inserting the right storage medium (with
   the right UUID) triggered a system backup.

regards
- -- t
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