Am 28.06.2014 18:32, schrieb Andrew Shadura: > Hello, > > On Fri, 27 Jun 2014 21:13:40 +0200 > Michael Biebl <[email protected]> wrote: > >> the udev package ships a udev rule [1], which runs ifup $INTERFACE via >> the net.agent helper. > >> This seems to create a race with the networking SysV init script which >> runs also runs ifup for hotplugged interfaces in ifup_hotplug(). > > Yes, I've noticed that quite a while ago, but haven't found a good way > to resolve the issue.
Can't you just drop if_hotplug() from the networking SysV init script? Is there any downside if you do so? >> Is there a need to ifup allow=hotplug interfaces from within the >> networking init script, seeing that net.aget / 80-networking.rules >> already cover hotplugged interfaces? > > Even if I remove that, there's still probability of races, as net.agent > blocks on the state of the real interface, while it should wait for > ifupdown to do its job first. Not quite sure I see the race here, can you elaborate? >> Aside from that, I do think that it would make sense to move net.agent >> and 80-networking.rules from udev into ifupdown proper. > >> What do you think? > > Yes, I think I need to take that script over and fix that. Thanks for > filing a bug. Ok, I guess we need to coordinate that then as a separate issue. Also given that systemd will be our default init for jessie, we need to improve the current systemd integration. E.g. we should ship a native .service file for the networking init script handling the non-hotplug interfaces. For hotplug interfaces we already have a native [email protected]. We also need think about how to properly daemons which require $network (or network.target in systemd). I have a PoC at [1] which provides a ifupdown-wait-online service. The implementation is pretty basic, e.g. the criteria for network-up is simply that one interface is up (no matter if hotplugged or auto). Tollef mentioned, that we should probably refine that, e.g. add additional checks for a default gateway or wait for both IPv6 and IPv4 configuration (given the interface is configured that way). As said, it's a prove of concept and would be interested in your feedback. Ideally this would go into ifupdown itself. I hope you are open to work with us on improving the systemd/ifupdown integration. Michael [0] http://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/ [1] http://people.debian.org/~biebl/ifupdown-wait-online.tar.gz -- Why is it that all of the instruments seeking intelligent life in the universe are pointed away from Earth?
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