Am 03.12.2015 um 15:08 schrieb Martin Pitt: > > Guus Sliepen [2015-12-03 13:44 +0100]:
>>> In the medium term I'd be interested in cleaning this up, though. >>> IMHO there needs to be a proper ifupdown-wait-online.service which >>> just starts the virtual interfaces, let all the real ones be >>> handleld by udev hotplug rules, and just waits until all "auto" >>> services are up. This avoids the race condition and unnecessary >>> blocking on udev settle. But this should be discussed in a separate >>> bug, and I'll also send one for moving the "allow-hotplug" handling >>> bits into ifupdown (where they fit much better than in the udev >>> package). >> >> Yes. The only problem though is that it requires the admin to correctly >> specify which interfaces are "auto" and which are "hotplug", because >> ifupdown cannot really figure that out itself. And there might be some >> cases where a virtual interface depends on one or more hotpluggable >> ones. I actually think this ifupdown-wait-online service should block for allow-hotplug devices as well. > Just for the record, Ubuntu has a fairly different approach there: It > never supported "allow-hotplug" really, udev rules dynamically bring > up both "auto" and "allow-hotplug" devices, and there is an > implementation of "ifup-wait-all-auto.service" similar to > systemd-networkd-wait-all-auto.service that waits for all "auto" > interfaces in /e/n/i to be up for up to 2 minutes, and then continues > the boot. Some time ago, I hacked together a little PoC [1]. It considers the "network up" as soon as one interface (besides lo) has been configured. I guess that would be ok for the majority of cases. If a interface has also a IPv6 config, it might make sense to wait for both IPv6 and IPv4 config to be complete. With this little hack, ifupdown under systemd behaved much better, since network-online.target was now properly hooked up for auto or allow-hotplug interfaces, and stuff like NFS mounts worked reliably (at least for simple ifupdown configurations). Michael [1] https://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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