On 2019-03-18, Markus Schönhaber <debian-u...@list-post.mks-mail.de> wrote: > Greg Wooledge, 18.3.2019 13:30 +0100: > >> On Sat, Mar 16, 2019 at 12:31:50PM +0100, Markus Schönhaber wrote: >>> It seems that the DHCP server is started while the interface it is >>> configured to listen on is not yet up and therefore refuses to work. >>> How can I make sure that the kea-dhcp4-server.service is started no >>> sooner than after all network interfaces are up? >> >> 1) Make sure the interface is marked "auto" and NOT "allow-hotplug" >> in /etc/network/interfaces. >> >> Interfaces that are marked "auto" are required to be up before systemd >> will consider network-online.target to be satisfied. Interfaces that >> are marked "allow-hotplug" are NOT required to be up. >> >> Note that the Debian installer marks all interfaces except loopback >> as "allow-hotplug" because it assumes you're using a laptop with a >> Wifi or removable USB network interface, even if the interface is >> actually PCI and internal, or even soldered to the motherboard, even >> if the machine you're installing on is a desktop PC or a rack-mounted >> server. >> >> 2) Make sure your service has >> >> [Unit] >> Wants= network-online.target >> After= network-online.target >> >> either in the native unit file, or in a local drop-in directory. >> >> Services with these options will wait for all network interfaces that >> are marked "auto" to be brought up, before these services can be >> started. > > 1) and 2) was already the case on my machine. Nevertheless the service > was started before the needed interface was up. > That's why I asked in the first place. > > Judging from the info in the other answers I got, it's obviously known > that 1) and 2) are *not* enough to make sure the start of such a service > is delayed until the required interfaces are up. >
Workaround help perhaps in this thread: https://unix.stackexchange.com/questions/209832/debian-systemd-network-online-target-not-working/217768 -- “Let us again pretend that life is a solid substance, shaped like a globe, which we turn about in our fingers. Let us pretend that we can make out a plain and logical story, so that when one matter is despatched--love for instance-- we go on, in an orderly manner, to the next.” - Virginia Woolf, The Waves
