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Re: systemd: how to start a service (kea DHCP4) after all network interfaces are up?

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On 2019-03-18, Markus Schönhaber <debian-user@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

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systemd: how to start a service (kea DHCP4) after all network  interfaces are up? Markus Schönhaber <debian-user@list-post.mks-mail.de> - 2019-03-16 12:50 +0100
  Re: systemd: how to start a service (kea DHCP4) after all network  interfaces are up? john doe <johndoe65534@mail.com> - 2019-03-16 14:40 +0100
    Re: systemd: how to start a service (kea DHCP4) after all network  interfaces are up? Markus Schönhaber <debian-user@list-post.mks-mail.de> - 2019-03-16 19:40 +0100
      Re: systemd: how to start a service (kea DHCP4) after all network interfaces are up? Sven Joachim <svenjoac@gmx.de> - 2019-03-16 21:30 +0100
        Re: systemd: how to start a service (kea DHCP4) after all network  interfaces are up? Markus Schönhaber <debian-user@list-post.mks-mail.de> - 2019-03-17 17:20 +0100
  Re: systemd: how to start a service (kea DHCP4) after all network  interfaces are up? Greg Wooledge <wooledg@eeg.ccf.org> - 2019-03-18 13:50 +0100
    Re: systemd: how to start a service (kea DHCP4) after all network  interfaces are up? Markus Schönhaber <debian-user@list-post.mks-mail.de> - 2019-03-18 14:30 +0100
      Re: systemd: how to start a service (kea DHCP4) after all network  interfaces are up? Curt <curty@free.fr> - 2019-03-18 18:50 +0100
  Re: systemd: how to start a service (kea DHCP4) after all network  interfaces are up? Henning Follmann <hfollmann@itcfollmann.com> - 2019-03-18 20:30 +0100
    Re: systemd: how to start a service (kea DHCP4) after all network  interfaces are up? Markus Schönhaber <debian-user@list-post.mks-mail.de> - 2019-03-18 21:00 +0100

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