[systemd-devel] systemd-networkd-wait-online: Wait for specific address family to be online

[J Decker]

goes back to 'can we have a configurable script to run when DHCP assigns
the address?'
Surely it can't be that hard to read a config line, save it, and later
execute a script


On Tue, Sep 6, 2016 at 1:54 PM, Ernst Bammer <herr.ernst at gmail.com> wrote:

> Hi,
> sorry to bring this up again, but maybe somebody is back from vacation
> who can answer this? ;-)
> Best regards, Ernst
>
> On Sun, Jul 24, 2016 at 12:31 PM, Ernst Bammer <herr.ernst at gmail.com>
> wrote:
> > Hi,
> >
> > I have a service that depends on a non-loopback IPv4 address to be
> > available at start-up. My network configuration is done with networkd,
> > it's very simple and basically just:
> >
> > [Match]
> > Name=eth*
> > [Network]
> > DHCP=v4
> >
> > I've added the following to my service:
> >
> > [Unit]
> > Requires=network-online.target
> > After=network-online.target
> >
> > Unfortunately, there is no IPv4 address when the service tries to
> > start (and then crashes).
> > For debugging purposes, I added this to [Service]:
> >
> > ExecStartPre=/bin/sh -c "/bin/cat /run/systemd/netif/links/*"
> > ExecStartPre=/bin/sh -c "/bin/cat /run/systemd/netif/leases/*"
> >
> > On reboot, I see this in the journal:
> >
> > Jul 24 11:41:59 myhost sh[492]: # This is private data. Do not parse.
> > Jul 24 11:41:59 myhost sh[492]: ADMIN_STATE=configured
> > Jul 24 11:41:59 myhost sh[492]: OPER_STATE=degraded
> > Jul 24 11:41:59 myhost sh[492]: FLAGS=69699
> > Jul 24 11:42:00 myhost sh[529]: /bin/cat: /run/systemd/netif/leases/*:
> > No such file or directory
> > Jul 24 11:42:00 myhost systemd[1]: test.service: control process
> > exited, code=exited status=1
> > Jul 24 11:42:00 myhost systemd[1]: Failed to start Test.
> > Jul 24 11:42:00 myhost systemd[1]: Unit test.service entered failed
> state.
> >
> > I suspect the problem might be that the network interface also gets a
> > link-local IPv6 address, and thus systemd-networkd-wait-online
> > immediately returns. If I disable IPv6 on my system (by blacklisting
> > the ipv6 module), it works as expected (s-n-w-o waiting for DHCPV4
> > address).
> >
> > Is there a way to get s-n-w-o to wait for an address family (in my
> > case IPv4) to be available? Or is there any other workaround?
> >
> > FWIW, I'm using Debian 8 Jessie (systemd version 215).
> >
> > Thank you!
> > Ernst
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