[libvirt-users] dhcpd (via systemd) @boottime which does not wait for the interface..

[Laine Stump]

On 05/04/2016 08:40 AM, lejeczek wrote:
> hi users
>
> I have my dhcpd to serve nothing but virbr0 (libvirt), OS is Centos 7.2
> Dhcpd would not start, complaining like this:

Is virbr0 created by libvirt as part of one of its "virtual networks"? 
If so, why are you using dhcpd rather than the dnsmasq that libvirt 
already runs for it (and how are you managing to terminate the dnsmasq 
process run by libvirt so its listening socket doesn't conflict with the 
listener setup by dhcpd?)

>
> No subnet declaration for virbr0 (no IPv4 addresses).
> ** Ignoring requests on virbr0.  If this is not what
>    you want, please write a subnet declaration
>    in your dhcpd.conf file for the network segment
>    to which interface virbr0 is attached. **
>
> and systemctl -l shows:
> ...
> systemd[1]: start request repeated too quickly for dhcpd.service
> ...
>
> but suffice to restart dhcpd and all works!
> I'v customized systemd's service conf, I've put:
>
> After=libvirtd.service
> Requisite=libvirtd.service

If virbr0 is created by libvirt, it's already starting a dnsmasq process 
to handle dhcp requests, so you don't need (and shouldn't be able to 
start) dhcpd listening on it. If virbr0 *isn't* created by libvirt, then 
the change to systemd's configuration won't have any effect.

>
> but this did not help.
> Would you share your thoughts? Systemd list say it's libvirt (wrong)doing.
> many thanks.
> L.
>
>
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