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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