Re: dhcpd (via systemd) @boottime which does not wait for the interface..

lejeczek <peljasz@xxxxxxxxxxx> · Thu, 12 May 2016 17:23:04 +0100

  On Fri, 2016-05-06 at 07:41 -0400, Laine Stump wrote:

    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?)
yes, set up like this: 
 <forward mode='route'/>
  <bridge name='virbr0' stp='on' delay='0'/>

It really is simple plain vanilla setup, maybe not common but simple, should be easy to reproduce: libvirtd's only one virbr0 and dhcpd to listen only on this iface.

        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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