Moving dynamic zones to new master+slave pair without interruptions

Niall O'Reilly niall.oreilly at
Thu Jan 7 09:30:45 UTC 2016

On Wed, 06 Jan 2016 13:16:39 +0000,
Peter Rathlev wrote:
> We currently have two internal DNS servers that are both authoritative
> for a range of internal zones and caching resolvers for our clients. We
> would like to split this so authorizative and caching roles exist on
> different servers. And we would like to do this with as little down
> time as possible, also for dynamic zones.
> Moving static zones is of course trivial. Moving dynamic zones is what
> I cannot quite wrap my head around.
> I think I want to set up a new slave and AXFR from the existing master.

  After reading other messages in this thread, it occurs to me that if
  enough of your client systems use DHCP to configure their stub
  resolvers, you could approach the problem from the other end by just
  adding more caching resolvers (perhaps on a new set of anycast
  addresses) and then change the option (perhaps using a gradual
  per-network roll-out) in the DHCP configuration(s).

  This way, you don't have to worry about moving zones around, and
  still relieve your combined-mode servers of the client query load.

  Niall O'Reilly


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