[Pdns-users] Automatically delete zones that are deleted on Supermaster

Peter van Dijk peter.van.dijk at netherlabs.nl
Fri Nov 9 06:46:47 UTC 2012


On Nov 8, 2012, at 22:48 , a b wrote:

> > Using purely DNS for zone replication (supermaster) is nice and sounds 
> > great, but also has disadvantages, e.g. it is not reliable: If the 
> > NOTIFY could not be delivered to the slave, then the slave is 
> > inconsistent. So, you need another mechanism to verify and update slaves 
> > which failed to receive the NOTIFY.
> Does this scenario not hold true for any distributed service which relies on network connectivity?

Many protocols for distribution of data have a certain ordering and an acknowledgement mechanism. NOTIFY does have an acknowledgement mechanism (but PowerDNS masters don't do a lot with it) but no ordering. It's easier to lose things with NOTIFY than with other replication protocols.

Kind regards,
Peter van Dijk
Netherlabs Computer Consulting BV - http://www.netherlabs.nl/

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