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

Klaus Darilion klaus.mailinglists at pernau.at
Mon Nov 5 13:17:45 UTC 2012

On 29.10.2012 19:55, a b wrote:
>  > You could do the replication in the database (e.g. postgresql with
>  > slony). Then you do not need the supermaster feature.
> That is something we are actually trying to avoid at all costs: we have
> Oracle doing regular notify and transfer requests on port 53.
> We explicitly do not want to depend on any particular database features
> for DNS records' replication.
> However, what we do want is synchronous multimaster replication, which
> gives one HA clustering. Last I checked, "slony" does not do that,
> unless there have been changes since.

True, we only have a Postgresql Master node and replicate to the slave 
nodes. Every public DNS server uses a slave DB. And for HA reasons the 
master has a standby node (domU replication with DRBD).

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.


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