[dns-operations] Multi-master setups

Bob Harold rharolde at umich.edu
Mon May 20 16:34:10 UTC 2013

Syncing between the two servers would seem to only help in the case where
the masters could only reach the first server, but your slaves could only
reach the second server, which seems unlikely, unless the second
distribution server is closer (network-wise) to the slaves.

I would continue to push for 100% allow-transfer, and set up automated cron
jobs to test and send email for those that are not working.

I plan to use a similar setup, but fortunately I only have about a dozen
masters to contact, so it will be much easier for me.

The only 'clever' alternative I can think of is to change the IP of the
second distribution server to take over the IP of the first server if the
first one fails.  It helps if each server has a second IP that is separate.

Bob Harold
DNS, University of Michigan

On Sat, May 18, 2013 at 8:00 AM,
<dns-operations-request at lists.dns-oarc.net>wrote:

> Message: 1
> Date: Fri, 17 May 2013 16:53:09 +0200
> From: Anand Buddhdev <anandb at ripe.net>
> To: dns-operations at mail.dns-oarc.net
> Subject: [dns-operations] Multi-master setups
> Message-ID: <51964455.9060904 at ripe.net>
> Content-Type: text/plain; charset=ISO-8859-1
> Dear DNS folk,
> I'm thinking about multi-master setups to add some resiliency to our DNS
> infrastructure.
> In our specific case we have a distribution server which slaves several
> zones from various different parties. They also send notify messages to
> this server. Once it transfers a zone, it sends notify messages to our
> public-facing DNS cluster, and they all transfer the zone from it.
> Obviously, this single distribution server is a single point of failure,
> and I'd like to get rid of it.
> The simplest solution is to add a second server to our infrastructure,
> with an identical zone configuration, so that it is also a slave for all
> the same zones. It would also transfer zones directly from the masters,
> and provide AXFR/IXFR to our cluster.
> Adding a second distribution server has management overhead though. We
> have several hundred masters, and even after contacting all of them, we
> will never have a 100% clean setup where the master allows zone
> transfers for both our distribution servers. So if I want to ensure that
> both our distribution servers hold identical copies of zones, then I
> would ideally want them to notify each other, and pull zones off each
> other as well. Do any of you do this?
> Aside from this idea, are there any other clever ideas people have
> implemented?
> Regards,
> Anand Buddhdev
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