How to get random subset of large rrset (30+ IPs for round robin)?

[Matus UHLAR - fantomas]

>On Fri, Mar 20, 2020 at 3:14 AM David Klatt <d.klatt at sonnen.de> wrote:
>> I can't find a way to do the following although I invested plenty of time
>> in research - maybe you guys have an idea:
>>
>> With bind, I'd need to serve a single A record with  30+  IP addresses  and
>> these addresses have to be returned in random order round robin,
>> which is done with:

>> Now I'd like bind to just return a  random subset  of e.g. 5 IP addresses
>> if someone requests this A record.

On 20.03.20 10:37, Warren Kumari wrote:
>I realize that this is the BIND list, but this sounds like an almost
>perfect example of PowerDNS's LUA record type (or something with
>CoreDNS)
>Other than that, the only thing I can think of is BIND with DLZ and a
>database that returns a random subset from a DB query, but that sounds
>awful...

I don't think BIND can do this at all. And I don't think it should...

>> Reason for this are in my case some (thousands) older clients (that I can't control)
>> that seem not being able to handle that many IPs - the OS resolver just returns an error.

why no use IPVS-like load balancer and hide all hosts behind one or two IPs?
that would help you much more, amongst others when any of those machines
fails.


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Matus UHLAR - fantomas, uhlar at fantomas.sk ; http://www.fantomas.sk/
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