On Fri, Mar 20, 2020 at 1:04 PM Matus UHLAR - fantomas <uh...@fantomas.sk> wrote: > > >On Fri, Mar 20, 2020 at 3:14 AM David Klatt <d.kl...@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.
That's almost definitely the right answer, but there *are* cases where something like what the OP was asking for - 0.pool.ntp.org springs to mind as one example. But, yes, a load balancer / anycast is almost definitely going to be a better choice... Warren. > > > -- > Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ > Warning: I wish NOT to receive e-mail advertising to this address. > Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. > WinError #98652: Operation completed successfully. > _______________________________________________ > Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe > from this list > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
