On 29 August 2016 at 16:39, Igor Cicimov <ig...@encompasscorporation.com> wrote: > On Tue, Aug 30, 2016 at 6:18 AM, Maciej Katafiasz > <mkatafi...@purestorage.com> wrote: >> Be aware though that DNS round-robin reduces the availability of the >> entire setup, since there are no provisions in the protocol for the >> eviction of dead nodes. So unless you're very sure there will never be >> any in your DNS and also have the TTL set to some very low value, >> multiple DNS records will defeat some of the care HAProxy takes to >> ensure it only sends requests to backends that can service them. > > Hmmm, one would think though the backend health check and fail over should > take care of this ... or maybe not??? > > Anyway, in case you use something like Consul which I mentioned before to > provide the DNS records, then Consul itself will remove the failed node from > the DNS record.
Right, I missed the "independent healthchecks" in the original description, in which case it'd work well enough (albeit a low enough TTL value is still a concern). Cheers, Maciej
