Hey guys, by default, HAProxy tries to resolve server IPs using an ANY query type, then fails over to resolve-prefer type, then to "remaining" type. So ANY -> A -> AAAA or ANY -> AAAA -> A.
In some cases, ANY query type is ignored or response contains no records, which leads HAProxy to try next query type. Today, 0yvind reported that weave DNS server actually answers with an NX response, preventing HAProxy to failover to next query type (this is by design). Jan, a fellow HAProxy user, already reported me that ANY query types are less and less fashion (for many reasons I'm not going to develop here). Amongs the many way to fix this issue, the one below has my preference: A new resolvers section directive (flag in that case) which prevent HAProxy from sending a ANY query type for the nameservers in this section ie "option dont-send-any-qtype". An other option, would to make HAProxy to failover to next query type in case of NX response. This would also cover the case where a server returns a NX because no AAAA records exists. Any comments are welcome. Baptiste
