DNS SRV returnning wrong hostnames

[janisz]

Client: 0.6.4
Server: 0.6.4

Description of the Issue (and unexpected/desired result)

When obtaining services with DNS SVR backed with prepared query. Returned hostnames could not be resolved by Consul.

Reproduction steps

1. Create prepared query

{
  "ID":"01e751dd-3386-5e9c-f2d1-160799d7c8da",
  "Name":"",
  "Session":"",
  "Token":"",
  "Template":{
    "Type":"name_prefix_match",
    "Regexp":""
  },
  "Service":{
    "Service":"${name.full}",
    "Failover":{
      "NearestN":2,
      "Datacenters":[
        "dc1",
        "dc2"
      ]
    },
    "OnlyPassing":false,
    "Tags":null
  },
  "DNS":{
    "TTL":""
  },
  "CreateIndex":5143303,
  "ModifyIndex":7721140
}

 dig @agent.dc1.consul -p 8600 my-service.query.consul. SRV

;; ANSWER SECTION:
my-service.query.consul. 0  IN  SRV 1 1 31529 my-hostname-from-dc2.node.dc1.consul.

 dig @agent.dc1.consul -p 8600 my-hostname-from-dc2.node.dc1.consul. A

returns no results.

Problem lies in consul adding <dc>.consul from agent performing query not the agent service is located.

[janisz]

I see 2 possible hotfixes

1. Falback to other DC if not found service in local DC: command/agent/dns.go#L394
2. Somehow return proper DC suffix for node: command/agent/dns.go#L747

[maxvt]

Looks like you have the same issue as me. Please take a look at #2219