Documents on deployment with consul?

[harryge00]

I am not familiar with consul. I thought I need to run a consul server along with marathon-consul in Mesos-master. And run consul-agent in each Mesos-agent ? I am a bit confused on the relationship between marathon-consul and consul-server, because there is no config about consul-server address...

[harryge00]

I finally set up consul server on the master and consul agent on the Mesos-node. However, I cannot register task to consul...

My marathon app JSON:

{
  "id": "consularppp",
  "cmd": null,
  "cpus": 0.1,
  "mem": 128,
  "disk": 0,
  "instances": 1,
  "container": {
    "docker": {
      "image": "nginx"
    },
    "type": "DOCKER"
  },
  "networks": [
    {
      "mode": "container/bridge"
    }
  ],
  "labels": {
    "consul-tag": "marathon",
    "consul": "",
    "varnish": "tag",
    "metrics": "tag"
  }
}

And marathon-consul log:

Dec 12 04:23:08 master marathon-consul[23974]: time="2018-12-12T04:23:08Z" level=info msg="Got StatusEvent" Id=consularppp.a07d49e9-fdc5-11e8-8989-0242ff8d8593 TaskSta
tus=TASK_STARTING
Dec 12 04:23:08 master marathon-consul[23974]: time="2018-12-12T04:23:08Z" level=info msg="Got StatusEvent" Id=consularppp.a07d49e9-fdc5-11e8-8989-0242ff8d8593 TaskSta
tus=TASK_RUNNING

 # curl http://127.0.0.1:8500/v1/catalog/services
{"consul":[]}

[harryge00]

I read the code and found only healthy services are registered...

[harryge00]

I encounter problem again... How can I use marathon-consul as DNS? My marathon task has registered:

# curl localhost:8500/v1/catalog/service/mes0sttt|python -mjson.tool
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   677  100   677    0     0  46004      0 --:--:-- --:--:-- --:--:-- 48357
[
    {
        "Address": "192.168.65.193",
        "CreateIndex": 1801,
        "Datacenter": "dc1",
        "ID": "4f3c0174-bce2-c138-d9fb-b3aed490eab4",
        "ModifyIndex": 1801,
        "Node": "agent-two",
        "NodeMeta": {
            "consul-network-segment": ""
        },
        "ServiceAddress": "192.168.65.193",
        "ServiceConnect": {},
        "ServiceEnableTagOverride": false,
        "ServiceID": "mes0sttt.04135489-fe7e-11e8-8922-0242d9be3463_mes0sttt_31485",
        "ServiceKind": "",
        "ServiceMeta": {},
        "ServiceName": "mes0sttt",
        "ServicePort": 31485,
        "ServiceProxy": {},
        "ServiceProxyDestination": "",
        "ServiceTags": [
            "marathon",
            "marathon-task:mes0sttt.04135489-fe7e-11e8-8922-0242d9be3463"
        ],
        "ServiceWeights": {
            "Passing": 1,
            "Warning": 1
        },
        "TaggedAddresses": {
            "lan": "192.168.65.193",
            "wan": "192.168.65.193"
        }
    }
]

But I cannot dig the FQDN:

dig @127.0.0.1 -p 8600 mes0sttt.service.consul

; <<>> DiG 9.9.4-RedHat-9.9.4-72.el7 <<>> @127.0.0.1 -p 8600 mes0sttt.service.consul
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 16215
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mes0sttt.service.consul.   IN  A

;; AUTHORITY SECTION:
consul.         0   IN  SOA ns.consul. hostmaster.consul. 1544672991 3600 600 86400 0

;; Query time: 0 msec
;; SERVER: 127.0.0.1#8600(127.0.0.1)
;; WHEN: Thu Dec 13 03:49:51 UTC 2018
;; MSG SIZE  rcvd: 102

Maybe I need a Mesos-DNS in addition to marathon-consul?

[Grant1219]

@harryge00

As long as I enabled DNS in the Consul agent configuration file, all registered services were available via DNS unless they have characters in the name that are not allowed in domain names. The marathon-consul logs will tell you if a service can't be registered with Consul DNS.

Does the consul service resolve in DNS for you? That should be registered by default.

$ dig @127.0.0.1 -p 8600 consul.service.consul +short
10.10.17.88
10.10.17.97
10.10.17.87