kong ring-balancer problem.

[Ma Yiwei]

Hi:

I have some trouble when using kong as api gateway, anyone can help me?

It's my env:

kong‘s’ domain name: 'api.a.com', configured ring-balancer.

apis:

{
  "hosts": [
    "ml.a.com"
  ],
  "upstream_send_timeout": 60000,
  "retries": 5,
  "http_if_terminated": true,
  "https_only": false,
  "name": "ml",
  "uris": [
    "/ml"
  ],
  "id": "1d0ac719-0d3a-4c1d-837a-a31bc5371548",
  "upstream_read_timeout": 60000,
  "preserve_host": true,
  "created_at": 1511407744000,
  "upstream_connect_timeout": 60000,
  "upstream_url": "http://ml.a.com",
  "strip_uri": true
}

upstreams:

{
  "created_at": 1511407613130,
  "name": "ml.a.com",
  "id": "9c18d009-9593-425f-9d8a-f761ee75b907",
  "slots": 100,
  "orderlist": [
    10,
    5,
    2,
    9,
    4,
    3,
    1,
    8,
    7,
    6
  ]
}

targets:

{
  "total": 3,
  "data": [
    {
      "upstream_id": "9c18d009-9593-425f-9d8a-f761ee75b907",
      "created_at": 1511407654325,
      "target": "192.168.0.1:80",
      "id": "a6a325c2-0ff4-4629-a15e-28fca22edfb1",
      "weight": 100
    },
    {
      "upstream_id": "9c18d009-9593-425f-9d8a-f761ee75b907",
      "created_at": 1511407658875,
      "target": "192.168.0.2:80",
      "id": "d46a5695-7d72-47dd-84fc-5c30a2d972fe",
      "weight": 100
    },
    {
      "upstream_id": "9c18d009-9593-425f-9d8a-f761ee75b907",
      "created_at": 1511407662252,
      "target": "192.168.0.3:80",
      "id": "7dd304d5-714c-45a4-a5c6-2714ac3a410e",
      "weight": 100
    }
  ]
}

api server 192.168.0.1-3 runs on Nginx with multi vhosts.

'ml.a.com' is one of those vhosts, and no dns resovled(no dns server).

When request 'api.a.com/ml/style', the browser retuens 404.

I think the reason is missing 'HOST header', then I use command 'curl -H "Host:ml.a.com" http://api.a.com/ml/style' test and get the right answer.

I think if configured kong api parameters 'hosts' and 'preserve_host', kong will forward 'HOST header' to api server, but it seems didn't.

How can I solve this problem?

Thanks all of your help.