为什么领事健康检查返回一个空数组？答案

【问题标题】：Why is consul health check returning an empty array?为什么领事健康检查返回一个空数组？
【发布时间】：2018-07-01 20:53:54
【问题描述】：

我们有一个 docker-compose.yml 文件：

version: '3'
services:
  consul:
    container_name: consul
    command: agent -dev -config-dir=/consul/config
    dns: 8.8.8.8
    hostname: consul-docker
    image: docker-registry.mycompany.net/ap/consul-ent:0.9.2
    ports:
      - "8500:8500"
    volumes:
      - ./consul/config/conf.json:/consul/config/conf.json

# https://github.com/gliderlabs/registrator
  registrator:
    command: consul://consul:8500
    container_name: registrator
    depends_on:
      - consul
    image: gliderlabs/registrator:latest
    restart: always
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock

  myservice1:
    container_name: myservice1
    image: docker-registry.mycompany.net/ap/myservice1/develop:latest
    ports:
      - "8080:8080"
      - "5000:5000"

# more services below

当我使用 consul v1 API 转到 http://localhost:8500/v1/health/checks/myservice1 检查健康状态时，它返回一个空数组 []。

根据docker ps和myservice1的日志，myservice1已经Ready了。

myservice1 在http://localhost:8500/ui/#/dc1/services 上显示绿色

myservice1 是一个基于 dropwizard 的 java 微服务。

根据https://www.consul.io/api/health.html，示例回复

$ curl https://consul.rocks/v1/health/service/my-service

看起来像：

[
  {
    "Node": {
      "ID": "40e4a748-2192-161a-0510-9bf59fe950b5",
      "Node": "foobar",
      "Address": "10.1.10.12",
      "Datacenter": "dc1",
      "TaggedAddresses": {
        "lan": "10.1.10.12",
        "wan": "10.1.10.12"
      },
      "Meta": {
        "instance_type": "t2.medium"
      }
    },
    "Service": {
      "ID": "redis",
      "Service": "redis",
      "Tags": ["primary"],
      "Address": "10.1.10.12",
      "Port": 8000
    },
    "Checks": [
      {
        "Node": "foobar",
        "CheckID": "service:redis",
        "Name": "Service 'redis' check",
        "Status": "passing",
        "Notes": "",
        "Output": "",
        "ServiceID": "redis",
        "ServiceName": "redis",
        "ServiceTags": ["primary"]
      },
      {
        "Node": "foobar",
        "CheckID": "serfHealth",
        "Name": "Serf Health Status",
        "Status": "passing",
        "Notes": "",
        "Output": "",
        "ServiceID": "",
        "ServiceName": "",
        "ServiceTags": []
      }
    ]
  }
]

根据注册者日志，它看到 myservice1 正常并添加了 myservice1。

任何关于我为什么会看到 [] 响应的想法将不胜感激？

【问题讨论】：

标签： docker docker-compose consul registrator

【解决方案1】：

按照https://gliderlabs.com/registrator/latest/user/backends/ 的说明进行操作后，我能够进行基本的健康检查。我的印象是，在设置 registrator 和 consul 后，健康检查会自动运行。我需要通过在 docker-compose.yml 中提供环境变量来设置 HTTP 检查，例如：

SERVICE_80_CHECK_HTTP=/health/endpoint/path
SERVICE_80_CHECK_INTERVAL=15s
SERVICE_80_CHECK_TIMEOUT=1s     # optional, Consul default used otherwise

【讨论】：