httpoison无法在docker环境中从webapp访问elasticsearch

Question

当尝试使用webapp（使用elixir / ecto作为后端语言），postgres数据库，elasticsearch和kibana使用以下docker-compose.yaml文件启动项目时：

version: '3'
services:
  registry:
    restart: always
    image: registry:2
    ports:
      - 443:443
    volumes:
      - /path/data:/var/lib/registry
      - /path/certs:/registry/certs
      - /path/auth:/registry/auth
  webapp:
    build:
      context: ../../../
      dockerfile: config/docker/dev/Dockerfile-dev
    container_name: MyWebApp-dev
    image: 'localhost:443/123'
    environment:
      - ELASTICSEARCH_URL=http://localhost:9200
      - ELASTICSEARCH_HOST=localhost
    ports:
      - "4000:4000"
      - "3000:3000"
    depends_on:
      - db
      - elasticsearch
      - kibana
    networks:
      - esnet
  db:
    image: postgres:10
    container_name: db
    environment:
      - POSTGRES_USER=paul
      - POSTGRES_PASSWORD=SilviaZita1
      - POSTGRES_DB=snitch_dev
    networks:
      - esnet
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.0.1
    container_name: elasticsearch
    environment:
      - node.name=elasticsearch
      - discovery.seed_hosts=es02
      - cluster.initial_master_nodes=elasticsearch,es02
      - cluster.name=docker-cluster
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata01:/usr/share/elasticsearch/data
    ports:
      - 9200:9200
      - 9300:9300
    networks:
      - esnet
  es02:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.0.1
    container_name: es02
    environment:
      - node.name=es02
      - discovery.seed_hosts=elasticsearch
      - cluster.initial_master_nodes=elasticsearch,es02
      - cluster.name=docker-cluster
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata02:/usr/share/elasticsearch/data
    networks:
      - esnet

  kibana:
    image: docker.elastic.co/kibana/kibana:7.0.1
    ports:
      - "5601:5601"
    container_name: kibana
    environment:
      - ELASTICSEARCH_URL=http://elasticsearch:9200
      - ELASTICSEARCH_HOST=elasticsearch
    depends_on:
    - elasticsearch
    networks:
      - esnet

volumes:
  esdata01:
    driver: local
  esdata02:
    driver: local

networks:
  esnet:  

，

我收到以下错误：

**（混合）无法创建索引产品。 MyWebApp-dev | MyWebApp-dev | ％HTTPoison.Error {id：nil，reason :: econnrefused}

有谁知道如何解决这个问题？

Answer 1

当您尝试从您的webapp访问elasticsearch时，我相信您收到此连接被拒绝错误。

在容器内使用localhost引用自身。 在docker-compose中，如果要访问另一个正在侦听特定端口的服务，则必须构建URL，如http://<service-name>:<port>

在你的情况下：

如果你想从webapp容器访问正在监听9200 elasticsearch服务，那么你的URL应该是http://elasticsearch:9200

在你的webapp的服务定义， ELASTICSEARCH_URL和ELASTICSEARCH_HOST使用elasticsearch ，而不是localhost 。

使用以下撰写文件：

version: '3'
services:
  registry:
    restart: always
    image: registry:2
    ports:
      - 443:443
    volumes:
      - /path/data:/var/lib/registry
      - /path/certs:/registry/certs
      - /path/auth:/registry/auth
  webapp:
    build:
      context: ../../../
      dockerfile: config/docker/dev/Dockerfile-dev
    container_name: MyWebApp-dev
    image: 'localhost:443/123'
    environment:
      - ELASTICSEARCH_URL=http://elasticsearch:9200
      - ELASTICSEARCH_HOST=elasticsearch
    ports:
      - "4000:4000"
      - "3000:3000"
    depends_on:
      - db
      - elasticsearch
      - kibana
    networks:
      - esnet
  db:
    image: postgres:10
    container_name: db
    environment:
      - POSTGRES_USER=paul
      - POSTGRES_PASSWORD=SilviaZita1
      - POSTGRES_DB=snitch_dev
    networks:
      - esnet
  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.0.1
    container_name: elasticsearch
    environment:
      - node.name=elasticsearch
      - discovery.seed_hosts=es02
      - cluster.initial_master_nodes=elasticsearch,es02
      - cluster.name=docker-cluster
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata01:/usr/share/elasticsearch/data
    ports:
      - 9200:9200
      - 9300:9300
    networks:
      - esnet
  es02:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.0.1
    container_name: es02
    environment:
      - node.name=es02
      - discovery.seed_hosts=elasticsearch
      - cluster.initial_master_nodes=elasticsearch,es02
      - cluster.name=docker-cluster
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata02:/usr/share/elasticsearch/data
    networks:
      - esnet

  kibana:
    image: docker.elastic.co/kibana/kibana:7.0.1
    ports:
      - "5601:5601"
    container_name: kibana
    environment:
      - ELASTICSEARCH_URL=http://elasticsearch:9200
      - ELASTICSEARCH_HOST=elasticsearch
    depends_on:
    - elasticsearch
    networks:
      - esnet

volumes:
  esdata01:
    driver: local
  esdata02:
    driver: local

networks:
  esnet: