httpoison无法在docker环境中从webapp访问elasticsearch

Question

当试图使用webapp（使用Elixir/Ecto作为后端语言）、postgres数据库、elasticsearch和kibana创建一个项目时，使用以下docker-compose.yaml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://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:  

,

Answer 1

我认为，当您试图从WebApp访问ElasticSearch时，会出现此连接拒绝错误。

在容器内使用localhost是指容器本身。在docker-compose中，如果您想访问侦听特定端口的另一个服务，那么您必须像http:// : 那样为您的URL设置框架

在您的情况下：

使用下面的撰写文件：

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: