Question

我正在使用Docker version 1.12.3和docker-compose version 1.8.1。我有一些服务，包括例如elasticsearch，rabbitmq和webapp

我的问题是服务无法通过其主机访问其他服务，因为docker-compose不会将所有服务热点放在/etc/hosts文件中。我不知道他们的IP，因为它是在docker-compose up阶段定义的。

我使用https://docs.docker.com/compose/networking/而不是networks描述的links功能，因为我执行循环引用而links不支持它。但是使用networks并不会将所有服务主机都放到每个服务节点/etc/hosts文件中。我设置了container_name，我设置了主机名，但什么也没发生。我缺少的是什么;

这是我的docker-compose.yml;

version: '2'

services:
  elasticsearch1:
    image: elasticsearch:5.0
    container_name: "elasticsearch1"
    hostname: "elasticsearch1"
    command: "elasticsearch -E cluster.name=GameOfThrones -E node.name='Ned Stark' -E discovery.zen.ping.unicast.hosts=elasticsearch1,elasticsearch2,elasticsearch3"
    volumes:
      - "/opt/elasticsearch/data"
    ports:
      - "9200:9200"
      - "9300:9300"
    networks:
      - webapp

  elasticsearch2:
    image: elasticsearch:5.0
    container_name: "elasticsearch2"
    hostname: "elasticsearch2"
    command: "elasticsearch -E cluster.name=GameOfThrones -E node.name='Daenerys Targaryen' -E discovery.zen.ping.unicast.hosts=elasticsearch1,elasticsearch2,elasticsearch3"
    volumes:
      - "/opt/elasticsearch/data"
    networks:
      - webapp

  elasticsearch3:
    image: elasticsearch:5.0
    container_name: "elasticsearch3"
    hostname: "elasticsearch3"
    command: "elasticsearch -E cluster.name=GameOfThrones -E node.name='John Snow' -E discovery.zen.ping.unicast.hosts=elasticsearch1,elasticsearch2,elasticsearch3"
    volumes:
      - "/opt/elasticsearch/data"
    networks:
      - webapp


  rabbit1:
    image: harbur/rabbitmq-cluster
    container_name: "rabbit1"
    hostname: "rabbit1"
    environment:
      - ERLANG_COOKIE=abcdefg
    networks:
      - webapp

  rabbit2:
    image: harbur/rabbitmq-cluster
    container_name: "rabbit2"
    hostname: "rabbit2"
    environment:
      - ERLANG_COOKIE=abcdefg
      - CLUSTER_WITH=rabbit1
      - ENABLE_RAM=true
    networks:
      - webapp

  rabbit3:
    image: harbur/rabbitmq-cluster
    container_name: "rabbit3"
    hostname: "rabbit3"
    environment:
      - ERLANG_COOKIE=abcdefg
      - CLUSTER_WITH=rabbit1
    networks:
      - webapp




  my_webapp:
    image: my_webapp:0.2.0
    container_name: "my_webapp"
    hostname: "my_webapp"
    command: "supervisord -c /etc/supervisor/supervisord.conf -n"
    environment:
       - DYNACONF_SETTINGS=settings.prod
    ports:
      - "8000:8000"
    tty: true
    networks:
      - webapp


networks:
  webapp:
    driver: bridge

这就是我理解他们无法相互交流的方式;

我在elasticserach群集初始化时遇到此错误;

Caused by: java.net.UnknownHostException: elasticsearch3

这就是我的码头作曲

docker-compose up

Answer 1

如果容器期望主机名在容器启动时立即可用，这可能是它失败的原因。

在其他容器启动之前，主机名不会存在。您可以使用入口点脚本等待所有主机名都可用，然后exec elasticsearch ...

docker-compose - networks - / etc / hosts未更新

1 个答案: