elasticsearch 5.0需要指定绑定ip，不指定的情况下默认会绑定到127.0.0.1上，导致集群节点不能自动发现所以需要指定ip。

注意 自定义网络节点的时候 有可能子网ip已经被占用了 只要换一个子网ip就可以了

以下是配置

version: "2.1"
services:
  elasticsearch_master:
      image: elasticsearch:5
      command: "elasticsearch -E cluster.name=workagram -E  node.master=true -E node.data=false -E network.host=172.23.238.10"
      volumes:
          - /home/elasticsearch/master:/usr/share/elasticsearch/data:rw
      ports:
        - "9200:9200"
        - "9300:9300"
      environment:
        - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
      networks:
        app_net:
          ipv4_address: 172.23.238.10
  elasticsearch1:
      image: elasticsearch:5
      command: "elasticsearch -E cluster.name=workagram -E node.master=false -E node.data=true -E network.host=172.23.238.11 -E discovery.zen.ping.unicast.hosts=elasticsearch_master"
      volumes:
          - /home/elasticsearch/data1:/usr/share/elasticsearch/data:rw
      links:
          - elasticsearch_master
      networks:
        app_net:
          ipv4_address: 172.23.238.11
  elasticsearch2:
      image: elasticsearch:5
      command: "elasticsearch -E cluster.name=workagram -E node.master=false -E node.data=true -E network.host=172.23.238.12 -E discovery.zen.ping.unicast.hosts=elasticsearch_master"
      volumes:
          - /home/elasticsearch/data2:/usr/share/elasticsearch/data:rw
      links:
          - elasticsearch_master
      networks:
        app_net:
          ipv4_address: 172.23.238.12
networks:
  app_net:
    driver: bridge
    ipam:
      driver: default
      config:
      - subnet: 172.23.238.0/24
        gateway: 172.23.238.1