Docker-compose file to build up an ElasticSearch cluster with 1 master node, 1 datanode, and a Kibana instance. (v6.5.4)

1master-1datanode-1kibana.yml

version: '3'
services:
  master:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.5.4
    container_name: master
    environment:
      - cluster.name=elastic-cluster
      - node.name=master
      - node.master=true
      - node.data=false
      - node.ingest=false
      - bootstrap.memory_lock=true
      - ES_JAVA_OPTS=-Xms512m -Xmx512m
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - master-data:/usr/share/elasticsearch/data
    ports:
      - 9200:9200
      - 9300:9300
    networks:
      - elastic-net
  datanode:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.5.4
    container_name: datanode
    environment:
      - cluster.name=elastic-cluster
      - node.name=datanode
      - node.master=false
      - node.data=true
      - bootstrap.memory_lock=true
      - discovery.zen.ping.unicast.hosts=master
      - ES_JAVA_OPTS=-Xms512m -Xmx512m
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - datanode-data:/usr/share/elasticsearch/data
    networks:
      - elastic-net
  kibana:
    image: docker.elastic.co/kibana/kibana:6.5.4
    container_name: kibana
    environment:
      - elasticsearch.url=http://elasticsearch:9200
    ulimits:
      memlock:
        soft: -1
        hard: -1
    ports:
      - 5601:5601
    networks:
      - elastic-net
    links:
      - datanode:elasticsearch

volumes:
  master-data:
    driver: local
  datanode-data:
    driver: local

networks:
  elastic-net: