Docker configuration for ElasticSearch cluster

1-single-node-docker-compose.yml

version: '3'
services:
  elasticsearch:
    image: elasticsearch:7.4.2
    container_name: elasticsearch
    environment:
      - discovery.type=single-node
    ulimits:
      memlock:
        soft: -1
        hard: -1
      nofile:
        soft: 16384
        hard: 16384
    ports:
      - 9200:9200

2-two-nodes-docker-compose.yml

version: '3'
services:
  elasticsearch1:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.4.2
    container_name: elasticsearch1
    environment:
      - cluster.name=talent_bank
      - node.name=es1
      - bootstrap.memory_lock=true
      - http.cors.enabled=true
      - http.cors.allow-origin=*
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    ports:
      - 9200:9200
    networks:
      - esnet
  elasticsearch2:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.4.2
    container_name: elasticsearch2
    environment:
      - cluster.name=talent_bank
      - node.name=es2
      - bootstrap.memory_lock=true
      - http.cors.enabled=true
      - http.cors.allow-origin=*
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
      - "discovery.zen.ping.unicast.hosts=elasticsearch1"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    networks:
      - esnet

3-three-nodes-docker-compose.yml

version: '3'
services:
  elasticsearch1:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.4.2
    container_name: elasticsearch1
    environment:
      - cluster.name=talent_bank
      - node.name=es1
      - bootstrap.memory_lock=true
      - http.cors.enabled=true
      - http.cors.allow-origin=*
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    ports:
      - 9200:9200
    networks:
      - esnet
  elasticsearch2:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.4.2
    container_name: elasticsearch2
    environment:
      - cluster.name=talent_bank
      - node.name=es2
      - bootstrap.memory_lock=true
      - http.cors.enabled=true
      - http.cors.allow-origin=*
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
      - "discovery.zen.ping.unicast.hosts=elasticsearch1"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    networks:
      - esnet
elasticsearch3:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.4.2
    container_name: elasticsearch3
    environment:
      - cluster.name=talent_bank
      - node.name=es3
      - bootstrap.memory_lock=true
      - http.cors.enabled=true
      - http.cors.allow-origin=*
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
      - "discovery.zen.ping.unicast.hosts=elasticsearch1"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    networks:
      - esnet