One, the pit that was stepped on

1. You cannot start the elasticsearch cluster with the root account

The root account is used when installing docker. When starting the elasticsearch cluster, an error will be reported.

2. ssh cannot connect to the server

After tossing himself for a long time, he finally raised the work order, and Brother Ali helped to solve it. He must praise him and respond quickly and solve quickly. If you encounter problems with the server and cannot solve them for more than 2 hours, don't do it yourself, unless your purpose is to toss the server. The purpose like me is to learn elasticsearch, so don't spend too much time in other areas and be targeted.

3. Kibana cannot connect to the es cluster

The configuration file is incorrect, you need to specify the master node.

environment:
      - ELASTICSEARCH_HOSTS=http://es01:9200
      # 需要将Kibana配置文件中的小写转换成大写，然后这个才能用于变量，才能被设置到
      - I18N_LOCALE=zh-CN
      - xpack.monitoring.ui.container.elasticsearch.enabled=false

4. Install docker-compose

I tried to install through python-pip, but python-pip could not be installed. After an hour of tossing, I gave up decisively.

 curl -L https://github.com/docker/compose/releases/download/1.24.1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose 

 chmod +x /usr/local/bin/docker-compose

Second, the configuration file

1. Directory structure

/usr/local/elasticsearch
      docker-compose.yml
      data
        es01
        es02
        es03
      config
        es01
          elasticsearch.yml
        es02
          elasticsearch.yml
        es03
          elasticsearch.yml
      logs
        es01
        es02
        es03

2 ， docker-compose.yml

version: '2'
services:
  cerebro:
    image: lmenezes/cerebro:0.8.4
    container_name: cerebro
    ports:
      - "9000:9000"
    command:
      - -Dhosts.0.host=http://elasticsearch:9200
    networks:
      - esnet
  kibana:
    image: kibana:7.3.0
    container_name: kibana
    environment:
      - ELASTICSEARCH_HOSTS=http://es01:9200
      # 需要将Kibana配置文件中的小写转换成大写，然后这个才能用于变量，才能被设置到
      - I18N_LOCALE=zh-CN
      - xpack.monitoring.ui.container.elasticsearch.enabled=false
    ports:
      - 5601:5601
    networks:
      - esnet
  es01:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.3.0
    container_name: es01
    restart: always
    environment:
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - ./data/es01:/usr/share/elasticsearch/data
      - ./config/es01/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
      - ./logs/es01:/usr/share/elasticsearch/logs
    ports:
      - 9200:9200
      - 9300:9300
    networks:
      - esnet
  es02:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.3.0
    container_name: es02
    restart: always
    environment:
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - ./data/es02:/usr/share/elasticsearch/data
      - ./config/es02/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
      - ./logs/es02:/usr/share/elasticsearch/logs
    depends_on:
      - es01
    networks:
      - esnet
  es03:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.3.0
    container_name: es03
    restart: always
    environment:
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - ./data/es03:/usr/share/elasticsearch/data
      - ./config/es03/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml
      - ./logs/es03:/usr/share/elasticsearch/logs
    depends_on:
      - es01
    networks:
      - esnet

networks:
  esnet:

3. The configuration file elasticsearch.yml of the master node of es0

cluster.name: es-cluster
node.name: es01
node.master: true
node.data: false
path.data: /usr/share/elasticsearch/data
path.logs: /usr/share/elasticsearch/logs
bootstrap.memory_lock: true
network.host: 0.0.0.0
http.port: 9200
transport.tcp.port: 9300
discovery.zen.ping.unicast.hosts: ["es01", "es02", "es03"] 
cluster.initial_master_nodes: ["es01","es02","es03"]

http.cors.enabled: true
http.cors.allow-origin: "*"

xpack.security.enabled: false
xpack.security.transport.ssl.enabled: false

4. The configuration file elasticsearch.yml of the data node


```clike
cluster.name: es-cluster
node.name: es02
node.master: false
node.data: true
path.data: /usr/share/elasticsearch/data
path.logs: /usr/share/elasticsearch/logs
bootstrap.memory_lock: true
network.host: 0.0.0.0
http.port: 9200
transport.tcp.port: 9300
discovery.zen.ping.unicast.hosts: ["es01", "es02", "es03"]
cluster.initial_master_nodes: ["es01", "es02", "es03"]

http.cors.enabled: true
http.cors.allow-origin: "*"

xpack.security.enabled: false
xpack.security.transport.ssl.enabled: false