如何更改docker-compose中的默认弹性搜索密码？

Question

Elasticsearch的official docker image documentation提供此docker-compose.yml例如：

version: '2' 
services: 
    elasticsearch1: 
    image: docker.elastic.co/elasticsearch/elasticsearch:5.6.3 
    container_name: elasticsearch1 
    environment: 
     - cluster.name=docker-cluster 
     - bootstrap.memory_lock=true 
     - "ES_JAVA_OPTS=-Xms512m -Xmx512m" 
    ulimits: 
     memlock: 
     soft: -1 
     hard: -1 
    mem_limit: 1g 
    volumes: 
     - esdata1:/usr/share/elasticsearch/data 
    ports: 
     - 9200:9200 
    networks: 
     - esnet 
    elasticsearch2: 
    image: docker.elastic.co/elasticsearch/elasticsearch:5.6.3 
    environment: 
     - cluster.name=docker-cluster 
     - bootstrap.memory_lock=true 
     - "ES_JAVA_OPTS=-Xms512m -Xmx512m" 
     - "discovery.zen.ping.unicast.hosts=elasticsearch1" 
    ulimits: 
     memlock: 
     soft: -1 
     hard: -1 
    mem_limit: 1g 
    volumes: 
     - esdata2:/usr/share/elasticsearch/data 
    networks: 
     - esnet 

volumes: 
    esdata1: 
    driver: local 
    esdata2: 
    driver: local 

networks: 
    esnet: 

但是，它没有解释如何自定义密码。它确实指引我们到X-Pack documentation page，但我拒绝相信我必须经历所有的麻烦才能更改密码。在Docker Compose文件中为弹性搜索配置自定义密码有没有更简单，规范的方法？

Answer 1

从6.0开始elasticsearch docker映像可以使用以下环境变量来配置密码 - ELASTIC_PASSWORD。
例如：
搬运工运行-e ELASTIC_PASSWORD = MagicWord docker.elastic.co/elasticsearch/elasticsearch-platinum:6.1.3
参见： https://www.elastic.co/guide/en/elasticsearch/reference/6.1/docker.html