docker :使用dockercompose 编排一个Hadoop集群

本文使用docker-compose 最简单的方式编排一个Hadoop集群
运行脚本文件：

version: "3"

services:
  namenode:
    image: bde2020/hadoop-namenode:2.0.0-hadoop3.1.2-java8
    container_name: namenode
    ports:
      - 9870:9870
    volumes:
      - hadoop_namenode:/hadoop/dfs/name
    environment:
      - CLUSTER_NAME=test
    env_file:
      - ./hadoop.env

  datanode:
    image: bde2020/hadoop-datanode:2.0.0-hadoop3.1.2-java8
    container_name: datanode
    volumes:
      - hadoop_datanode:/hadoop/dfs/data
    environment:
      SERVICE_PRECONDITION: "namenode:9870"
    env_file:
      - ./hadoop.env
  
  resourcemanager:
    image: bde2020/hadoop-resourcemanager:2.0.0-hadoop3.1.2-java8
    container_name: resourcemanager
    environment:
      SERVICE_PRECONDITION: "namenode:9870 datanode:9864"
    env_file:
      - ./hadoop.env

  nodemanager1:
    image: bde2020/hadoop-nodemanager:2.0.0-hadoop3.1.2-java8
    container_name: nodemanager
    environment:
      SERVICE_PRECONDITION: "namenode:9870 datanode:9864 resourcemanager:8088"
    env_file:
      - ./hadoop.env
  
  historyserver:
    image: bde2020/hadoop-historyserver:2.0.0-hadoop3.1.2-java8
    container_name: historyserver
    environment:
      SERVICE_PRECONDITION: "namenode:9870 datanode:9864 resourcemanager:8088"
    volumes:
      - hadoop_historyserver:/hadoop/yarn/timeline
    env_file:
      - ./hadoop.env
  
volumes:
  hadoop_namenode:
  hadoop_datanode:
  hadoop_historyserver:

运行方式：
docker-compose up
运行 wordcount job
make wordcount
相关的访问地址

Namenode: http://:9870/dfshealth.html#tab-overview
History server: http://:8188/applicationhistory
Datanode: http://:9864/
Nodemanager: http://:8042/node
Resource manager: http://:8088/

配置环境变量
配置参数可以在hadoop.env文件中指定，也可以作为特定服务（如namenode、datanode等）的环境变量指定：

可用配置包括：
/etc/hadoop/core-site.xml CORE_CONF
/etc/hadoop/hdfs-site.xml HDFS_CONF
/etc/hadoop/yarn-site.xml YARN_CONF
/etc/hadoop/httpfs-site.xml HTTPFS_CONF
/etc/hadoop/kms-site.xml KMS_CONF
/etc/hadoop/mapred-site.xml MAPRED_CONF