Docker-Compose搭建Spark集群的实现方法

来源：jb51　　时间：2022/5/30 9:33:50　　对本文有异议

一、前言

在前文中，我们使用Docker-Compose完成了hdfs集群的构建。本文将继续使用Docker-Compose，实现Spark集群的搭建。

二、docker-compose.yml

对于Spark集群，我们采用一个mater节点和两个worker节点进行构建。其中，所有的work节点均分配1一个core和 1GB的内存。

Docker镜像选择了bitnami/spark的开源镜像，选择的spark版本为2.4.3，docker-compose配置如下：

  master:
    image: bitnami/spark:2.4.3
    container_name: master
    user: root
    environment:
      - SPARK_MODE=master
      - SPARK_RPC_AUTHENTICATION_ENABLED=no
      - SPARK_RPC_ENCRYPTION_ENABLED=no
      - SPARK_LOCAL_STORAGE_ENCRYPTION_ENABLED=no
      - SPARK_SSL_ENABLED=no
    ports:
      - '8080:8080'
      - '7077:7077'
    volumes:
      - ./python:/python
 
  worker1:
    image: bitnami/spark:2.4.3
    container_name: worker1
    user: root
    environment:
      - SPARK_MODE=worker
      - SPARK_MASTER_URL=spark://master:7077
      - SPARK_WORKER_MEMORY=1G
      - SPARK_WORKER_CORES=1
      - SPARK_RPC_AUTHENTICATION_ENABLED=no
      - SPARK_RPC_ENCRYPTION_ENABLED=no
      - SPARK_LOCAL_STORAGE_ENCRYPTION_ENABLED=no
      - SPARK_SSL_ENABLED=no
  worker2:
    image: bitnami/spark:2.4.3
    container_name: worker2
    user: root
    environment:
      - SPARK_MODE=worker
      - SPARK_MASTER_URL=spark://master:7077
      - SPARK_WORKER_MEMORY=1G
      - SPARK_WORKER_CORES=1
      - SPARK_RPC_AUTHENTICATION_ENABLED=no
      - SPARK_RPC_ENCRYPTION_ENABLED=no
      - SPARK_LOCAL_STORAGE_ENCRYPTION_ENABLED=no
      - SPARK_SSL_ENABLED=no

在master节点中，也映射了一个/python目录，用于存放pyspark代码，方便运行。

对于master节点，暴露出7077端口和8080端口分别用于连接spark以及浏览器查看spark UI，在spark UI中，集群状态如下图（启动后）：

如果有需要，可以自行添加worker节点，其中可以修改SPARK_WORKER_MEMORY与SPARK_WORKER_CORES对节点分配的资源进行修改。

对于该镜像而言，默认exec进去是无用户的，会导致一些安装命令权限的不足，无法安装。例如需要运行pyspark，可能需要安装numpy、pandas等库，就无法使用pip完成安装。而通过user: root就能设置默认用户为root用户，避免上述问题。

三、启动集群

同上文一样，在docker-compose.yml的目录下执行docker-compose up -d命令，就能一键构建集群（但是如果需要用到numpy等库，还是需要自己到各节点内进行安装）。

进入master节点执行spark-shell，成功进入：

四、结合hdfs使用

将上文的Hadoop的docker-compose.yml与本次的结合，得到新的docker-compose.yml：

version: "1.0"
services:
  namenode:
    image: bde2020/hadoop-namenode:2.0.0-hadoop3.2.1-java8
    container_name: namenode
    ports:
      - 9870:9870
      - 9000:9000
    volumes:
      - ./hadoop/dfs/name:/hadoop/dfs/name
      - ./input:/input
    environment:
      - CLUSTER_NAME=test
    env_file:
      - ./hadoop.env
 
  datanode:
    image: bde2020/hadoop-datanode:2.0.0-hadoop3.2.1-java8
    container_name: datanode
    depends_on:
      - namenode
    volumes:
      - ./hadoop/dfs/data:/hadoop/dfs/data
    environment:
      SERVICE_PRECONDITION: "namenode:9870"
    env_file:
      - ./hadoop.env
  
  resourcemanager:
    image: bde2020/hadoop-resourcemanager:2.0.0-hadoop3.2.1-java8
    container_name: resourcemanager
    environment:
      SERVICE_PRECONDITION: "namenode:9000 namenode:9870 datanode:9864"
    env_file:
      - ./hadoop.env
 
  nodemanager1:
    image: bde2020/hadoop-nodemanager:2.0.0-hadoop3.2.1-java8
    container_name: nodemanager
    environment:
      SERVICE_PRECONDITION: "namenode:9000 namenode:9870 datanode:9864 resourcemanager:8088"
    env_file:
      - ./hadoop.env
  
  historyserver:
    image: bde2020/hadoop-historyserver:2.0.0-hadoop3.2.1-java8
    container_name: historyserver
    environment:
      SERVICE_PRECONDITION: "namenode:9000 namenode:9870 datanode:9864 resourcemanager:8088"
    volumes:
      - ./hadoop/yarn/timeline:/hadoop/yarn/timeline
    env_file:
      - ./hadoop.env
    
  master:
    image: bitnami/spark:2.4.3-debian-9-r81
    container_name: master
    user: root
    environment:
      - SPARK_MODE=master
      - SPARK_RPC_AUTHENTICATION_ENABLED=no
      - SPARK_RPC_ENCRYPTION_ENABLED=no
      - SPARK_LOCAL_STORAGE_ENCRYPTION_ENABLED=no
      - SPARK_SSL_ENABLED=no
    ports:
      - '8080:8080'
      - '7077:7077'
    volumes:
      - ./python:/python
 
  worker1:
    image: bitnami/spark:2.4.3-debian-9-r81
    container_name: worker1
    user: root
    environment:
      - SPARK_MODE=worker
      - SPARK_MASTER_URL=spark://master:7077
      - SPARK_WORKER_MEMORY=1G
      - SPARK_WORKER_CORES=1
      - SPARK_RPC_AUTHENTICATION_ENABLED=no
      - SPARK_RPC_ENCRYPTION_ENABLED=no
      - SPARK_LOCAL_STORAGE_ENCRYPTION_ENABLED=no
      - SPARK_SSL_ENABLED=no
  worker2:
    image: bitnami/spark:2.4.3-debian-9-r81
    container_name: worker2
    user: root
    environment:
      - SPARK_MODE=worker
      - SPARK_MASTER_URL=spark://master:7077
      - SPARK_WORKER_MEMORY=1G
      - SPARK_WORKER_CORES=1
      - SPARK_RPC_AUTHENTICATION_ENABLED=no
      - SPARK_RPC_ENCRYPTION_ENABLED=no
      - SPARK_LOCAL_STORAGE_ENCRYPTION_ENABLED=no
      - SPARK_SSL_ENABLED=no