hadoop环境搭建之分布式的建立4

一、说在前面

　　今天跟着教程学会了在免密登录的基础上如何单点启动，并写了一个启动脚本。

二、单点启动

======================启动 / 停止=======================

(1)单点启动/停止
    hdfs --daemon start/stop namenode/datanode/secondarynamenode
    yarn --daeon start/stop resourcemanager/nodemanager

(2)群起/群停
    前提：配置ssh免密登录，配置workers文件（hadoop2.x中是slavers）
    在NN的节点（102）：start-dfs.sh/stop-dfs.sh
    在RM的节点（103）：start-yarn.sh/stop-yarn.sh

三、启动脚本

====================mycluster.sh=======================

#!/bin/bash
if [ $# -lt 1 ]
then
        echo "Input Args Error!!!!"
        exit
fi
case $1 in
start)
        echo "================= START HDFS ================="
        ssh hadoop102 /opt/module/hadoop-3.1.3/sbin/start-dfs.sh
        echo "================= START YARN ================="
        ssh hadoop103 /opt/module/hadoop-3.1.3/sbin/start-yarn.sh
;;
stop) 
        echo "================= STOP YARN ================="
        ssh hadoop103 /opt/module/hadoop-3.1.3/sbin/stop-yarn.sh
        echo "================= STOP HDFS ================="
        ssh hadoop102 /opt/module/hadoop-3.1.3/sbin/stop-dfs.sh
;;         
*)
        echo "Input Args Error!!!!"
;;    
esac