编写myhadoop.sh脚本快捷开启集群，一起开启（关闭）dfs，yarn_启动集群脚本·没有办法关闭dfs

常用命令

1）各个模块分开启动/停止（配置ssh是前提）常用

       （1）整体启动/停止HDFS

start-dfs.sh/stop-dfs.sh

       （2）整体启动/停止YARN

start-yarn.sh/stop-yarn.sh

2）各个服务组件逐一启动/停止

       （1）分别启动/停止HDFS组件

hdfs --daemon start/stop namenode/datanode/secondarynamenode

       （2）启动/停止YARN

hdfs --daemon start/stop namenode/datanode/secondarynamenode

编写Hadoop集群常用脚本

1）Hadoop集群启停脚本（包含HDFS，Yarn，Historyserver）：myhadoop.sh

[atguigu@hadoop102 ~]$ cd /home/atguigu/bin
 
[atguigu@hadoop102 bin]$ vim myhadoop.sh

输入以下内容

#!/bin/bash
 
if [ $# -lt 1 ]
then
    echo "No Args Input..."
    exit ;
fi
 
case $1 in
"start")
        echo " =================== 启动 hadoop集群 ==================="
 
        echo " --------------- 启动 hdfs ---------------"
        ssh hadoop102 "/opt/module/hadoop-3.1.3/sbin/start-dfs.sh"
        echo " --------------- 启动 yarn ---------------"
        ssh hadoop103 "/opt/module/hadoop-3.1.3/sbin/start-yarn.sh"
        echo " --------------- 启动 historyserver ---------------"
        ssh hadoop102 "/opt/module/hadoop-3.1.3/bin/mapred --daemon start historyserver"
;;
"stop")
        echo " =================== 关闭 hadoop集群 ==================="
 
        echo " --------------- 关闭 historyserver ---------------"
        ssh hadoop102 "/opt/module/hadoop-3.1.3/bin/mapred --daemon stop historyserver"
        echo " --------------- 关闭 yarn ---------------"
        ssh hadoop103 "/opt/module/hadoop-3.1.3/sbin/stop-yarn.sh"
        echo " --------------- 关闭 hdfs ---------------"
        ssh hadoop102 "/opt/module/hadoop-3.1.3/sbin/stop-dfs.sh"
;;
*)
    echo "Input Args Error..."
;;
esac

• 保存后退出，然后赋予脚本执行权限

[atguigu@hadoop102 bin]$ chmod +x myhadoop.sh

2）查看三台服务器Java进程脚本：jpsall

[atguigu@hadoop102 ~]$ cd /home/atguigu/bin
 
[atguigu@hadoop102 bin]$ vim jpsall

输入以下内容

#!/bin/bash
 
for host in hadoop102 hadoop103 hadoop104
do
        echo =============== $host ===============
        ssh $host jps 
done

保存后退出，然后赋予脚本执行权限

[atguigu@hadoop102 bin]$ chmod +x jpsall

把配置的文件分发/home/atguigu/bin目录，保证自定义脚本在三台机器上都可以使用

[atguigu@hadoop102 ~]$ xsync /home/atguigu/bin/

检测是否配置好

myhadoop.sh start

myhadoop.sh stop

 

jpsall