背景
没有脚本时，关闭集群里的Linux机器，需要分别在每台机器执行关机命令，费时费力。
[hadoop@node2 ~]$ sudo init 0
[hadoop@node3 ~]$ sudo init 0
[hadoop@node4 ~]$ sudo init 0
编写脚本
在~/bin目录下，新建guanji.sh脚本文件
[hadoop@node2 bin]$ nano guanji.sh
脚本内容
#!/bin/bash
for host in node4 node3 node2
do
echo =============== $host ===============
ssh $host sudo init 0;
done
添加权限
[hadoop@node2 bin]$ chmod u+x guanji.sh
测试
[hadoop@node2 bin]$ guanji.sh
=============== node4 ===============
Connection to node4 closed by remote host.
=============== node3 ===============
Connection to node3 closed by remote host.
=============== node2 ===============
Connection closing...Socket close.
Connection closed by foreign host.
完成！enjoy it!
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