给普通用户添加root权限

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第一步，以root用户查看/etc/sudoers

[root@ltt2 hadoop]# ls -l /etc/sudoers
-r--r-----. 1 root root 4033 Sep 26 01:24 /etc/sudoers

发现这个文件只读文件，将其更改成可写状态

[root@ltt2 hadoop]# chmod 777 /etc/sudoers
[root@ltt2 hadoop]# ls -l /etc/sudoers
-rwxrwxrwx. 1 root root 4033 Sep 26 01:24 /etc/sudoers

第二步，添加内容到文件内

[root@ltt2 hadoop]# vi /etc/sudoers
..
..
## Allow root to run any commands anywhere
root    ALL=(ALL)       ALL
hadoop     ALL=(ALL)       ALL
..
..

再将文件改为只读

[root@ltt2 bin]# chmod 440 /etc/sudoers
[root@ltt2 bin]# ls -l /etc/sudoers
-r--r-----. 1 root root 4022 Sep 26 01:47 /etc/sudoers

切换普通用户，就可以用sudo命令了

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[root@ltt2 bin]# su hadoop
[hadoop@ltt2 bin]$ sudo shutdown -h now

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for hadoop: 

Broadcast message from hadoop@ltt2.bg.cn
    (/dev/pts/0) at 1:55 ...

The system is going down for halt NOW!

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