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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
[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!
>>提君博客原创 http://www.cnblogs.com/tijun/ <<