[[email protected] ~]# grub-md5-crypt
Password:
Retype password:
$1$k9fQ//$Fh3/O8i3.9dw4zarIHtIx1

[[email protected] ~]# vim /boot/grub/grub.conf
10 default=0
11 timeout=5
12 splashimage=(hd0,0)/grub/splash.xpm.gz
13 password --md5 $1$k9fQ//$Fh3/O8i3.9dw4zarIHtIx1 <<====全局密碼，不能直接使用e命令編輯啟動標簽
14 hiddenmenu
15 title CentOS (2.6.32-642.1.1.el6.x86_64)
16 password --md5 $1$k9fQ//$Fh3/O8i3.9dw4zarIHtIx1 <<====菜單秘密，輸入菜單密碼才能夠引導系統
17 root (hd0,0)

參考地址：http://kerry.blog.51cto.com/172631/149977/

grub密碼