Linux:grub密码设置与修改

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grub密码设置与修改

默认GRUB启动参数可以的进入单用户模式从而修改root密码,如果想要给GRUB菜单设置密码，可以修改/etc/grub.conf文件（/boot/grub/grub.conf）

设置grub密码

密码生成

　　grub-md5-crypt  　　生成md5密码

　　grub-crypt 　　　　   生成sha256密码

写入配置文件

vim /etc/grub.conf

  1 # grub.conf generated by anaconda

   #

   # Note that you do not have to rerun grub after making changes to this file

   # NOTICE:  You have a /boot partition.  This means that

   #          all kernel and initrd paths are relative to /boot/, eg.

   #          root (hd0,)

   #          kernel /vmlinuz-version ro root=/dev/sda2

   #          initrd /initrd-[generic-]version.img

   #boot=/dev/sda

  default=

  timeout=

  splashimage=(hd0,)/grub/splash.xpm.gz

  hiddenmenu

  password=123456   #明文密码

  #password --md5 $1$XEWYA/$5HUOCImxTf4UwpYQGMlue/ #密文密码 md5密码123456

  #password --sha-256 $5$hwX.zwZ7EMcJW0Tu$GaZZGQzvAAPfSUpK5mW.Jq3v4hZ/1IludjcWmjwPMT3 #密文密码sha密码123456

  title CentOS (2.6.-642.13..el6.i686.debug)

          root (hd0,)

          kernel /vmlinuz-2.6.-642.13..el6.i686.debug ro root=UUID=a298ed8b-f1b6-409b-a17c-59e72d     rd_NO_LUKS  KEYBOARDTYPE=pc 
　　　　KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF- rd_NO_LV    M rd_NO_DM

          initrd /initramfs-2.6.-642.13..el6.i686.debug.img

  title CentOS (2.6.-642.13..el6.i686)

          root (hd0,)

          kernel /vmlinuz-2.6.-642.13..el6.i686 ro root=UUID=a298ed8b-f1b6-409b-a17c-59e72d401964     rd_NO_LUKS 　　
　　 KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=auto LANG=zh_CN.UTF- rd_NO_LVM rd_N    O_DM

          initrd /initramfs-2.6.-642.13..el6.i686.img

  title CentOS  (2.6.-.el6.i686)

          root (hd0,)