Skip to main content

Linux Rescue

RedHat/CentOS

Reset the root's password

For GRUB Bootloader)

系統重開機 -> 進入開機選單

  1. Select the kernel
  2. Press the e key to edit the entry
  3. Select second line (the line starting with the word kernel)
  4. Press the e key to edit kernel entry so that you can append single user mode
  5. Append the letter S (or word Single) to the end of the (kernel) line
  6. Press ENTER key
  7. Now press the b key to boot the Linux kernel into single user mode
  8. At prompt type passwd command to reset password:
mount -t proc proc /proc
mount -o remount,rw /
passwd
sync
reboot

For LILO Bootloader)

Boot: linux single

passwd
sync
reboot

TIP: 除了 single mode 以外,還有另一個 emergency mode 也可以試試看。