How to Reset the root Password

The Fedora docs team Version F36 Last review: 2022-01-10

A root password may be set up while installing Fedora Linux, although it is now suggested to leave the root account locked and use sudo. This article describes how to proceed if you have used a root password, but for some reason you can no longer access it.

There are two common methods to reset the root password if it is forgotten or lost.

  • In Rescue Mode

  • Using a Fedora Live Media (USB/DVD/CD)

How to reset the root password in Rescue Mode

Changing passwords as root will not prompt for the old password.

While booting the system the GRUB2 menu will be displayed. To boot the system into rescue mode using bash follow these steps:

  1. Select the boot entry you wish to edit with the arrow keys.

  2. Select the entry you with to edit by pressing e.

  3. Use the arrow keys to go to select the line beginning with linux, linux16, or linuxefi.

  4. Go the the end of that line and include a space and the following rw init=/bin/bash.

    If your disk is encrypted, you may need to add plymouth.enable=0

  5. Press Ctrl-x or F10 to boot the entry

  6. 下記のコマンドを実行:

    passwd

    You will be prompted to enter the new root password twice.

  7. Restore the SELinux context and permissions with:

    touch /.autorelabel

    If you do not restore the SELinux permissions, the boot process may fail. You may have to do a hard-reboot and start back at step 1.

  8. Reboot the machine with:

    /sbin/reboot -f

The system may take a moment to boot while SELinux relabels its permissions on the filesystem. If you see the Plymouth boot screen you can press the ESC key on your keyboard to view the SELinux progress.

Once it is complete, your system is ready and your root password has been successfully changed.

How to reset the root password with a Fedora Live Media

To download and create a live USB of Fedora Workstation, follow the instructions on the Fedora USB Live Media Quick Doc.

For additional information, specifically about live media using BTRFS, see also Restoring the bootloader using the Live disk

  1. Boot the Live installation media and choose Try Fedora.

  2. From the desktop, open a terminal and switch to root using su (the system will not ask for a password).

  3. To view your hard drive device nodes, enter df -H into the terminal. For this example we will use /dev/sda1 for the /boot partition and /dev/sda2 for the root / partition.

    If you are using LVM partitions, type: sudo lvscan and note the /dev path of your root partition. For this example we will use /dev/fedora/root.

  4. Create a directory for the mount point (use the -p option to create subdirectories):

    mkdir -p /mnt/sysimage/boot
  5. Mount the / (root) partition (be sure to use the actual device node or LVM path of your root / partition):

    To mount root on a standard partition scheme enter:

    mount /dev/sda2 /mnt/sysimage

    To mount root on an LVM partition scheme enter:

    mount /dev/fedora/root /mnt/sysimage
  6. Continue the process by mounting /boot, proc, /dev, and /run with:

    mount /dev/sda1 /mnt/sysimage/boot
    
    mount -t proc none /mnt/sysimage/proc
    
    mount -o bind /dev /mnt/sysimage/dev
    
    mount -o bind /run /mnt/sysimage/run
  7. chroot to the mounted root partition with:

    chroot /mnt/sysimage /bin/bash
  8. Change the root password:

    passwd
  9. Exit out of chroot with:

    exit

    and exit out of the terminal.

  10. Reboot your system and boot from the hard drive.

Congratulations, your root password has been successfully changed.

Additional Troubleshooting

  1. If you cannot enter rescue mode because you forgot the Firmware/BIOS password here are some options:

    1. Refer to your computer’s documentation for instructions on resetting the Firmware/BIOS password in CMOS memory.

    2. Temporarily move the system hard disk to another machine, and follow the procedures above to reset the root password.

  2. If you have set a password for your boot loader, refer to Creating and Using a Live Installation Image.

  3. If you want to reset the boot loader password, refer to the instructions on how to Reset the Bootloader Password.