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196 lines
5 KiB
Text
196 lines
5 KiB
Text
[[chap-how-to-reset-a-root-password]]
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= How to Reset the root Password
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The Fedora docs team
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:revnumber: F36
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:revdate: 2022-01-10
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:category: Administration
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:tags: Password
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[abstract]
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____
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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.
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____
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There are two common methods to reset the root password if it is forgotten or lost.
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* In Rescue Mode
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* Using a Fedora Live Media (USB/DVD/CD)
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[[sect-how-to-reset-the-password-from-emergency-or-single-user-mode]]
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== How to reset the root password in Rescue Mode
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[NOTE]
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====
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Changing passwords as root will not prompt for the old password.
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====
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While booting the system the xref:bootloading-with-grub2.adoc[GRUB2] menu will be displayed.
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To boot the system into rescue mode using `bash` follow these steps:
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. Select the boot entry you wish to edit with the arrow keys.
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. Select the entry you with to edit by pressing *e*.
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. Use the arrow keys to go to select the line beginning with `linux`, `linux16`, or `linuxefi`.
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. Go the the end of that line and include a space and the following `rw init=/bin/bash`.
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+
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[Note]
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====
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If your disk is encrypted, you may need to add `plymouth.enable=0`
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====
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. Press *Ctrl-x* or *F10* to boot the entry
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. Run the command:
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+
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[source,bash]
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----
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passwd
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----
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You will be prompted to enter the new root password twice.
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. Restore the SELinux context and permissions with:
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+
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[source,bash]
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----
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touch /.autorelabel
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----
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[WARNING]
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====
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If you do not restore the SELinux permissions, the boot process may fail.
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You may have to do a hard-reboot and start back at step 1.
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====
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. Reboot the machine with:
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+
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[source,bash]
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----
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/sbin/reboot -f
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----
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The system may take a moment to boot while SELinux relabels its permissions on the filesystem.
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If you see the Plymouth boot screen you can press the `ESC` key on your keyboard to view the SELinux progress.
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Once it is complete, your system is ready and your root password has been successfully changed.
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[[sect-reset-password-using-the-fedora-live-media]]
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== How to reset the root password with a Fedora Live Media
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[NOTE]
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====
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To _download_ and create a live USB of Fedora Workstation, follow the instructions on the xref:creating-and-using-a-live-installation-image.adoc[Fedora USB Live Media Quick Doc].
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__For additional information__, specifically about live media using BTRFS, see also
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https://docs.fedoraproject.org/en-US/quick-docs/bootloading-with-grub2/#restoring-bootloader-using-live-disk[Restoring the bootloader using the Live disk]
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====
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. Boot the Live installation media and choose `Try Fedora`.
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. From the desktop, open a terminal and switch to root using `su` (the system will not ask for a password).
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. To view your hard drive device nodes, enter `df -H` into the terminal.
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For this example we will use `/dev/sda1` for the `/boot` partition and `/dev/sda2` for the root `/` partition.
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If you are using LVM partitions, type: `sudo lvscan` and note the `/dev` path of your root partition.
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For this example we will use `/dev/fedora/root`.
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. Create a directory for the mount point (use the `-p` option to create subdirectories):
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[source,bash]
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----
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mkdir -p /mnt/sysimage/boot
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----
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. Mount the `/` (root) partition (be sure to use the actual device node or LVM path of your root `/` partition):
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To mount root on a *standard partition* scheme enter:
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[source,bash]
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----
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mount /dev/sda2 /mnt/sysimage
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----
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To mount root on an *LVM partition* scheme enter:
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[source,bash]
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----
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mount /dev/fedora/root /mnt/sysimage
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----
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. Continue the process by mounting `/boot`, `proc`, `/dev`, and `/run` with:
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[source,bash]
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----
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mount /dev/sda1 /mnt/sysimage/boot
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mount -t proc none /mnt/sysimage/proc
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mount -o bind /dev /mnt/sysimage/dev
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mount -o bind /run /mnt/sysimage/run
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----
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. `chroot` to the mounted root partition with:
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[source,bash]
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----
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chroot /mnt/sysimage /bin/bash
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----
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. Change the root password:
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[source,bash]
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----
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passwd
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----
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. Exit out of chroot with:
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[source,bash]
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----
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exit
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----
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+
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and exit out of the terminal.
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. Reboot your system and boot from the hard drive.
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Congratulations, your root password has been successfully changed.
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[[sect-additional-troubleshooting]]
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== Additional Troubleshooting
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. If you cannot enter rescue mode because you forgot the Firmware/BIOS password here are some options:
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.. Refer to your computer's documentation for instructions on resetting the Firmware/BIOS password in CMOS memory.
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.. Temporarily move the system hard disk to another machine, and follow the procedures above to reset the root password.
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. If you have set a password for your boot loader, refer to xref:creating-and-using-a-live-installation-image.adoc[Creating and Using a Live Installation Image].
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. If you want to reset the boot loader password, refer to the instructions on how to link:++https://fedoraproject.org/wiki/Reset_Bootloader_Password++[Reset the Bootloader Password].
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