mirror of
https://pagure.io/fedora-docs/quick-docs.git
synced 2024-12-01 07:39:48 +00:00
Revised and formatted reset-root-password for asciidoc
This commit is contained in:
Shaun Assam
Brian (bex) Exelbierd
parent
c406710332
commit
a62094bc2a
2 changed files with 158 additions and 112 deletions
|
|
@ -113,8 +113,8 @@ Topics:
|
|||
# File: postgresql
|
||||
# - Name: (FIX ME!) Raspberry Pi
|
||||
# File: raspberry-pi
|
||||
# - Name: (FIX ME!) How to reset a root password
|
||||
# File: reset-root-password
|
||||
- Name: How to reset a root password
|
||||
File: reset-root-password
|
||||
# - Name: (FIX ME!) Using UEFI with QEMU
|
||||
# File: uefi-with-qemu
|
||||
# - Name: (FIX ME!) Upgrading Fedora using package manager
|
||||
|
|
|
|||
266
en-US/reset-root-password.adoc
Normal file → Executable file
266
en-US/reset-root-password.adoc
Normal file → Executable file
|
|
@ -1,154 +1,200 @@
|
|||
= How to reset a root password
|
||||
[[chap-how-to-reset-a-root-password]]
|
||||
= How to Reset the root Password
|
||||
|
||||
'''
|
||||
Setting up a root password is one of the steps when installing Fedora.
|
||||
If you forget, or lose, the root password, there are two common methods to reset it:
|
||||
|
||||
[IMPORTANT]
|
||||
======
|
||||
* In Rescue Mode
|
||||
|
||||
This page was automatically converted from https://fedoraproject.org/wiki/How_to_reset_a_root_password
|
||||
|
||||
It is probably
|
||||
|
||||
* Badly formatted
|
||||
* Missing graphics and tables that do not convert well from mediawiki
|
||||
* Out-of-date
|
||||
* In need of other love
|
||||
* Using a Fedora Live Media (USB/DVD/CD)
|
||||
|
||||
|
||||
Pull requests accepted at https://pagure.io/fedora-docs/quick-docs
|
||||
[[sect-how-to-reset-the-password-from-emergency-or-single-user-mode]]
|
||||
== How to reset the root password in Rescue Mode
|
||||
|
||||
Once you've fixed this page, remove this notice, and update
|
||||
`_topic_map.yml`.
|
||||
[NOTE]
|
||||
|
||||
Once the document is live, go to the original wiki page and replace its text
|
||||
with the following macro:
|
||||
====
|
||||
|
||||
....
|
||||
{{#fedoradocs: https://docs.fedoraproject.org/whatever-the-of-this-new-page}}
|
||||
....
|
||||
Changing passwords as root does not prompt for the old password.
|
||||
|
||||
======
|
||||
====
|
||||
|
||||
'''
|
||||
While booting the system the link:++grub2.html++[GRUB2] menu will be displayed.
|
||||
To boot the system into rescue mode using `bash` follow these steps:
|
||||
|
||||
. Use the arrow keys to select the boot entry you want to edit
|
||||
|
||||
Setting up a root password is a mandatory part of a Fedora installation.
|
||||
If you forget or otherwise lose your root password, there are procedures
|
||||
to reset it.
|
||||
. Press *e* to edit that entry
|
||||
|
||||
* If you have set a password for your boot loader, refer to
|
||||
link:#using-installation-cd-dvd[ this section].
|
||||
* If you want to reset the boot loader password, refer to
|
||||
link:Reset_Bootloader_Password[ these instructions].
|
||||
* If none of these scenarios apply to you, proceed to
|
||||
link:#Entering_Rescue_Mode[ the next section].
|
||||
. Use the arrow keys to go to the line that starts with `linux`, `linux16`, or `linuxefi`
|
||||
|
||||
Fedora uses _targets_ to determine the services being run when you start
|
||||
your system. Run level 1 can be used as a rescue mode. Booting Linux
|
||||
under run level 1, which is also called _single user mode_, will display
|
||||
a root prompt on bootup, from which you can reset the root password.
|
||||
. Go the the end of that line, add a space then type `rw init=/bin/bash`.
|
||||
If your disk is encrypted, you may need to add `plymouth.enable=0`
|
||||
|
||||
[[entering-rescue-mode]]
|
||||
Entering Rescue Mode
|
||||
~~~~~~~~~~~~~~~~~~~~
|
||||
. Press *Ctrl-x* or *F10* to boot that entry
|
||||
|
||||
[[using-grub2]]
|
||||
Using GRUB2
|
||||
^^^^^^^^^^^
|
||||
. Run the command:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
While booting the system the GRUB2 menu will be displayed, to boot the
|
||||
system using bash follow these steps:
|
||||
----
|
||||
|
||||
* Use the arrow keys to select the boot entry you want to edit
|
||||
* Press *e* to start editing that entry
|
||||
* Use the arrow keys to go to the line that starts with *linux* or
|
||||
*linux16*
|
||||
** If you have a UEFI system it's the line that starts with *linuxefi*
|
||||
* Go the the end of that line add a space then *rw* then another space
|
||||
and *init=/bin/bash*
|
||||
** If your disk is encrypted, you may need to add *plymouth.enable=0* as
|
||||
well
|
||||
* Press *Ctrl-x* or *F10* to boot that entry
|
||||
passwd
|
||||
|
||||
[[changing-root-password]]
|
||||
Changing root password
|
||||
~~~~~~~~~~~~~~~~~~~~~~
|
||||
----
|
||||
+
|
||||
It will prompt you to enter the new root password twice.
|
||||
|
||||
As root, changing password does not ask for your old password. Run the
|
||||
command:
|
||||
. Restore the SELinux context and permissions with:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
....
|
||||
# passwd
|
||||
....
|
||||
----
|
||||
|
||||
Enter your new root password twice. Congratulations! You now have now
|
||||
reset your root password.
|
||||
touch /.autorelabel
|
||||
|
||||
To make sure that selinux context of file which were now modified is
|
||||
restored properly after reboot, run:
|
||||
----
|
||||
|
||||
....
|
||||
# touch /.autorelabel
|
||||
....
|
||||
+
|
||||
|
||||
You can than reboot the machine with
|
||||
[WARNING]
|
||||
|
||||
....
|
||||
# /sbin/reboot -f
|
||||
....
|
||||
====
|
||||
|
||||
[[reset-password-using-a-fedora-cddvd]]
|
||||
Reset Password Using a Fedora CD/DVD
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
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.
|
||||
|
||||
[[using-any-of-the-fedora-live-media]]
|
||||
Using any of the Fedora Live Media
|
||||
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
====
|
||||
|
||||
* Boot the Live installation media
|
||||
* After it finishes booting and starts the live session, open a terminal
|
||||
and switch to root (using `su`, it won't ask for a password)
|
||||
* Create a directory where you can mount the filesystem of your
|
||||
installation:
|
||||
. Reboot the machine with:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
`mkdir /mnt/sysimage`
|
||||
----
|
||||
|
||||
* Mount the filesystem of your installation (/dev/sda1 is just an
|
||||
example, be sure to fill in the actual device node of your installation
|
||||
root */* partition):
|
||||
/sbin/reboot -f
|
||||
|
||||
`mount /dev/sda1 /mnt/sysimage`
|
||||
----
|
||||
|
||||
* chroot to your installation:
|
||||
The system may take a while to boot as SELinux will be relabeling 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.
|
||||
|
||||
`chroot /mnt/sysimage/`
|
||||
[[sect-reset-password-using-the-fedora-live-media]]
|
||||
== How to reset the root password with a Fedora Live Media
|
||||
|
||||
* Change the root password:
|
||||
[NOTE]
|
||||
|
||||
`passwd`
|
||||
====
|
||||
|
||||
* Exit from the chroot:
|
||||
To download and create a live USB of Fedora Workstation, follow the instructions on the link:++live-usb.html++[Fedora USB Live Media Quick Doc].
|
||||
|
||||
`exit`
|
||||
====
|
||||
|
||||
That's it, simply reboot your system and then boot the installation from
|
||||
the HDD as usual.
|
||||
. Boot the Live installation media and choose `Try Fedora`
|
||||
|
||||
[[reset-password-when-bios-is-password-protected]]
|
||||
Reset Password When BIOS is Password Protected
|
||||
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||||
. From the desktop, open a terminal and switch to root using `su` (it won't ask for a password)
|
||||
|
||||
If you cannot enter rescue mode because you forgot the BIOS password
|
||||
required to select an alternate boot device, you have three options:
|
||||
. To view your hard drive device nodes, in the terminal type: `df -H`.
|
||||
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`.
|
||||
|
||||
* Refer to your computer's documentation for instructions on resetting
|
||||
the BIOS password in CMOS memory, usually by moving a physical jumper.
|
||||
* Physically change the boot order.
|
||||
* Temporarily move the system hard disk to another machine, and follow
|
||||
the procedures above to reset the root password.
|
||||
. Create a directory for the mount point (use the `-p` option to create subdirectories):
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
Category:How_to
|
||||
'''
|
||||
----
|
||||
|
||||
See a typo, something missing or out of date, or anything else which can be
|
||||
improved? Edit this document at https://pagure.io/fedora-docs/quick-docs.
|
||||
mkdir -p /mnt/sysimage/boot
|
||||
|
||||
----
|
||||
|
||||
. 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:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
----
|
||||
|
||||
mount /dev/sda2 /mnt/sysimage
|
||||
|
||||
----
|
||||
+
|
||||
To mount root on an *LVM partition* scheme enter:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
----
|
||||
|
||||
mount /dev/fedora/root /mnt/sysimage
|
||||
|
||||
----
|
||||
|
||||
. Continue the process by mounting `/boot`, `proc`, `/dev`, and `/run` with:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
----
|
||||
|
||||
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
|
||||
|
||||
----
|
||||
|
||||
. `chroot` to the mounted root partition with:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
----
|
||||
|
||||
chroot /mnt/sysimage /bin/bash
|
||||
|
||||
----
|
||||
|
||||
. Change the root password:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
----
|
||||
|
||||
passwd
|
||||
|
||||
----
|
||||
|
||||
. Exit out of chroot with:
|
||||
+
|
||||
[source,bash]
|
||||
|
||||
----
|
||||
|
||||
exit
|
||||
|
||||
----
|
||||
+
|
||||
and exit out of the terminal.
|
||||
|
||||
. Reboot your system and boot from the hard drive.
|
||||
|
||||
Congratulations, your root password has been successfully changed.
|
||||
|
||||
[[sect-additional-troubleshooting]]
|
||||
== Additional Troubleshooting
|
||||
|
||||
. If you cannot enter rescue mode because you forgot the Firmware/BIOS password here are some options:
|
||||
|
||||
.. Refer to your computer's documentation for instructions on resetting the Firmware/BIOS password in CMOS memory.
|
||||
|
||||
.. Temporarily move the system hard disk to another machine, and follow the procedures above to reset the root password.
|
||||
|
||||
. If you have set a password for your boot loader, refer to link:++creating-and-using-a-live-installation-image.html++[Creating and Using a Live Installation Image].
|
||||
|
||||
. 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].
|
||||
Loading…
Reference in a new issue