Root Password Reset: Difference between revisions
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== | == Resetting the root account password on the PVE Host == | ||
The following follows the general method for resetting a root password on a Linux machine, if you have access to the console see e.g.: | |||
* [https://www.debian.org/doc/manuals/debian-reference/ch04.en.html#_securing_the_root_password the Debian Handbook] | |||
* [https://wiki.archlinux.org/title/Reset_lost_root_password the Arch Linux Wiki entry] | |||
* [https://en.wikibooks.org/wiki/Linux_Guide/Reset_a_forgotten_root_password the entry in WikiBooks] | |||
for similar suggestions. | |||
Keep in mind that editing the kernel command-line might need a different key-entry based on your boot-loader (<code>e</code> works for both <code>grub</code> and <code>systemd-boot</code> though). | |||
The method works for Proxmox VE until version 8.1 and should work for many other Linux based Operating systems as well: | |||
=== Method 1 === | === Method 1 === | ||
* Boot into | * Boot into your bootloader (mostly <code>grub</code> or <code>systemd-boot</code>, select your preferred kernel but '''do not press enter'''. | ||
* Press '''e''' to go into '''edit''' mode. | * Press '''e''' to go into '''edit''' mode. | ||
* | * Depending on the boot-loader go to the kernel-commandline entry: | ||
* Scroll to the end of that line and | ** For <code>grub</code>: scroll down to the <code>kernel</code> line you will boot from, it starts with <code>linux /vmlinuz-...</code> | ||
* | ** For <code>systemd-boot</code> the kernel commandline is directly editable | ||
* Scroll to the end of that line, optionally remove the <code>quiet</code> in the line and append <code> init=/bin/bash</code> | |||
* For <code>grub</code> press <code>Ctrl X</code> to boot, for <code>systemd-boot</code> simply press Enter | |||
In the resulting shell: | |||
# Remount / as Read/Write | # Remount / as Read/Write | ||
mount | mount -o remount,rw / | ||
# Change password with | # Change the root account password with | ||
passwd | passwd | ||
# Change any other account password with | |||
passwd username | |||
# type new password, confirm and hit enter and then reboot. | |||
=== Method 2 === | === Method 2 === | ||
* Boot from | * Boot from a Live CD, which supports the <code>/</code> filesystem of your PVE installation (mostly relevant for installs on ZFS) (e.g. a Proxmox install ISO, in debug-mode (second debug-shell)) | ||
* | * Mount the <code>/</code> filesystem in read-write mode at a free directory (e.g.<code>/mnt</code> will be used in this example). | ||
* | ** you might need to do other steps, based on the filesystem, e.g. <code>zpool import -f -R /mnt rpool</code> for ZFS. | ||
* | * Run <code>passwd -R /mnt</code> to set a new password for the <code>root</code> account. | ||
* | * Unmount/export the <code>/</code>-filesystem and reboot. | ||
== Resetting the root account password in a Container == | |||
* Enter the working container and change the password using: | |||
* | |||
pct enter <VMID> | |||
passwd | |||
# enter new password in silent prompt | |||
exit | |||
* If you're still using OpenVZ containers, which are not supported in Proxmox VE 4 or newer, you can use <code>vzctl enter <VEID></code> to enter the container. | |||
== References == | == References == | ||
* [http://c-nergy.be/blog/?p=1777 Griffon's IT Library] - [[Media:Debian-PVE-root-Password-Reset_pdf.zip|Cache]] | * [http://c-nergy.be/blog/?p=1777 Griffon's IT Library] - [[Media:Debian-PVE-root-Password-Reset_pdf.zip|Cache]] | ||
* https://wiki.debian.org/Root | |||
[[Category: HOWTO]] | [[Category: HOWTO]] [[Category:System Administration]] | ||
Latest revision as of 15:49, 22 January 2024
Resetting the root account password on the PVE Host
The following follows the general method for resetting a root password on a Linux machine, if you have access to the console see e.g.:
for similar suggestions.
Keep in mind that editing the kernel command-line might need a different key-entry based on your boot-loader (e works for both grub and systemd-boot though).
The method works for Proxmox VE until version 8.1 and should work for many other Linux based Operating systems as well:
Method 1
- Boot into your bootloader (mostly
gruborsystemd-boot, select your preferred kernel but do not press enter. - Press e to go into edit mode.
- Depending on the boot-loader go to the kernel-commandline entry:
- For
grub: scroll down to thekernelline you will boot from, it starts withlinux /vmlinuz-... - For
systemd-bootthe kernel commandline is directly editable
- For
- Scroll to the end of that line, optionally remove the
quietin the line and appendinit=/bin/bash - For
grubpressCtrl Xto boot, forsystemd-bootsimply press Enter
In the resulting shell:
# Remount / as Read/Write mount -o remount,rw /
# Change the root account password with passwd
# Change any other account password with passwd username
# type new password, confirm and hit enter and then reboot.
Method 2
- Boot from a Live CD, which supports the
/filesystem of your PVE installation (mostly relevant for installs on ZFS) (e.g. a Proxmox install ISO, in debug-mode (second debug-shell)) - Mount the
/filesystem in read-write mode at a free directory (e.g./mntwill be used in this example).- you might need to do other steps, based on the filesystem, e.g.
zpool import -f -R /mnt rpoolfor ZFS.
- you might need to do other steps, based on the filesystem, e.g.
- Run
passwd -R /mntto set a new password for therootaccount. - Unmount/export the
/-filesystem and reboot.
Resetting the root account password in a Container
- Enter the working container and change the password using:
pct enter <VMID> passwd # enter new password in silent prompt exit
- If you're still using OpenVZ containers, which are not supported in Proxmox VE 4 or newer, you can use
vzctl enter <VEID>to enter the container.