Root Password Reset

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.:

• the Debian Handbook
• the Arch Linux Wiki entry
• 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 (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 grub or systemd-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 the kernel line you will boot from, it starts with linux /vmlinuz-...
  • For systemd-boot the kernel commandline is directly editable
• Scroll to the end of that line, optionally remove the quiet in the line and append init=/bin/bash
• For grub press Ctrl X to boot, for systemd-boot simply press Enterg

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 another installation of Debian. (One can use a LiveCD to get access to the "/" partition.)
• Then, mount the partition where you have Debian's "/" (root directory), then change directory to /mnt/etc
• Used vim / nano as an editor to edit the file shadow.
• Find the line starting with root: (or another username)
• Delete everything between the first and second colons (:), and the line will now look like:

root::$6$fsdsdgdsg74.:14862:0:99999:7:::

• Reboot and login as root (or another username as used above) without a password.
• At the end use passwd to set a new password for the root account (or passwd username to change any account password).
• Reboot and login as root with the new root password.

Resetting the root account password in a Container

• Enter the working container and change the password using:

pct enter <VEID>
passwd <new password>
exit

• When using OpenVZ containers (up to PVE 3.4) use

vzctl enter <VEID>

to enter the container.

References

• Griffon's IT Library - Cache
• https://wiki.debian.org/Root