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The Hetzner Rescue System

The Hetzner Rescue System is a Linux live environment that allows you to have administrative access to your server. The environment starts from the network (PXE boot) and runs in the memory of the server. This makes it possible to carry out repairs to the installed system, to check file systems or to install a new operating system.

Alternatively or additionally, you can use a KVM Console.

Starting the Rescue System

Activating the Rescue System

To start a server in the Rescue System, it needs to be activated in the Robot.

Under "Main Functions; Server" select the desired server and then open the tab "Rescue". Here the desired variant can be activated.

The password that was given to you when you activated the Rescue System can now be used to login as "root" via SSH.

Restarting the Server

To load the Rescue System, the server must be restarted.

If you no longer have access to the server, you can use the reset function in the Robot. You will find this under the "Reset" tab of the desired server.

Please note that the activation of the Rescue System automatically becomes inactive after one hour. If the server is restarted later, the system will boot from the internal drive(s).

Mounting the Drive(s) in the Rescue System

Without Software Raid

You can display the detected drives.

ls /dev/[hsv]d[a-z]*[0-9]*
 
# e.g. /dev/sda /dev/sda1 /dev/sda2 /dev/sda3

You can then mount the desired drive/partition.

mount /dev/sda3 /mnt

With Software Raid

You can display the detected MD devices.

ls /dev/md*
 
# e.g. /dev/md0 /dev/md1 /dev/md2

You can then mount the desired MD device.

mount /dev/md2 /mnt

Mounting LVM Volumes

You can display the LVM Volumes.

ls /dev/mapper/*
 
# e.g. /dev/mapper/vg0-home /dev/mapper/vg0-root /dev/mapper/vg0-swap

You can then mount the desired LVM volumes.

mount /dev/mapper/vg0-root /mnt

Resetting the Root Password

To reset the root password of the server, you must first mount the drives as explained in point 3.

Then use chroot to switch into the mounted system.

chroot-prepare /mnt
 
chroot /mnt

You can now change the password directly by using passwd.

passwd

Installation of an Operating System

Hetzner Online GmbH offers a a comfortable menu-based script called installimage for installing an operating system. Information can be found in the installimage page.

Other Rescue Systems

In addition to the Linux-based Rescue System, Hetzner Online GmbH also offers other rescue systems.

• The FreeBSD Rescue System
• The vKVM Rescue System