A script to install Debian 12 with ZFS root filesystem on a Hetzner dedicated server.
WARNING: all data on the disk will be destroyed.

• Log in to Hetzner Robot self-service portal.
• Select the desired dedicated server.
• Choose "Rescue" menu.
• Select an SSH key.
• Activate the rescue system.
• Reboot the server into a rescue system from either "Reset" menu or via the ssh.
• Connect to the server via the ssh and run rescue system's command zfs to compile and install latest zfs
• Download and run the script:

wget -qO- https://raw.githubusercontent.com/Amunicy/zfs-hetzner-debian/master/hetzner-debian12-zfs-setup.sh | bash -

Upon successful run, the script will reboot the system. You will be able to log in to it using the same SSH key you have used to active the rescue system.

Please note that the drives you intend to format can not be in use!
You can execute mdadm --stop --scan before running the script to halt default software raid operations.

To cope with network failures it's highly recommended to run the commands above inside screen console.
Type man screen for more info.

Example of screen utility usage:

export LC_ALL=en_US.UTF-8 && screen -S zfs

To detach from screen console, hit Ctrl-d then a To reattach, type screen -r zfs