man, first wannabe cloud things and now dedicated servers. I thought I’m the cloud native guy. but hey, this is another reminder for myself how to set up a hetzner dedicated server with btrfs in rescue mode. I think the examples they provided were a bit confusing, at least for me.
We needed a filesystem without the notion of
inodes since we were dealing with millions of super teeny-tiny files and
ext4 wasn’t suitable for this without lots of modifications since we were also using kubernetes with a managed storage controller and couldn’t adapt the ext4 formatting options.
boot into rescue mode, create a file called
installimage.conf and paste this one in there:
# # Hetzner Online GmbH - installimage # # This file contains the configuration used to install this # system via installimage script. Comments have been removed. # # More information about the installimage script and # automatic installations can be found in our wiki: # # http://wiki.hetzner.de/index.php/Installimage # DRIVE1 /dev/sda DRIVE2 /dev/sdb SWRAID 1 SWRAIDLEVEL 1 HOSTNAME your-hostname PART btrfs.1 btrfs all SUBVOL btrfs.1 @ / IMAGE /root/.oldroot/nfs/install/../images/Ubuntu-2004-focal-64-minimal.tar.gz
you may want to edit the
HOSTNAME part and also check if the
IMAGE is still current and the right one.
you can start the installation with
installimage -c installimage.conf
the example above will create a software raid 1 with two drives and use btrfs as the root volume, creating one subvolume located at