Provision Debian for libvirt with debootstrap on a Hetzner host

debootstrap-debian-hetzner.sh

#!/bin/bash

# - expects ZFS on the target host
# - expects ZFS on the target host

# Usage Example
# 
#   ./debootstrap-debian-hetzner.sh www \
#      <ADDITIONAL_IP4_ADDR> \
#      <IP4_ADDR_HOST> \
#      <IP6_NETWORK>

DEBOOTSTRAP_NAME="$1"
IP4_GUEST="$2"
IP4_HOST="$3" # Gateway and DNS IPv4
IP6_GUEST="$4::2"
IP6_HOST="$4::1" # Gateway and DNS IPv6
IP6_NETMASK="80"

MIRROR_URL="https://mirror.hetzner.de/debian/packages"
ZFS_POOL="tank"
VOLUME_SIZE="16G"
DEBIAN_VERSION="stretch"

zfs create -s -V "$VOLUME_SIZE" $ZFS_POOL/vm/$DEBOOTSTRAP_NAME
fdisk /dev/zvol/$ZFS_POOL/vm/$DEBOOTSTRAP_NAME
mkfs.ext4 /dev/zvol/$ZFS_POOL/vm/$DEBOOTSTRAP_NAME-part1

DISK_UUID_STRING=$(blkid /dev/zvol/$ZFS_POOL/vm/$DEBOOTSTRAP_NAME-part1 | awk '{ print $2 }')

CHROOT_DIR=`mktemp -d`
mount /dev/zvol/$ZFS_POOL/vm/$DEBOOTSTRAP_NAME-part1 $CHROOT_DIR

debootstrap --include=resolvconf,vim,rsync,openssh-server,acpid $DEBIAN_VERSION $CHROOT_DIR $MIRRIR_URL

echo "proc $CHROOT_DIR/proc proc defaults 0 0" >> $CHROOT_DIR/etc/fstab
echo "sysfs $CHROOT_DIR/sys sysfs defaults 0 0" >> $CHROOT_DIR/etc/fstab
echo "$DISK_UUID_STRING / ext4 errors=remount-ro 0 1" >> $CHROOT_DIR/etc/fstab
mount --bind /dev /mnt/dev/dev
mount --bind /dev/pts /mnt/dev/pts/dev/pts
mount -t proc proc /mnt/proc
mount -t sysfs sys /mnt/sys

cp /etc/hosts $CHROOT_DIR/etc/hosts
cp /proc/mounts $CHROOT_DIR/etc/mtab

echo "auto lo
iface lo inet loopback

# The primary network interface
allow-hotplug eth0
iface eth0 inet static
  address $IP4_GUEST
  gateway $IP4_HOST
  netmask 255.255.255.255
  dns-nameservers $IP4_HOST
  pointopoint $IP4_HOST
iface eth0 inet6 static
  address $IP6_GUEST
  netmask 80
  gateway $IP6_HOST
  dns-nameservers $IP6_HOST
" > $CHROOT_DIR/etc/network/interfaces

chroot $CHROOT_DIR /bin/bash