zpool create -o canmount=off -o mountpoint=none smith /dev/sdb
zfs create -s -V 5GB smith/debiantpl
ls -lF /dev/zvol/smith/debiantpl
mkfs.ext4 /dev/zvol/smith/debiantpl
mkdir lala/
mount /dev/zvol/smith/debiantpl lala/
(debootstrap...)
freeze the template e.g. as of nov 2025
zfs snapshot smith/debiantpl@nov25
for the purpose of making read-write snapshots (clones) out of it
zfs clone smith/debiantpl@nov25 smith/guest1 ls -lF /dev/zvol/smith/guest1 zfs clone smith/debiantpl@nov25 smith/guest2 ls -lF /dev/zvol/smith/guest2