/etc/hostid does not exist on a minimal debian system.
ZFS reads its contents for MMP (zpool property multihost set to on), and needs
the value to be stable.
Before the SPL->ZFS merge the spl userspace package wrote the file (by parsing/
mangling the output of hostid (1)) Since ZFS provides the zgenhostid script,
which creates a random 4 byte hostid and writes it to /etc/hostid, we use that
instead. (hostid (1) default to mangling a configured ip of the system, which
can be the same across multiple installs (install happens with the same ip)
Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
