prereq on my dev machine

sudo apt install schroot pigz debootstrap syslinux nfs-kernel-server tftpd-hpa xorriso pxelinux zfsutils-linux
cd /lab/livenet/livenet-server
rm -fR /etc/schroot/livenet
ln -s `pwd`/etc/schroot/livenet /etc/schroot/
[ -f /etc/default/livenet ] || cp -a etc/default/livenet /etc/default/livenet

virsh net-edit default

<ip address='192.168.122.1' netmask='255.255.255.0'>
    <tftp root='/livenet/boot'/>
    <dhcp>
      <range start='192.168.122.2' end='192.168.122.254'/>
      <bootp file='/pxelinux.0' />
    </dhcp>
</ip>

virsh net-destroy default
virsh net-start default