[Q] How to import / manually edit hosts database for IP reservation?

so if you need to add 30 hosts make file /etc/ethers
cat /etc/ethers
# see man ethers for syntax
00:16:3e:00:00:01 kvm1 10.1.1.150
00:16:3e:00:00:02 kvm2 10.1.1.200

and make custom template for dnsmasq.conf file
mkdir -p /etc/e-smith/templates-custom/etc/dnsmasq.conf
cp /etc/e-smith/templates/etc/dnsmasq.conf/30dhcp /etc/e-smith/templates-custom/etc/dnsmasq.conf/30dhcp
vi /etc/e-smith/templates-custom/etc/dnsmasq.conf/30dhcp
and add at the and of file

read-ethers

and run

signal-event nethserver-dnsmasq-update