Kea DHCP server is the new DHCP server from ISC. Their documentation is good in some parts and absolutely horrible in most parts. Kea adds a database back end to make things easier maintain and configure but they don’t have any documentation about configuring database back end. It took me forever to find bits and pieces of information to get mine up and running. Looking back at mine now I wish I had done even more fine tuning but I can do a rolling upgrade next maintenance window.