In config file /etc/config/resolver add section config resolver 'unbound_includes' with line
list include_path '/etc/unbound/local.conf'
It shall look like this:
config resolver 'unbound_includes' list include_path '/etc/unbound/local.conf'
Below is my setting, you might noticed I'm lame and use several A records instead of CNAME, well actually unbound doesn't support CNAME record.
I created one domain .local and set there few common devices which have global role (central heating, printer, network storage). I also created subdomain .livingroom.local where are devices in living room. I plan other subdomains, because I would like to place several sensors all around the house.
server: local-zone: 'local.' static local-data: 'judo.local. IN A 10.0.0.37' local-data: 'nas.local. IN A 10.0.0.33' local-data: 'nsa320.local. IN A 10.0.0.33' local-data: 'brother.local. IN A 10.0.0.39' local-data: 'printer.local. IN A 10.0.0.39' local-data: 'heating.local. IN A 10.0.0.42' local-data: 'turris.local. IN A 10.0.0.1' local-zone: 'livingroom.local.' static local-data: 'yun.livingroom.local. IN A 10.0.0.43' local-data: 'evolve.livingroom.local. IN A 10.0.0.38' local-data: 'tv.livingroom.local. IN A 10.0.0.38' local-data: 'dvb-t.livingroom.local. IN A 10.0.0.38' local-data: 'switch.livingroom.local. IN A 10.0.0.34' local-data: 'xbox360.livingroom.local. IN A 10.0.0.41' local-data: 'nec.livingroom.local. IN A 10.0.0.40' local-data: 'monitor.livingroom.local. IN A 10.0.0.40' local-data: 'display.livingroom.local. IN A 10.0.0.40' local-data: 'yamaha.livingroom.local. IN A 10.0.0.36' local-data: 'av-reciever.livingroom.local. IN A 10.0.0.36' local-data: 'reciever.livingroom.local. IN A 10.0.0.36'
Now restart unbound service
/etc/init.d/unbound restart
and enjoy