Other solution (static, but supported I think and also without breaking init.d scripts) is to add static DHCP leases (edit
/etc/config/dhcp or use LuCi -> Network -> DHCP and DNS -> Static Leases). After that you have to restart Knot using
/etc/init.d/resolver restart (this is possibly bug, because I think it should work also without restart).
Verify a solution in file
/tmp/kresd.config. It should contains:
hints['obluda.lan'] = '192.168.10.232'
hints['turris.lan'] = '192.168.10.1'
hints['cloudia.lan'] = '192.168.10.121'
hints['krtko.lan'] = '192.168.10.124'