PowerDNS Recursor: a high performance resolving nameserver
https://www.powerdns.com/
docker run -p 53:53 -p 53:53/udp urelx/pdns-recursor
docker run -p 53:53 -p 53:53/udp urelx/pdns-recursor --forward-zones="localdomain=x.x.x.x:8600" --forward-zones-recurse=".=8.8.8.8"