Setup guide # With Ubuntu: https://www.digitalocean.com/community/tutorials/how-to-configure-bind-as-a-private-network-dns-server-on-ubuntu-20-04. With Docker: https://github.com/hugotkk/lab-docker-bind. Zone Transfer # With zone transfer enable, when a DNS record is updated in the primary DNS server, the update will be transferred automatically to the secondary DNS server....