CoreDNS

Corefile (ns1)

# ns1.rauhala.dev
.:53 {
    log
    errors
    cache
    any
}

rauhala.dev {
    file /etc/coredns/db.rauhala.dev
    any
    transfer {
        to 10.135.0.3
    }
    log
}

Corefile (ns2)

# ns2.rauhala.dev

.:53 {
    log
    errors
    cache
    any
}

rauhala.dev {
    any
    secondary {
        transfer from 10.135.0.2
    }
    log
}

docker-compose.yml

version: "3.1"

services:
  coredns:
    image: coredns/coredns:latest
    ports:
      - 53:53/tcp
      - 53:53/udp
    volumes:
      - ./coredns:/etc/coredns
    command: ["-conf", "/etc/coredns/Corefile"]