AKS CoreDNS custom rule

coredns-custom.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns-custom
  namespace: kube-system
data:
  test.server: |
    lastcoolnameleft.com:53 {
        log
        errors
        cache 30
        rewrite name substring lastcoolnameleft.com default.svc.cluster.local

        kubernetes cluster.local in-addr.arpa ip6.arpa {
        }

        proxy .  /etc/resolv.conf # you can redirect this to a specific DNS server such as 10.0.0.10
    }