Coredns / openshiftdns add host entry

Kubernetes doesn't use /etc/hosts in order to achieve similar you can add a host entry to coredns or openshiftdns ( based on core dns ).

To do this you need to add a entry to coredns configmap normaly in the kube-system namespace .

Example of a entry for my 192.168.178.170

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

            pods insecure

            fallthrough in-addr.arpa ip6.arpa

        }

        hosts {

           192.168.178.170 unit0-tenant0.instana.fritz.box

           fallthrough

        }

        prometheus 127.0.0.1:9153

        forward . /etc/resolv.conf {