Is there a way to add arbitrary records to kube-dns?

Question

I will use a very specific way to explain my problem, but I think this is better to be specific than explain in an abstract way...

Say, there is a MongoDB replica se

Answer 1

Use configMap seems better way to set DNS, but it's a little bit heavy when just add a few record (in my opinion). So I add records to /etc/hosts by shell script executed by docker CMD.

for example:

Dockerfile

...(ignore)
COPY run.sh /tmp/run.sh
CMD bash /tmp/run.sh

run.sh

#!/bin/bash
echo repl1.mongo.local 192.168.10.100 >> /etc/hosts
# some else command...

Notice, if your run MORE THAN ONE container in a pod, you have to add script in each container, because kubernetes start container randomly, /etc/hosts may be override by another container (which start later).