kubernetes - 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 set outside of a Kubernetes cluster but in a network. The ip addresses of all members of the replica set were resolved by /etc/hosts in app servers and db servers.

In an experiment/transition phase, I need to access those mongo db servers from kubernetes pods. However, kubernetes doesn't seem to allow adding custom entries to /etc/hosts in pods/containers.

The MongoDB replica sets are already working with large data set, creating a new replica set in the cluster is not an option.

Because I use GKE, changing any of resources in kube-dns namespace should be avoided I suppose. Configuring or replace kube-dns to be suitable for my need are last thing to try.

Is there a way to resolve ip address of custom hostnames in a Kubernetes cluster?

It is just an idea, but if kube2sky can read some entries of configmap and use them as dns records, it colud be great. e.g. repl1.mongo.local: 192.168.10.100.

EDIT: I referenced this question from https://github.com/kubernetes/kubernetes/issues/12337

Answer 1

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