How can I expose a StatefulSet service with ClusterIP None on Google Cloud Platform?

Question

How can I expose a StatefulSet service (cassandra, mysql, etc...) with ClusterIP=None on Kubernetes in Google Cloud Platform?

I need to change the ClusterIP config? Or I need to configure Google Cloud NAT? Or I need to change other things?

Thanks

EDIT: I want to connect to cassandra from an external IP, from anyplace on the internet

EDIT2: I guess that the solution is to use LoadBalance instead of ClusterIP, but when I use LoadBalance, the Cassandra nodes can't find the seed node. Then I sill using ClusterIP=None to Cassandra cluster, and I created another POD with type=LoadBalance to connect to Cassandra and to have connections to exterior. And now it's working :)

Answer 1

If by "expose" you mean ability to reach your service endpoints without cluster IP , then just use selector in your headless service, i.e.

apiVersion: v1
kind: Service
metadata:
  name: cassandra
spec:
  clusterIP: None
  selector:
    app: cassandra
  ports:
  - port: 80
    targetPort: 80

For more details refer to documentation

Otherwise, if you want to expose your deployments outside of the cluster, you won't be able to do it with headless service.

Answer 2

ClusterIP services are not exposed outside of the Kubernetes cluster. Perhaps you mean to use a NodePort or LoadBalancer service instead?