We have two clusters. cluster1 has namespace- test1 and a service running as clusterip we have to call that service from another cluster(cluster2) from namespace dev1.

I have defined externalname service in cluster2 pointing to another externalname service in cluster1. And externalname service in cluster1 points to the original service running as clusterip.

In cluster2:

kind: Service
apiVersion: v1
metadata:
  name: service
  namespace: dev1
  labels:
    app: service
spec:
  selector:
    app: service
  type: ExternalName
  sessionAffinity: None
  externalName: service2.test.svc.cluster.local
status:
  loadBalancer: {}

In cluster1:Externalname service

kind: Service
apiVersion: v1
metadata:
  name: service2
  namespace: test1
  labels:
    app: service
spec:
  selector:
    app: service
  type: ExternalName
  sessionAffinity: None
  externalName: service1.test1.svc.cluster.local
status:
  loadBalancer: {}

in cluster1 clusterip service:

kind: Service
apiVersion: v1
metadata:
  name: service1
  namespace: test1
  labels:
    app: service1
spec:
  ports:
    - name: http
      protocol: TCP
      port: 9099
      targetPort: 9099
  selector:
    app: service1
  clusterIP: 102.11.20.100
  type: ClusterIP
  sessionAffinity: None
status:
  loadBalancer: {}

But, there is no hit to the service in cluster1. I tried to add spec:port:9099 in externalname services as well, still it does not work.

What could be the reason. Nothing specific in logs too