ClusterIP

Service which connect and manage internal traffic between components referring to a virtual ip instead of each single pod ip. For example we have 3 pods for front-end and 3 for back-end. FE wants to communicate with BE, so FE uses the cluster ip and kubernetes decides to which pod send the request.

The following snippet creates a ClusterIP service to forward request to the port 80 to any pod labeled with app: myapp.

apiVersion: v1
kind: Service
metadata:
  name: back-end
spec:
  type: ClusterIP
  ports:
    - targetPort: 80
      port: 80
  selector:
    app: myapp