simple-service-template.yaml

apiVersion: v1
kind: Service
metadata:
  name: backend-service-name # SERVICE_NAME
  labels:
    # we pass selector, to list specific Services:
    # kubectl get svc --selector=KEY_SERVICE_SELECTOR
    application: backend # KEY_SERVICE_SELECTOR: VALUE_SERVICE_SELECTOR
spec:
  type: ClusterIP # options: ClusterIP, NodePort, LoadBalancer, ExternalName
  selector:
    # thanks to this selector, we specify, 
    # to which Pods the Service should forward the traffic
    application: backend # KEY_POD_SELECTOR: VALUE_POD_SELECTOR 
  ports:
  - name: service-port # name of this port within the Service
    protocol: TCP # optional, TCP is set by default, others: UDP, SCTP
    port: 80 # SERVICE_PORT - port exposed by this service
    # Pod's port number (Pod is targeted by the Service)
    targetPort: 8080 # POD_PORT