core/appmanager/chart/templates/service.yaml

kind: Service 
apiVersion: v1
metadata:
  name: {{ .Values.serviceName }}
  namespace: {{ .Release.Namespace }}
spec:
  type: ClusterIP
  selector:
    app: app-manager
  ports:
    - nodePort: 
      port: {{ .Values.servicePort }}
      targetPort: {{ .Values.containerPort }}