Kubernetes – When to use Which ServiceTypes?

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Kubernetes supports different kinds of service types such as following:

  • ClusterIP: The service of type, ClusterIP, can only be exposed to other services running within the same Kubernetes cluster. The default ServiceType is ClusterIP.
    kind: Service
    apiVersion: v1
    metadata:
      name: hello-service
    spec:
      selector:
        app: HelloApp
      ports:
      - protocol: TCP
        port: 80
        targetPort: 9376
        nodePort: 30061
    
  • NodePort: The service of type, NodePort, can be exposed externally at a static port. The service address would look like  NodeIP:NodePort. External APIs can invoke the NodePort services.
  • LoadBalancer: The service of type, LoadBalancer, can be exposed externally using cloud providers’ load balancer.
    kind: Service
    apiVersion: v1
    metadata:
      name: hello-service
    spec:
      selector:
        app: HelloApp
      ports:
      - protocol: TCP
        port: 80
        targetPort: 9376
        nodePort: 30061
      clusterIP: 10.0.171.239
      loadBalancerIP: 78.11.24.19
      type: LoadBalancer
    status:
      loadBalancer:
        ingress:
        - ip: 146.148.47.155
    
  • ExternalName: The service of type, ExternalName, is mapped to an external name, such as helloapp.vitalflux.com.
Ajitesh Kumar
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