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06-kube-Services.md

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Kubernetes Services

  • In Kubernetes, a Service exposes a network application running as one or more Pods in your cluster.
  • Key aim:
    • No need to modify your existing application for an unfamiliar service discovery mechanism.
  • You can run code in Pods:
    • Designed for a cloud-native world.
    • Older containerized apps.
  • A Service makes the set of Pods available on the network for client interaction.

Kubernetes Service Type

Kubernetes Service types allow you to specify what kind of Service you want. The available types and their behaviors are:

  • ClusterIP:

    • Exposes the Service on a cluster-internal IP.
    • Makes the Service reachable only within the cluster.
    • Default type if not specified.
    • Can be exposed to the public internet using an Ingress or Gateway. ClusterIP

  • NodePort:

    • Exposes the Service on each Node's IP at a static port (the NodePort).
    • Sets up a cluster IP address similar to ClusterIP. Node Port

  • LoadBalancer:

    • Exposes the Service externally using an external load balancer.
    • Requires an external load balancer or integration with a cloud provider. LoadBalancer

  • ExternalName:

    • Maps the Service to the contents of the externalName field (e.g., hostname api.foo.bar.example).
    • Configures the cluster's DNS server to return a CNAME record with the external hostname value.
    • No proxying is set up. ExternalName