Kubernetes Service Concepts
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Internal
Service
A Service is a mechanism that provides reliable networking to a set of pods. As described in the Pod Lifecycle section, pods may come and go, and every time a new replacement pod is brought up, it comes with a new IP address. The service fronts the pods and provides a reliable name and IP for the pods "represented" by that service. Additionally, the is automatically registered with the cluster's DNS service so cluster components can find services by name, which becomes DNS-resolvable. Also, in case of two or more pods, the service load balances requests between the available pods.
ClusterIP
NodePort
LoadBalancer
ExternalName
Endpoint
Endpoint Controller
The endpoint controller is part of the controller manager.