Which Kubernetes object provides a stable internal IP for service discovery within the cluster?

Which Kubernetes object provides a stable internal IP for service discovery within the cluster?

• A. Exposes a service on an external IP address outside the cluster
• B. Creates a DNS entry for external access
• C. Provides a stable internal virtual IP within the cluster
• D. Routes traffic directly to individual Pods

Answer: (C)

Inside a Kubernetes cluster, a Service provides a stable internal endpoint for discovering and reaching a group of Pods. The default Service type assigns a stable internal virtual IP, called ClusterIP, which remains constant for the life of the Service even as the underlying Pods come and go. Clients inside the cluster can reach the service via this IP (and a DNS name like myservice.namespace.svc.cluster.local), while kube-proxy forwards requests to the current set of pod endpoints, effectively load-balancing the traffic. This approach is what keeps internal service discovery reliable: the endpoint you connect to doesn’t change when Pods are recreated or rescheduled. Exposing an external IP or DNS entry for external access, or routing directly to individual Pods, would not provide the same stable internal endpoint.

Inside a Kubernetes cluster, a Service provides a stable internal endpoint for discovering and reaching a group of Pods. The default Service type assigns a stable internal virtual IP, called ClusterIP, which remains constant for the life of the Service even as the underlying Pods come and go. Clients inside the cluster can reach the service via this IP (and a DNS name like myservice.namespace.svc.cluster.local), while kube-proxy forwards requests to the current set of pod endpoints, effectively load-balancing the traffic.

This approach is what keeps internal service discovery reliable: the endpoint you connect to doesn’t change when Pods are recreated or rescheduled. Exposing an external IP or DNS entry for external access, or routing directly to individual Pods, would not provide the same stable internal endpoint.