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Pod label selectors for service routing

Pod label selectors are the mechanism used by Kubernetes Services to determine which Pods in the cluster receive traffic routed through the Service endpoint.^[400-devops-06-kubernetes-k8s-learning-05service-service.md]

By defining a selector, a Service acts as a stable abstraction layer over a dynamic set of Pods.^[400-devops-06-kubernetes-k8s-learning-05service-service.md] When a request is sent to the Service, the load balancer forwards the traffic to one of the matching Pods.

Routing and Load Balancing

Once the Pods are selected via their labels, the Service manages traffic distribution across them.^[400-devops-06-kubernetes-k8s-learning-05service-service.md]

This setup provides a consistent entry point for the application, as the Service remains reachable even if individual Pods are recreated or change their IP addresses. The backend Pods are automatically load-balanced by the Service.

Sources

  • 400-devops-06-kubernetes-k8s-learning-05service-service.md