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You are debugging a network issue: a pod 'frontend' cannot reach a service 'backend' in the same namespace. The service endpoints are empty. What is the most likely cause?
B is correct because the most common reason for empty endpoints in a Kubernetes service is that the service's selector does not match the labels of any running pod. The service controller continuously monitors pods and updates the Endpoints object to include only those pods whose…Read full explanation
You need to collect metrics from an application running in a pod. The application exposes metrics on port 8080 at /metrics in Prometheus format. Which resource should you configure to allow Prometheus to scrape these metrics?
Prometheus uses a pull-based model to scrape metrics from targets. By adding the `prometheus.io/scrape: "true"` and `prometheus.io/port: "8080"` annotations to a Service that selects the pod, you enable Prometheus's built-in service discovery to automatically detect and scrape th…Read full explanation
You are designing a health check strategy for a web application. Which TWO probe types should you configure to ensure that traffic is only sent to pods that are ready to serve?
A Readiness probe (Option A) is specifically designed to determine whether a pod is ready to serve traffic. If the probe fails, the pod is removed from the Service's endpoints, ensuring traffic is only sent to pods that are ready. This directly fulfills the requirement of control…Read full explanation
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