How to solve the problem when all pods are running, but the service does not respond?

If all pods are running but the service is not responding, it is worth checking a few things:

• Check pod logs: the application inside the pod might be crashing or hanging.
• Check the status of pods and containers: ensure that containers are actually running and not restarting.
• Check the service configuration: verify that the selectors are correctly set so that the service directs traffic to the right pods.
• Check network policies and firewall: traffic might be blocked.
• Check readiness and liveness probes: if the readiness probe fails, the service will not route traffic to the pod.

For example, a command to view logs:

kubectl logs <pod-name>

And to check services:

kubectl describe svc <service-name>

Thus, the problem is most often related to incorrect configuration or the state of the application inside the pods, rather than the pods' startup itself.