Troubleshooting Cluster Components

Your cluster stops responding. kubectl commands hang or return connection errors. Pods aren't scheduling. The fix is almost certainly in a YAML file on the control plane node, but you need to know which file, where to find it, and how to read the logs that tell you what went wrong.

Control plane failures are the highest-stakes troubleshooting scenarios in Kubernetes. Every workload, every service, every scheduling decision depends on four components working correctly: the API server, controller manager, scheduler, and etcd. On the CKA exam, troubleshooting is 30% of the score, and broken control plane components are a recurring theme. This lesson introduces the systematic pattern that applies to every component. Dedicated lessons cover etcd Troubleshooting and Cluster Recovery and API Server, Scheduler, and Controller Manager Debugging in depth.