Debugging a Kubernetes Cluster Part 1
Debugging a Kubernetes cluster can be challenging, but by using systematic approaches and the right tools, you can efficiently diagnose and resolve issues. This guide provides an overview of common debugging methods and tools to help troubleshoot problems in a Kubernetes environment. 1. Understand the Problem Scope Questions to Consider: Is the issue affecting all nodes or a specific pod? Are services unreachable? Is the control plane responding correctly? Are logs indicating specific errors? Identifying the scope helps narrow down the troubleshooting process. 2. Check Cluster Components a. Verify Node Status Check if all nodes are healthy and ready: kubectl get nodes If a node is NotReady, inspect it further: kubectl describe node <node-name> Common issues: Insufficient resources. Network connectivity problems. Crashed kubelet service. Restart kubelet if needed: sudo systemctl restart kubelet b. Inspect Control Plane Components Verify the health of control pla...