kubeadm Troubleshooting

Overview

Systematic approach to diagnosing kubeadm cluster issues.

Core principle: Trace symptoms to specific components. Most issues are: certificates, networking, or kubelet configuration.

When to Use

• kubeadm init or kubeadm join fails
• Nodes show NotReady status
• Pods stuck in Pending state
• Certificate-related errors
• kubelet crashlooping
• Control plane components failing

Diagnostic Flowchart