StudyToCert

All certifications / CKA / Lessons

Certified Kubernetes Administrator CKA (Kubernetes v1.35 curriculum) · Domain 5: Troubleshooting

Node problems: NotReady, kubelet status and journalctl -u kubelet, kubelet config and certificates, container runtime down, node conditions (DiskPressure, MemoryPressure)

▶ Watch the overview video

Last reviewed September 25, 2026 · Leer en español

Troubleshooting is the largest CKA domain, and a node showing NotReady is a classic task. The node's status is reported by its kubelet, so a NotReady node almost always means the kubelet is stopped, misconfigured, cannot reach the API server, or reports that its runtime or network is not ready.

Free account

Keep reading for free

Create a free StudyToCert account to read the rest of this lesson: 6 more sections, 4 key terms, a real-world example, an exam tip and self-check questions. Every lesson, lab and practice test is free with an account.

Sign up free Log in

Study CKA for free
A week-by-week plan with every lesson, quizzes, checkpoint tests, a practice exam and hands-on labs.
Open the CKA study plan