CKATroubleshootingMedium
Worker NotReady: kubelet stopped
A worker node reports NotReady; diagnose and restore it without recreating the node.
Two nodes · ~7 min · 7 points
- troubleshooting
- node
- kubelet
- notready
goldenkube start cka-trb-001
Hands-on Kubernetes labs
Exam-style tasks for the performance-based certifications, run on a real kubeadm cluster on your own Mac with the GoldenKube CLI and graded locally. Each card shows the task's domain, the cluster topology it needs, the recommended time and its points; the detail page has the full task text.
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CKATroubleshootingMedium
Worker NotReady: kubelet fails to start
The kubelet on a worker refuses to start; find the misconfiguration and fix it on the node.
Two nodes · ~8 min · 7 points
- troubleshooting
- node
- kubelet
- systemd
- configuration
goldenkube start cka-trb-002
CKATroubleshootingHard
kube-apiserver static pod broken
kubectl cannot reach the cluster; repair the API server from the control plane node.
Single node · ~8 min · 8 points
- troubleshooting
- kube-apiserver
- static-pod
- control-plane
- crictl
goldenkube start cka-trb-003
CKATroubleshootingMedium
Worker NotReady: container runtime down
A worker is NotReady although its kubelet runs; find the underlying runtime problem and fix it.
Two nodes · ~6 min · 6 points
- troubleshooting
- node
- containerd
- cri
- kubelet
goldenkube start cka-trb-004
CKATroubleshootingEasy
Cluster DNS down
Service name resolution has stopped working; investigate and restore the cluster DNS component.
Two nodes · ~5 min · 5 points
- troubleshooting
- coredns
- dns
- kube-system
goldenkube start cka-trb-005
CKATroubleshootingMedium
Service with no endpoints
A Service forwards nowhere; find the mismatch and fix the Service only.
Two nodes · ~6 min · 6 points
- troubleshooting
- service
- selector
- endpoints
goldenkube start cka-trb-006
CKATroubleshootingMedium
Pods Pending on a cordoned node
A Deployment pinned to one node cannot schedule; find the node-level cause and fix it.
Two nodes · ~5 min · 6 points
- troubleshooting
- scheduling
- cordon
- pending
- nodeselector
goldenkube start cka-trb-007
CKATroubleshootingMedium
CrashLoopBackOff: container command exits
A Deployment's containers keep exiting; find out why and make them stay running.
Single node · ~6 min · 6 points
- troubleshooting
- crashloopbackoff
- deployment
- logs
goldenkube start cka-trb-008
CKATroubleshootingEasy
ImagePullBackOff: wrong image tag
A Deployment's pods cannot pull their image; correct the image and get the replicas Ready.
Single node · ~5 min · 5 points
- troubleshooting
- imagepullbackoff
- deployment
- image
goldenkube start cka-trb-009
Exams covered
- CKA · Certified Kubernetes Administrator · scenarios verified on Kubernetes 1.37 · 37 published scenarios · mock exam: 15 tasks in 120 minutes, pass at 66%
How to run a lab
- Install the CLI and Multipass, then run
goldenkube doctor. - Sign in with
goldenkube login(free account). - Start a scenario with its id, solve the task on the cluster, run
goldenkube submit.
Grading happens on your machine and is practice feedback, not an official score. Tasks are public; hints, reference solutions and grader internals are not.