Guides
Troubleshooting playbooks, CKA/CKAD exam prep, and scenario-based practice for kubectl decisions under pressure.
17 articles
Pending doesn’t mean your app is starting — it means the scheduler can’t place the Pod on any Node (yet). Here’s how to diagnose it fast.
Read articleCKAD rewards fast, correct workload debugging — probes, rollouts, Services, ConfigMaps, and Jobs. A practical study plan without drowning in cluster internals.
Read articleCKA is about nodes, control plane health, networking, storage, and etcd — under a 2-hour clock. A practical prep plan for administrators, not app developers.
Read articleCrashLoopBackOff is not the problem — it’s Kubernetes telling you your container keeps dying and it’s trying to bring it back. Over and over.
Read articleIf a Pod is stuck in ContainerCreating, it’s already scheduled — Kubernetes is waiting on prerequisites like volumes, CNI, or image pulls. Here’s how to pinpoint the blocker.
Read articleSame exam format, different job lens — application developer vs cluster administrator. How to choose, and what each exam rewards under time pressure.
Read articleYou set a 4 CPU limit but the pod stays Pending — limits do not reserve capacity. How requests, limits, and QoS affect scheduling and eviction.
Read articleError from server (Forbidden) means Kubernetes enforced a rule — use auth can-i, then fix RoleBindings instead of reaching for cluster-admin.
Read articlenslookup fails inside pods but apps look fine? Cluster DNS is a platform service — check kube-system before you restart application Deployments.
Read articlecurl times out but pods look Running? An empty Endpoints list means the Service selector does not match any Ready pod — trace the chain before blaming the network.
Read articleProgress deadline exceeded, old pods never terminate, new ReplicaSet at zero — a calm order of operations before rollback or delete.
Read articlePods are Running, Service has Endpoints, but nothing connects — a default-deny NetworkPolicy may block traffic with no obvious pod error.
Read articleErrImagePull and ImagePullBackOff mean the kubelet never got your container image — not that your app crashed. How to diagnose tag, registry, and secret issues fast.
Read articleThe hardest part of troubleshooting is not knowing commands — it is picking the right one first. A simple decision tree for Pod status under pressure.
Read articleCKA and CKAD reward the next sensible step under pressure — not isolated syntax. Short, repeated scenario sessions beat a last-minute command list.
Read articleCKA, CKAD, and CKS are performance tests — not trivia. What examiners reward, common prep mistakes, and how scenario practice fits in.
Read articleStart with get, describe, logs, exec, and apply — then practice choosing the right one first in realistic scenarios, not just memorizing syntax.
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