CKA Troubleshooting Practice Question
Which TWO of the following are valid commands to check resource usage of pods?
⚠ Common exam trap
Many exam-takers confuse `kubectl describe pods` (which shows resource requests/limits) with actual resource usage, or they mistakenly think `kubectl get pods --watch` provides real-time performance metrics instead of status changes.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
kubectl top pod <pod-name>
Option C, `kubectl top pod <pod-name>`, is correct because the `kubectl top` command retrieves live CPU and memory usage metrics for a specific pod from the Metrics Server, which is exactly what checking resource usage of a pod requires. Option E, `kubectl top pods`, is also correct because it lists current CPU and memory consumption for all pods in the namespace, directly satisfying the resource-usage check. Option A, `kubectl top nodes`, is not correct here because it reports resource usage of cluster nodes, not pods. Option B, `kubectl describe pods`, shows configuration, events, and status details but not live CPU/memory usage metrics. Option D, `kubectl get pods --watch`, only streams pod status changes and does not report resource consumption.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
kubectl top nodes
Why it's wrong here
kubectl top nodes is invalid for checking pod resource consumption because it aggregates CPU and memory utilization at the node level, presenting the combined usage of all pods running on each node. This command helps with cluster-wide capacity planning but obscures per-pod breakdown, making it impossible to identify which individual pod is consuming excessive resources without further cross-referencing.
- ✗
kubectl describe pods
Why it's wrong here
kubectl describe pods is not intended for real-time resource usage monitoring; it outputs detailed metadata such as labels, annotations, pod status, container images, and event history. While it includes configured resource requests and limits, it does not expose actual CPU or memory utilization, so it cannot answer whether a pod is exceeding its allocated resources.
- ✓
kubectl top pod <pod-name>
Why this is correct
kubectl top pod <pod-name> is a valid command that queries the Metrics API (backed by metrics-server) to display real-time CPU and memory usage for the specific named pod. It reports usage in cores and MiB (or GiB) for each container, making it the precise tool for troubleshooting a single pod's resource consumption against its requests/limits.
- ✗
kubectl get pods --watch
Why it's wrong here
kubectl get pods --watch is incorrect because it streams pod lifecycle changes, such as phase transitions (Pending, Running, Succeeded) and restart events, but does not collect or display resource utilization metrics. The watch flag merely keeps the command running and prints updates on status changes, not on CPU or memory usage.
- ✓
kubectl top pods
Why this is correct
kubectl top pods is a valid command that shows CPU and memory usage for all pods in the current namespace (or all namespaces with the -A flag), aggregated per pod. It leverages the same Metrics API as kubectl top pod but provides a wider view, making it useful for comparing resource consumption across multiple pods at once.
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