KCNA Container Orchestration Practice Question
A pod is in the 'Pending' state. Which of the following is a likely cause?
⚠ Common exam trap
CNCF often tests the distinction between pod scheduling failures (Pending) and runtime failures (CrashLoopBackOff, OOMKilled, ImagePullBackOff), tempting candidates to confuse post-scheduling errors with pre-scheduling conditions.
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
✓
No node has sufficient resources to run the pod
A pod enters the 'Pending' state when it has been accepted by the API server but cannot be scheduled onto a node. The most common cause is insufficient cluster resources (CPU, memory, or ephemeral storage) on any available node to satisfy the pod's resource requests. The Kubernetes scheduler continuously evaluates node resource availability and will leave the pod in Pending until a suitable node is found or the request times out.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The liveness probe is failing
Why it's wrong here
Liveness probe failure causes the container to restart, not a Pending state.
- ✗
The container image is not found in the registry
Why it's wrong here
Image not found results in ImagePullBackOff, not Pending.
- ✓
No node has sufficient resources to run the pod
Why this is correct
Insufficient resources cause the scheduler to keep the pod Pending.
- ✗
The container exited with OOMKilled
Why it's wrong here
OOMKilled leads to CrashLoopBackOff, not Pending.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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