Question 332 of 866
CKS Minimize Microservice Vulnerabilities Practice Question
A pod fails to start with the error 'Container runtime network not ready', and the node uses Kata Containers (RuntimeClass: kata). What is the most likely cause?
⚠ Common exam trap
Candidates often overlook the need for RuntimeClass-specific CNI configuration when using Kata Containers, assuming that the network error is always due to a cluster-wide CNI issue.
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
✓
The CNI plugin is not configured correctly for the kata RuntimeClass
Kata Containers use lightweight VMs for pod isolation, which require a separate CNI plugin (e.g., flannel, calico) to be configured specifically for the kata RuntimeClass. The error 'Container runtime network not ready' indicates that the CNI plugin is either missing, misconfigured, or not compatible with the kata runtime, preventing the pod's network namespace from being set up.
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 node has insufficient memory
Why it's wrong here
Insufficient memory would cause OOM, not a network error.
- ✗
The pod is trying to mount a hostPath volume
Why it's wrong here
HostPath mounts are supported by Kata, though with some restrictions.
- ✓
The CNI plugin is not configured correctly for the kata RuntimeClass
Why this is correct
Kata requires specific CNI configuration; misconfiguration leads to network not ready.
- ✗
The pod's securityContext sets runAsNonRoot: true
Why it's wrong here
runAsNonRoot does not affect network readiness.
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Last reviewed: Jul 4, 2026
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