Quick Answer
The answer is the `--delete-local-data=false` flag. This is correct because `kubectl drain` by default evicts all pods except DaemonSets, and the `--force` flag overrides safeguards that protect pods using emptyDir volumes or local storage; setting `--delete-local-data=false` explicitly instructs the drain to skip evicting pods that rely on local data, preserving the critical application. On the CKA exam, this tests your understanding of drain behavior under maintenance scenarios—a common trap is assuming `--force` alone prevents eviction, when in fact it only bypasses validation checks, leaving pods with local storage vulnerable. Remember that `--force` is a blunt tool, while `--delete-local-data=false` is the targeted shield for stateful pods. A useful mnemonic: “Force is for rules, delete-local-data is for data.”
This CKA practice question tests your understanding of cluster architecture, installation and configuration. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An administrator runs 'kubectl drain node01 --ignore-daemonsets --force' to prepare node01 for maintenance. However, a pod running a critical application is evicted and becomes unschedulable. Which flag could prevent eviction of that specific pod?
--grace-period=0
Why wrong: --grace-period sets the period for pod termination, not whether to evict.
--pod-selector='app=critical'
Why wrong: --pod-selector is not a valid flag for kubectl drain.
--delete-local-data=false
Setting --delete-local-data=false prevents eviction of pods with local storage, protecting critical pods that use local data.
--evict-unscheduled-pods
Why wrong: --evict-unscheduled-pods is not a valid flag.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
--delete-local-data=false
Option C is correct because the `--delete-local-data=false` flag prevents the eviction of pods that use emptyDir volumes or local data. By default, `kubectl drain` evicts all pods except those managed by DaemonSets, and the `--force` flag bypasses checks that would normally protect pods with local storage. Setting this flag to false ensures that pods with local data (like the critical application) are not evicted during the drain operation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
--grace-period=0
Why it's wrong here
--grace-period sets the period for pod termination, not whether to evict.
--pod-selector='app=critical'
Why it's wrong here
--pod-selector is not a valid flag for kubectl drain.
--delete-local-data=false
Why this is correct
Setting --delete-local-data=false prevents eviction of pods with local storage, protecting critical pods that use local data.
Related concept
Read the scenario before looking for a memorised answer.
--evict-unscheduled-pods
Why it's wrong here
--evict-unscheduled-pods is not a valid flag.
Common exam traps
The trap here is that candidates often confuse `--delete-local-data` with a flag that deletes data on the node, when in fact it controls whether pods using local storage (like emptyDir) are evicted, and the default behavior with `--force` is to evict them.
Detailed technical explanation
The `kubectl drain` command works by first marking the node as unschedulable (via `kubectl cordon`) and then evicting pods using the Eviction API, which respects PodDisruptionBudgets (PDBs) unless `--force` is used. The `--delete-local-data` flag defaults to true when `--force` is used, meaning pods with emptyDir volumes are evicted; setting it to false overrides this behavior, preserving those pods. In real-world scenarios, critical applications often use emptyDir for temporary storage or caching, and this flag is essential to avoid data loss or service disruption during node maintenance.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CKA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: --delete-local-data=false — Option C is correct because the `--delete-local-data=false` flag prevents the eviction of pods that use emptyDir volumes or local data. By default, `kubectl drain` evicts all pods except those managed by DaemonSets, and the `--force` flag bypasses checks that would normally protect pods with local storage. Setting this flag to false ensures that pods with local data (like the critical application) are not evicted during the drain operation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This CKA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CKA exam.
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