This CKA practice question tests your understanding of workloads & scheduling. 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.
A developer wants to deploy a pod that will run only once to initialize a database schema. Which Kubernetes resource should they use?
DaemonSet
Why wrong: DaemonSet runs on all nodes.
Job
Job runs a pod to successful completion.
Deployment
Why wrong: Deployment is for continuously running pods.
CronJob
Why wrong: CronJob runs on a schedule, not just once.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Job
A Job is the correct Kubernetes resource for a one-time task that runs to completion, such as initializing a database schema. Unlike controllers that maintain a desired number of replicas, a Job creates one or more Pods and ensures they successfully terminate, making it ideal for batch or initialization workloads.
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.
DaemonSet
Why it's wrong here
DaemonSet runs on all nodes.
Job
Why this is correct
Job runs a pod to successful completion.
Related concept
Read the scenario before looking for a memorised answer.
Deployment
Why it's wrong here
Deployment is for continuously running pods.
CronJob
Why it's wrong here
CronJob runs on a schedule, not just once.
Common exam traps
The trap here is that candidates often confuse a Job with a CronJob, thinking they need scheduling, or with a Deployment, assuming all workloads must be continuously running, when the key differentiator is the 'run to completion' lifecycle.
Detailed technical explanation
Under the hood, a Job creates Pods with a restart policy of 'OnFailure' or 'Never' and tracks their completion status via the .status.succeeded field. If a Pod fails, the Job controller will retry according to the .spec.backoffLimit (default 6), and the Job is considered complete when the specified number of successful completions (.spec.completions, default 1) is reached. A real-world scenario is using a Job to run a database migration script before deploying the main application, ensuring the schema is ready without manual intervention.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Workloads & Scheduling — This question tests Workloads & Scheduling — Read the scenario before looking for a memorised answer..
The correct answer is: Job — A Job is the correct Kubernetes resource for a one-time task that runs to completion, such as initializing a database schema. Unlike controllers that maintain a desired number of replicas, a Job creates one or more Pods and ensures they successfully terminate, making it ideal for batch or initialization workloads.
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 11, 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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