Question 725 of 997

Kubernetes Fundamentals →mediumMultiple ChoiceObjective-mapped

Scale a Deployment with kubectl scale

This KCNA practice question tests your understanding of kubernetes fundamentals. 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 user runs 'kubectl create deployment my-deploy --image=nginx' and then wants to scale the deployment to 5 replicas. Which command should they use?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.

A
kubectl apply -f deployment.yaml with replicas: 5
Why wrong: This works if you have a YAML file, but no file was provided.
B
kubectl edit deployment my-deploy and change replicas to 5
Why wrong: This works but is not the most straightforward command.
C
kubectl patch deployment my-deploy -p '{"spec":{"replicas":5}}'
Why wrong: This also works but scale is simpler.
D
kubectl scale deployment my-deploy --replicas=5
Correct command.

Full breakdown with real-world context →

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 scale deployment my-deploy --replicas=5

Option D is correct because `kubectl scale` is the dedicated imperative command to change the replica count of a deployment. It directly updates the `spec.replicas` field in the deployment's desired state, and the deployment controller then adjusts the ReplicaSet and Pods accordingly. This is the simplest and most direct way to scale a deployment without modifying a YAML file or using an editor.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 apply -f deployment.yaml with replicas: 5
Why it's wrong here
This works if you have a YAML file, but no file was provided.
✗
kubectl edit deployment my-deploy and change replicas to 5
Why it's wrong here
This works but is not the most straightforward command.
✗
kubectl patch deployment my-deploy -p '{"spec":{"replicas":5}}'
Why it's wrong here
This also works but scale is simpler.
✓
kubectl scale deployment my-deploy --replicas=5
Why this is correct
Correct command.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap is that candidates may think `kubectl edit` or `kubectl patch` are the only ways to change replicas, but the KCNA exam expects knowledge of the dedicated imperative `kubectl scale` command for direct scaling operations.

Trap categories for this question

Command / output trap
This works but is not the most straightforward command.

Detailed technical explanation

How to think about this question

Under the hood, `kubectl scale` sends a PATCH request to the Kubernetes API server to update the `spec.replicas` field of the Deployment object. The Deployment controller then reconciles the current state by creating or deleting ReplicaSets and Pods to match the desired replica count. In real-world scenarios, `kubectl scale` is often used in CI/CD pipelines or autoscaling scripts because it is idempotent and works without needing to manage YAML files.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.

TExam Day Tips

Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the KCNA 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

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this KCNA question test?

Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: kubectl scale deployment my-deploy --replicas=5 — Option D is correct because `kubectl scale` is the dedicated imperative command to change the replica count of a deployment. It directly updates the `spec.replicas` field in the deployment's desired state, and the deployment controller then adjusts the ReplicaSet and Pods accordingly. This is the simplest and most direct way to scale a deployment without modifying a YAML file or using an editor.

What should I do if I get this KCNA question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

Are there clue words in this question I should notice?

Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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