The answer is `spec.serviceAccountName`. Setting this field to 'my-sa' in the pod spec automatically mounts the service account token as a projected volume at `/var/run/secrets/kubernetes.io/serviceaccount/`, because Kubernetes treats the service account name as the primary directive for token injection and mounts the associated secret without any additional volume configuration. On the Certified Kubernetes Administrator CKA exam, this tests your understanding of pod identity and default behavior—a common trap is assuming you must manually define a volume or use `automountServiceAccountToken`, but the simplest and most direct method is simply assigning the service account name. Remember that `spec.serviceAccountName` is the declarative link; Kubernetes handles the rest automatically, including token rotation. A helpful memory tip: "Name it, and it mounts—no extra steps."
CKA Practice Question: Cluster Architecture, Installation and Configuration
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.
You have a service account named 'my-sa' in the 'default' namespace. You want to mount its token into a pod automatically. Which field in the pod spec achieves this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
spec.serviceAccountName
Option A is correct because setting `spec.serviceAccountName` to 'my-sa' in the pod spec automatically mounts the service account token as a volume at `/var/run/secrets/kubernetes.io/serviceaccount/`. This is the standard way to associate a service account with a pod, and Kubernetes automatically handles token projection and mounting for that service account.
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.
✓
spec.serviceAccountName
Why this is correct
Setting this field to 'my-sa' will use that service account and automatically mount its token.
Related concept
Read the scenario before looking for a memorised answer.
✗
spec.serviceAccount
Why it's wrong here
This field is deprecated; the correct field is 'serviceAccountName'.
✗
spec.containers[].env[].valueFrom.secretKeyRef
Why it's wrong here
This is for injecting environment variables from secrets, not for mounting service account tokens.
✗
spec.automountServiceAccountToken
Why it's wrong here
This is a boolean to control mounting, but it doesn't specify which service account to use.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `spec.serviceAccountName` with the deprecated `spec.serviceAccount` field, or think that `spec.automountServiceAccountToken` alone is sufficient to mount a specific service account's token, when it only controls the mounting behavior for the default service account.
Detailed technical explanation
How to think about this question
Under the hood, when `spec.serviceAccountName` is set, the kubelet mounts a projected volume containing the service account token (a JWT), the CA certificate, and a namespace file. In Kubernetes 1.24+, the token is automatically generated and mounted as a projected volume with a time-bound token (using TokenRequest API), improving security over the older static secret-based tokens. A real-world scenario is when a pod needs to authenticate to the Kubernetes API server or an external system using a specific service account identity, such as in CI/CD pipelines or monitoring agents.
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 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CKA question in full detail.
Cluster Architecture, Installation and Configuration — This question tests Cluster Architecture, Installation and Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: spec.serviceAccountName — Option A is correct because setting `spec.serviceAccountName` to 'my-sa' in the pod spec automatically mounts the service account token as a volume at `/var/run/secrets/kubernetes.io/serviceaccount/`. This is the standard way to associate a service account with a pod, and Kubernetes automatically handles token projection and mounting for that service account.
What should I do if I get this CKA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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