This CKAD practice question tests your understanding of application environment, configuration and security. 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 creates a pod with the following YAML snippet:
securityContext: runAsUser: 1000 runAsGroup: 3000 fsGroup: 2000
The pod mounts an emptyDir volume. What is the owner and group of the mounted directory inside the container?
Owner: 1000, Group: 3000
Why wrong: The group is set by fsGroup, not runAsGroup, for mounted volumes.
Owner: 1000, Group: 1000
Why wrong: fsGroup overrides the default group for volumes.
Owner: 1000, Group: 2000
The volume's group is set to fsGroup (2000), and the owner is the runAsUser (1000).
Owner: 0, Group: 2000
Why wrong: The owner is set by runAsUser, not root.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Owner: 1000, Group: 2000
Option C is correct because when a pod specifies `fsGroup: 2000`, Kubernetes recursively changes the group ownership of any volume mounted into the pod (including emptyDir) to that GID (2000). The `runAsUser: 1000` sets the container process's UID, but the volume's group ownership is overridden by `fsGroup`. Thus, the mounted emptyDir directory is owned by UID 1000 (the process user) and GID 2000 (the fsGroup).
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.
Owner: 1000, Group: 3000
Why it's wrong here
The group is set by fsGroup, not runAsGroup, for mounted volumes.
Owner: 1000, Group: 1000
Why it's wrong here
fsGroup overrides the default group for volumes.
Owner: 1000, Group: 2000
Why this is correct
The volume's group is set to fsGroup (2000), and the owner is the runAsUser (1000).
Related concept
Read the scenario before looking for a memorised answer.
Owner: 0, Group: 2000
Why it's wrong here
The owner is set by runAsUser, not root.
Common exam traps
The trap here is that candidates confuse `runAsGroup` (which sets the primary GID of the container process) with `fsGroup` (which sets the group ownership of mounted volumes), leading them to pick Option A or B instead of recognizing that `fsGroup` overrides the volume's group.
Detailed technical explanation
Under the hood, when `fsGroup` is set, the kubelet's volume manager calls `chown` and `chmod` on the volume's root directory to set ownership to the `runAsUser` and `fsGroup`, and applies a setgid bit so that new files inherit the group. This behavior is defined in the Kubernetes Pod SecurityContext and is critical for shared volumes in stateful workloads (e.g., databases) where multiple containers must write to the same volume with consistent group permissions. Note that `fsGroup` only affects volumes that support ownership management (e.g., emptyDir, hostPath, persistent volumes), not all volume types.
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 CKAD 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
Application Environment, Configuration and Security — This question tests Application Environment, Configuration and Security — Read the scenario before looking for a memorised answer..
The correct answer is: Owner: 1000, Group: 2000 — Option C is correct because when a pod specifies `fsGroup: 2000`, Kubernetes recursively changes the group ownership of any volume mounted into the pod (including emptyDir) to that GID (2000). The `runAsUser: 1000` sets the container process's UID, but the volume's group ownership is overridden by `fsGroup`. Thus, the mounted emptyDir directory is owned by UID 1000 (the process user) and GID 2000 (the fsGroup).
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 25, 2026
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