- A
The container must be run with the '--privileged' flag.
Why wrong: '--privileged' is incompatible with rootless mode.
- B
The user must have entries in /etc/subuid and /etc/subgid for user namespace mapping.
Subuid/subgid mappings are required for rootless containers to allocate UIDs/GIDs.
- C
The system must have cgroups v2 enabled.
Why wrong: cgroups v2 is not required for rootless containers, though it is beneficial.
- D
The user must have root privileges to run the container.
Why wrong: Rootless containers run as the unprivileged user.
Question 34 of 537
What Is Needed for Rootless Podman: /etc/subuid and /etc/subgid
This EX200 practice question tests your understanding of manage containers. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 system administrator wants to run a container that uses the rootless mode available in Podman. Which requirement must be met for rootless containers to work correctly?
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
✓
The user must have entries in /etc/subuid and /etc/subgid for user namespace mapping.
Rootless Podman containers require user namespace mapping to assign subordinate UIDs and GIDs from the host to the container. Without entries in /etc/subuid and /etc/subgid for the user, Podman cannot allocate the necessary ID ranges, and the container will fail to run in rootless mode.
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.
- ✗
The container must be run with the '--privileged' flag.
Why it's wrong here
'--privileged' is incompatible with rootless mode.
- ✓
The user must have entries in /etc/subuid and /etc/subgid for user namespace mapping.
Why this is correct
Subuid/subgid mappings are required for rootless containers to allocate UIDs/GIDs.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The system must have cgroups v2 enabled.
Why it's wrong here
cgroups v2 is not required for rootless containers, though it is beneficial.
- ✗
The user must have root privileges to run the container.
Why it's wrong here
Rootless containers run as the unprivileged user.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Red Hat often tests the misconception that rootless containers require root privileges or special flags like '--privileged', when in fact they rely on user namespace mapping configured in /etc/subuid and /etc/subgid.
Detailed technical explanation
How to think about this question
The /etc/subuid and /etc/subgid files define subordinate ID ranges (e.g., 'user:100000:65536') that Podman uses with the newuidmap and newgidmap helpers to map container UIDs/GIDs to unprivileged host ranges. This mapping is essential for rootless containers to write files to host volumes without ownership conflicts, as the kernel enforces that only mapped IDs can access the container's filesystem. In practice, a user without these entries will see an error like 'cannot find UID/GID for user' when attempting to run a rootless container.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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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Manage containers — study guide chapter
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FAQ
Questions learners often ask
What does this EX200 question test?
Manage containers — This question tests Manage containers — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The user must have entries in /etc/subuid and /etc/subgid for user namespace mapping. — Rootless Podman containers require user namespace mapping to assign subordinate UIDs and GIDs from the host to the container. Without entries in /etc/subuid and /etc/subgid for the user, Podman cannot allocate the necessary ID ranges, and the container will fail to run in rootless mode.
What should I do if I get this EX200 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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Last reviewed: Jun 30, 2026
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