EX188 Container Operations And Lifecycle Practice Question
An administrator is managing rootless containers and needs to understand how user namespaces and security isolation function. Which TWO of the following configuration files or tools are directly relevant to rootless user mapping and systemd user persistence? (Choose TWO)
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
✓
/etc/subuid and /etc/subgid
/etc/subuid defines subordinate UID ranges, and loginctl enable-linger configures user session persistence for systemd user services.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
systemctl system-wide-users
Why it's wrong here
This command is invalid.
- ✗
/etc/containers/rootless.conf
Why it's wrong here
This file is not the standard location for rootless user mappings.
- ✗
/var/lib/podman/subuid.conf
Why it's wrong here
Subordinate UID mappings are configured in system files /etc/subuid and /etc/subgid, not /var/lib/podman/subuid.conf.
- ✓
/etc/subuid and /etc/subgid
Why this is correct
These files define the subordinate UID and GID ranges allocated for rootless user namespaces.
- ✓
loginctl enable-linger
Why this is correct
loginctl enable-linger ensures rootless systemd user instances stay active after logout.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Red Hat exam blueprint
This EX188 practice question is part of Courseiva's free Red Hat 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 EX188 exam.