Question 1mediummultiple choice
Full question →- A
RunAs
Why wrong: Not a valid systemd directive.
- B
User
User= specifies the service's user.
- C
Account
Why wrong: Not a valid systemd directive.
- D
UserID
Why wrong: Not a valid systemd directive.
Question 79 of 513
LFCS Service Configuration Practice Question
This LFCS practice question tests your understanding of service configuration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 service is configured to run as a specific user. Which directive in the [Service] section sets the user?
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
✓
User
In systemd service units, the directive to specify the user under which the service process runs is `User=` within the `[Service]` section. This directive sets the Unix user account (by name or UID) that the service's main PID will execute as, ensuring proper privilege separation and security.
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.
- ✗
RunAs
Why it's wrong here
Not a valid systemd directive.
- ✓
User
Why this is correct
User= specifies the service's user.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Account
Why it's wrong here
Not a valid systemd directive.
- ✗
UserID
Why it's wrong here
Not a valid systemd directive.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse systemd's `User=` with the `RunAs` keyword from other operating systems (like Windows services or Solaris) or with generic terms like `Account`, leading them to pick a plausible-sounding but incorrect option.
Detailed technical explanation
How to think about this question
The `User=` directive in systemd leverages the `setuid()` system call to drop privileges from root to the specified user after the service starts. If the service also needs a specific group, `Group=` can be used; if omitted, the user's primary group is used. A subtle behavior is that `User=` does not affect supplementary groups unless `SupplementaryGroups=` is explicitly set, which can lead to unexpected permission issues in real-world scenarios like accessing shared directories.
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.
- →
Service Configuration — study guide chapter
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FAQ
Questions learners often ask
What does this LFCS question test?
Service Configuration — This question tests Service Configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: User — In systemd service units, the directive to specify the user under which the service process runs is `User=` within the `[Service]` section. This directive sets the Unix user account (by name or UID) that the service's main PID will execute as, ensuring proper privilege separation and security.
What should I do if I get this LFCS 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 25, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.
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