This LFCS practice question tests your understanding of service configuration. 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 service named webserver.service is failing to start. The administrator wants to see the most recent error messages related to this service. Which command provides this information?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
journalctl -u webserver.service
Shows logs for the unit, including recent errors.
systemctl status webserver.service --full
Why wrong: Shows status but may not display full logs.
systemctl list-units --type=service | grep webserver
Why wrong: Lists units but does not show error messages.
systemctl is-active webserver.service
Why wrong: Only returns active/inactive state.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
journalctl -u webserver.service
The `journalctl -u webserver.service` command queries the systemd journal for all log entries associated with the specified unit, showing the most recent error messages in reverse chronological order. This is the standard way to view detailed, time-stamped error logs for a failing service, as `journalctl` provides access to the binary journal that captures stdout, stderr, and syslog messages from the service.
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.
journalctl -u webserver.service
Why this is correct
Shows logs for the unit, including recent errors.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
systemctl status webserver.service --full
Why it's wrong here
Shows status but may not display full logs.
systemctl list-units --type=service | grep webserver
Why it's wrong here
Lists units but does not show error messages.
systemctl is-active webserver.service
Why it's wrong here
Only returns active/inactive state.
Common exam traps
The trap here is that candidates confuse `systemctl status` (which shows a brief log snippet) with `journalctl -u` (which provides the full, searchable journal), assuming the status command gives complete error history when it only shows a truncated view.
Trap categories for this question
Command / output trap
Shows status but may not display full logs.
Detailed technical explanation
The systemd journal (`journald`) stores structured, binary log data with fields like `_SYSTEMD_UNIT`, `PRIORITY`, and `MESSAGE`, allowing precise filtering with `journalctl -u`. The `-u` flag matches the `_SYSTEMD_UNIT` field, so even if the service outputs to stdout/stderr via its unit file's `StandardOutput=journal` (default), those messages are captured. In real-world troubleshooting, you might combine `-u` with `-p err` to show only error-level messages or `--since` to narrow the time window.
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 LFCS 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
Service Configuration — This question tests Service Configuration — Read the scenario before looking for a memorised answer..
The correct answer is: journalctl -u webserver.service — The `journalctl -u webserver.service` command queries the systemd journal for all log entries associated with the specified unit, showing the most recent error messages in reverse chronological order. This is the standard way to view detailed, time-stamped error logs for a failing service, as `journalctl` provides access to the binary journal that captures stdout, stderr, and syslog messages from the service.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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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