LFCS Operation of Running Systems Practice Question
This LFCS practice question tests your understanding of operation of running systems. 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.
Exhibit
Refer to the exhibit.
[Unit]
Description=My Custom Service
After=network.target
[Service]
Type=simple
ExecStart=/usr/local/bin/myapp
Restart=always
RestartSec=5
User=appuser
[Install]
WantedBy=multi-user.target
Based on the exhibit, what happens if the service 'myapp' crashes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
systemd will automatically restart it after 5 seconds
Option B is correct because the systemd service unit for 'myapp' includes the directive `Restart=on-failure` combined with `RestartSec=5`. When the service process crashes or exits with a non-zero status, systemd detects the failure and automatically schedules a restart after the specified 5-second delay. This behavior is defined in the service unit file and is a core feature of systemd's service management.
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 service is disabled and will not start at boot
Why it's wrong here
Restart policy does not affect enablement.
✓
systemd will automatically restart it after 5 seconds
Why this is correct
Restart=always and RestartSec=5 cause automatic restart.
Related concept
Read the scenario before looking for a memorised answer.
✗
The service remains stopped until manually started
Why it's wrong here
Restart=always overrides manual intervention.
✗
An alert is sent to the system administrator
Why it's wrong here
No alerting mechanism is defined in this unit file.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a crashed service must be manually restarted or that systemd only handles boot-time behavior, overlooking the `Restart=` and `RestartSec=` directives that define automatic restart policies for runtime failures.
Detailed technical explanation
How to think about this question
Under the hood, systemd tracks service processes via cgroups and monitors their exit status. The `Restart=` directive supports values like `always`, `on-failure`, `on-abnormal`, and `on-abort`, each triggering restarts under specific conditions. The `RestartSec=` timer uses monotonic clock time, so even if the service fails repeatedly, systemd will respect the delay and apply rate-limiting via `StartLimitIntervalSec` and `StartLimitBurst` to prevent restart loops. In real-world scenarios, a misconfigured `RestartSec` can cause rapid restart storms, overwhelming system resources.
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 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
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.
Operation of Running Systems — This question tests Operation of Running Systems — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: systemd will automatically restart it after 5 seconds — Option B is correct because the systemd service unit for 'myapp' includes the directive `Restart=on-failure` combined with `RestartSec=5`. When the service process crashes or exits with a non-zero status, systemd detects the failure and automatically schedules a restart after the specified 5-second delay. This behavior is defined in the service unit file and is a core feature of systemd's service management.
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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Question Discussion
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