The answer is to run journalctl -u myapp.service to inspect the service logs. This is the best first step because when a systemd service fails with an exit code, it means the process terminated abnormally, and the systemd journal captures the service’s stdout, stderr, and any specific error messages from that failed startup attempt. On the CompTIA Linux+ XK0-005 exam, this question tests your understanding of systemd diagnostic workflow—many candidates mistakenly check the service file syntax or run systemctl status again, but the journal is the direct source for exit-code failures. A common trap is forgetting the -u flag, which filters all system messages to just that unit. Remember the mnemonic: “Failed exit code? Journal -u is the first go-to.”
XK0-005 Troubleshooting Practice Question
This XK0-005 practice question tests your understanding of troubleshooting. 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 notices that a service named 'myapp' fails to start on a Linux server. The command 'systemctl status myapp' shows 'Active: failed (Result: exit-code)'. Which of the following is the BEST first step to diagnose the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run 'journalctl -u myapp.service' to inspect the service logs.
The 'journalctl -u myapp.service' command retrieves the systemd journal logs specifically for the myapp service, which contain the service's stdout, stderr, and any error messages generated during its failed startup attempt. Since the service failed with an exit code, these logs are the most direct source of diagnostic information to identify why the process terminated abnormally.
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.
✓
Run 'journalctl -u myapp.service' to inspect the service logs.
Why this is correct
journalctl with the unit flag shows logs for that specific service, revealing startup errors.
Clue confirmation
The clue words "best", "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Run 'dmesg' to view kernel messages.
Why it's wrong here
dmesg shows kernel messages, not service-specific errors.
✗
Run 'ps aux | grep myapp' to check if the process is running.
Why it's wrong here
This only checks if the process is present, not why it failed to start.
✗
Edit the service file with 'systemctl edit myapp' and increase timeout values.
Why it's wrong here
Modifying configuration without knowing the cause can introduce new issues.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often jump to checking running processes with 'ps' or kernel messages with 'dmesg', but the correct first step is always to consult the service-specific logs via 'journalctl' because systemd captures the exact failure reason from the service's own output.
Trap categories for this question
Command / output trap
dmesg shows kernel messages, not service-specific errors.
Detailed technical explanation
How to think about this question
Systemd services log their output to the journal by default, and 'journalctl -u myapp.service' queries the binary journal files under /var/log/journal/ (or /run/log/journal/ if persistent storage is disabled). The exit-code result indicates the main process terminated with a non-zero exit status, which systemd captures and reports; the journal will contain the exact error message, such as 'ExecStart=/usr/bin/myapp failed with exit code 1', along with any stderr output that can pinpoint missing dependencies, configuration errors, or permission issues.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run 'journalctl -u myapp.service' to inspect the service logs. — The 'journalctl -u myapp.service' command retrieves the systemd journal logs specifically for the myapp service, which contain the service's stdout, stderr, and any error messages generated during its failed startup attempt. Since the service failed with an exit code, these logs are the most direct source of diagnostic information to identify why the process terminated abnormally.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best", "first". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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