LFCS Operation of Running Systems Practice Question
This LFCS practice question tests your understanding of operation of running systems. 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.
An administrator is investigating why the 'tomcat' service fails to start on a RHEL 8 server. The output of 'systemctl status tomcat' shows: 'Loaded: loaded (/etc/systemd/system/tomcat.service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since ... Process: 4567 ExecStart=/opt/tomcat/bin/startup.sh (code=exited, status=1/FAILURE)'. The 'journalctl -u tomcat' shows: 'Error: JAVA_HOME is not defined correctly, cannot execute /usr/lib/jvm/java-11-openjdk/bin/java'. The admin checks /opt/tomcat/bin/startup.sh and sees it references JAVA_HOME. The admin verifies that Java 11 is installed at /usr/lib/jvm/java-11-openjdk. Which action should the admin take to fix the service?
Edit /opt/tomcat/bin/startup.sh and hardcode JAVA_HOME.
Why wrong: Works but not best practice; service changes lost on updates.
B
Add 'Environment=JAVA_HOME=/usr/lib/jvm/java-11-openjdk' to the [Service] section of /etc/systemd/system/tomcat.service and run 'systemctl daemon-reload && systemctl restart tomcat'.
Properly passes environment to service.
C
Run the startup script manually with 'bash /opt/tomcat/bin/startup.sh'.
Why wrong: May work but not persistent for systemd.
D
Set JAVA_HOME globally using 'export JAVA_HOME=/usr/lib/jvm/java-11-openjdk' in /etc/profile.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add 'Environment=JAVA_HOME=/usr/lib/jvm/java-11-openjdk' to the [Service] section of /etc/systemd/system/tomcat.service and run 'systemctl daemon-reload && systemctl restart tomcat'.
Option B is correct because systemd services can have environment variables set via the `Environment=` directive in the unit file. Adding `JAVA_HOME=/usr/lib/jvm/java-11-openjdk` to the `[Service]` section ensures the variable is available to the `ExecStart` process. Running `systemctl daemon-reload` reloads the unit definition, and `systemctl restart tomcat` applies the change. This is the proper method for configuring environment variables for systemd-managed services on RHEL 8.
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.
✗
Edit /opt/tomcat/bin/startup.sh and hardcode JAVA_HOME.
Why it's wrong here
Works but not best practice; service changes lost on updates.
✓
Add 'Environment=JAVA_HOME=/usr/lib/jvm/java-11-openjdk' to the [Service] section of /etc/systemd/system/tomcat.service and run 'systemctl daemon-reload && systemctl restart tomcat'.
Why this is correct
Properly passes environment to service.
Related concept
Read the scenario before looking for a memorised answer.
✗
Run the startup script manually with 'bash /opt/tomcat/bin/startup.sh'.
Why it's wrong here
May work but not persistent for systemd.
✗
Set JAVA_HOME globally using 'export JAVA_HOME=/usr/lib/jvm/java-11-openjdk' in /etc/profile.
Why it's wrong here
Not read by systemd services.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume setting environment variables in shell profile files (like `/etc/profile`) will affect systemd services, but systemd does not source these files; the correct method is to use the `Environment=` directive in the unit file.
Detailed technical explanation
How to think about this question
Systemd services run in a clean environment by default, inheriting only variables explicitly set via `Environment=` or `EnvironmentFile=` directives. The `JAVA_HOME` variable is critical for Java applications like Tomcat, and its absence is a common cause of startup failures. Using `Environment=` in the unit file is the recommended practice because it isolates the service configuration and survives service restarts without relying on shell profiles.
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: Add 'Environment=JAVA_HOME=/usr/lib/jvm/java-11-openjdk' to the [Service] section of /etc/systemd/system/tomcat.service and run 'systemctl daemon-reload && systemctl restart tomcat'. — Option B is correct because systemd services can have environment variables set via the `Environment=` directive in the unit file. Adding `JAVA_HOME=/usr/lib/jvm/java-11-openjdk` to the `[Service]` section ensures the variable is available to the `ExecStart` process. Running `systemctl daemon-reload` reloads the unit definition, and `systemctl restart tomcat` applies the change. This is the proper method for configuring environment variables for systemd-managed services on RHEL 8.
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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