20+ practice questions focused on Operation of Running Systems — one of the most tested topics on the Linux Foundation Certified System Administrator LFCS exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Operation of Running Systems PracticeA system administrator needs to ensure that a specific service, 'myapp', starts automatically after a system crash and also restarts if it fails. Which systemd unit directive should be used to achieve this behavior?
Explanation: Option C is correct because the combination of `Restart=on-failure` ensures the service restarts automatically if it exits with a non-zero exit code or is terminated by a signal, and `WantedBy=multi-user.target` creates a dependency that starts the service at boot, including after a system crash. This satisfies both requirements: automatic start after crash (via systemd's dependency-based boot) and restart on failure (via the Restart directive).
A Linux system reports 'Out of memory' errors frequently. The administrator checks memory usage with 'free -m' and notices that most memory is used by file cache. Which command can the administrator run to immediately free up the cache without affecting running processes?
Explanation: Option C is correct because writing 1 to /proc/sys/vm/drop_caches instructs the kernel to free pagecache (file cache) without terminating any processes. This is a safe, non-destructive operation that reclaims memory used for caching disk I/O, which is exactly what the administrator needs when 'free -m' shows most memory consumed by cache.
An administrator needs to schedule a cron job that runs a script every day at 3:00 AM, but the system is in a different time zone (UTC) than the administrator's local time (EST). The administrator wants the job to run at 3:00 AM local time regardless of system time zone changes. What is the best approach?
Explanation: Option B is correct because the CRON_TZ variable, when set in a crontab file, allows you to specify a time zone for the cron daemon to interpret the schedule entries. This ensures the job runs at 3:00 AM EST regardless of the system's default time zone (UTC), and it persists even if the system time zone changes, as cron uses the variable for scheduling.
Which TWO commands can be used to display the current runlevel or target of a systemd-based system?
Explanation: Option A is correct because `systemctl get-default` directly queries the systemd default target, which is the equivalent of the traditional runlevel in a systemd-based system. This command outputs the target that will be activated at boot, such as `multi-user.target` or `graphical.target`.
Which THREE steps are necessary to permanently disable a systemd service from starting at boot?
Explanation: Option A is correct because `systemctl stop` immediately terminates the service process, which is necessary to ensure the service is not currently running before disabling it from future boots. While stopping alone does not prevent the service from starting at boot, it is a required step in the process of permanently disabling a service, as you must stop the current instance before disabling it to avoid an inconsistent state.
+15 more Operation of Running Systems questions available
Practice all Operation of Running Systems questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Operation of Running Systems. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Operation of Running Systems questions on the LFCS frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Operation of Running Systems is tested as part of the Linux Foundation Certified System Administrator LFCS blueprint. Practicing with targeted Operation of Running Systems questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but Operation of Running Systems is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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