LFCS Service Configuration Practice Question
A Linux administrator is troubleshooting a custom systemd service named data-sync.service that repeatedly fails with the error 'start request repeated too quickly'. The unit file has Restart=always and RestartSec=5. Which command should the administrator use to reset the failed state and clear the restart counter so the service can be started again?
⚠ Common exam trap
The trap here is assuming that restarting the service will automatically clear the failure after the restart delay, but systemd maintains a persistent start counter that must be explicitly reset.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
systemctl reset-failed data-sync.service
When a systemd service is configured with Restart=always and crashes repeatedly, systemd enforces a start limit (default 5 starts in 10 seconds) and then refuses further starts with the error 'start request repeated too quickly'. To recover, the administrator must clear the failed state and restart counter using systemctl reset-failed, after which the service can be started normally. This command is specifically designed for this purpose and is the correct tool for the scenario.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
systemctl reset-failed data-sync.service
Why this is correct
This command resets the failed state of the unit and clears the restart counter maintained by systemd. When a service hits the start limit (default: 5 starts within 10 seconds), systemd refuses further starts until the counter is reset. After running this, the administrator can successfully start the service again with systemctl start.
- ✗
systemctl daemon-reload
Why it's wrong here
This command reloads systemd's manager configuration and unit files after they have been modified on disk. It does not clear the failed state or restart counter of a service. While daemon-reload is necessary after editing a unit file, it will not resolve the 'start request repeated too quickly' error in this scenario.
- ✗
systemctl restart data-sync.service
Why it's wrong here
This command attempts to stop and then start the service. However, because the service is in a failed state due to hitting the start limit, systemd will reject the start request and return an error. The restart counter must be reset before the service can be started again, so this command alone will not work.
- ✗
systemctl kill data-sync.service
Why it's wrong here
This command sends a signal to the service's processes, but since the service is not running (it failed to start), there are no processes to kill. It does not reset the failed state or clear the restart counter. This command is used to stop a running service forcefully, not to recover from a start limit failure.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Linux Foundation exam blueprint
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.