hardMultiple ChoiceObjective-mapped
XK0-006 Practice Question: A systemd timer unit is configured to run a…
A systemd timer unit is configured to run a service every hour but the service never executes. The timer shows as active and enabled. Which of the following is the most likely cause?
⚠ Common exam trap
A common mix-up: candidates confuse 'masked' with 'disabled' or assume a timer will still start a disabled service, but systemd will not start a masked service under any circumstances.
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
✓
The service unit is masked
When a systemd timer unit is active and enabled but the associated service never executes, the most likely cause is that the service unit is masked. A masked unit is symlinked to /dev/null, which prevents systemd from starting it regardless of timer triggers. The timer itself runs correctly, but systemd silently ignores the request to activate the masked service.
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 unit is masked
Why this is correct
A masked service cannot be started by any method, including timers.
- ✗
The timer is not started
Why it's wrong here
The timer is shown as active and enabled, so it is started.
- ✗
The service unit is not enabled
Why it's wrong here
Timers can start services regardless of enable status.
- ✗
The timer unit has a mistake in the OnCalendar directive
Why it's wrong here
A mistake would likely cause the timer to be inactive or show an error.
Go deeper
Related to this question
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Advanced Shell Scripting and Automation
Key term
systemd
systemd is a system and service manager for Linux operating systems that initializes and manages processes, services, and system resources after the kernel boots.
Key term
Service
A service is a software component or system that performs a specific function and is available to be used by other programs or users over a network.
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Written by Johnson Ajibi, MSc IT Security
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