XK0-006 System Management Practice Question
A service called 'myapp' fails to start automatically after a system reboot. The administrator wants to ensure the service starts at boot. Which systemctl command should be used?
⚠ Common exam trap
A common mix-up: candidates confuse `systemctl start` (immediate start) with `systemctl enable` (boot-time start), or they mistakenly think `systemctl reenable` is a valid command for re-enabling a service.
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 enable myapp
The `systemctl enable myapp` command creates the necessary symlinks in the systemd unit configuration directories (typically `/etc/systemd/system/multi-user.target.wants/`) so that the `myapp` service is automatically started at boot. This is the correct approach because the question specifically asks to ensure the service starts after a reboot, not to start it immediately.
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 daemon-reload
Why it's wrong here
Reloads systemd configuration but does not enable services.
- ✗
systemctl start myapp
Why it's wrong here
Starts the service now but does not enable it for boot.
- ✓
systemctl enable myapp
Why this is correct
Correct: enable configures the service to start at boot.
- ✗
systemctl reenable myapp
Why it's wrong here
Not a standard systemctl command; use enable.
Go deeper
Related to this question
Learn chapter
User and Group Administration
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
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
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