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XK0-006 Practice Question: A systems administrator needs to ensure that a…
A systems administrator needs to ensure that a custom service runs with a specific priority on a Linux server. Which command should the administrator use to achieve this?
⚠ Common exam trap
Many exam-takers confuse `nice` (for CPU priority at launch) with `renice` (for adjusting an already running process) or `ionice` (for I/O priority), leading them to select an option that does not set the priority at service start.
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
✓
nice -n -10 /usr/local/bin/myservice
The `nice` command adjusts the CPU scheduling priority of a process at launch time. Using `nice -n -10` sets a higher priority (lower nice value) for the new service, ensuring it runs with the specified priority from the start. This directly meets the requirement to run a custom service with a specific priority.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
renice -10 -p 1234
Why it's wrong here
renice alters the nice value, which affects CPU scheduling priority, not the service's configured priority persistently. It is tempting because nice values do set CPU priority, but the scenario requires setting it for a custom service, which systemd handles via unit directives rather than a running PID.
- ✗
ionice -c 2 -n 0 -p 1234
Why it's wrong here
ionice sets I/O scheduling class and priority, leaving CPU scheduling untouched. It is tempting because it does adjust process priority, but only for disk access; a service needing CPU priority requires a CPU-scheduling mechanism, not the I/O scheduler.
- ✓
nice -n -10 /usr/local/bin/myservice
Why this is correct
nice -n -10 launches the process with an explicit scheduling niceness of -10, raising its CPU priority relative to default-nice processes. This satisfies the stem's requirement to run the custom service at a specific priority, though negative values require root privileges.
- ✗
chrt -r 99 /usr/local/bin/myservice
Why it's wrong here
chrt applies a real-time scheduling policy to a running process, which can starve other tasks and is not the standard way to set a service's priority. It is tempting because it does control scheduling, but it would be correct only for genuine real-time workloads, not general service priority.
Go deeper
Related to this question
Learn chapter
Managing Storage and File Systems
Key term
Linux
Linux is an open-source operating system that manages computer hardware and software, widely used in servers, desktops, and embedded systems.
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
Senior Network & Security Engineer · founder of Courseiva
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