XK0-006 Automation, Orchestration, and Scripting Practice Question
Which Dockerfile instruction sets the command to run when the container starts, but allows the user to override it when using docker run?
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
✓
CMD
CMD provides defaults for an executing container. If CMD is used, it can be overridden by command-line arguments to docker run. ENTRYPOINT, on the other hand, is not easily overridden without --entrypoint.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RUN
Why it's wrong here
RUN executes commands during image build, not at container start.
- ✗
STARTUP
Why it's wrong here
There is no STARTUP instruction in Dockerfile.
- ✗
ENTRYPOINT
Why it's wrong here
ENTRYPOINT configures a container to run as an executable, and its parameters are not overridden by docker run arguments unless --entrypoint is used.
- ✓
CMD
Why this is correct
Correct. CMD sets the default command, which can be overridden.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA 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 XK0-006 exam.