XK0-006 Automation, Orchestration, and Scripting Practice Question
An administrator is writing a Dockerfile. They need to set a default command that can be overridden when running the container. Which instruction should be used?
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 that can be overridden by command-line arguments, while ENTRYPOINT cannot be 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 build, not at container start.
- ✓
CMD
Why this is correct
CMD provides default command and arguments, which can be overridden by docker run command.
- ✗
ENTRYPOINT
Why it's wrong here
ENTRYPOINT is intended for the main command and is not easily overridden.
- ✗
EXPOSE
Why it's wrong here
EXPOSE only documents ports, it does not set a command.
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JA
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.