XK0-006 Automation, Orchestration, and Scripting Practice Question
A developer creates a Dockerfile for a web application. Which instruction should be used to define the command that runs when the container starts, allowing the container to accept arguments from the docker run command?
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, but can be overridden by command-line arguments. ENTRYPOINT is used for main command and CMD for default arguments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
START
Why it's wrong here
There is no START instruction in Dockerfile.
- ✗
ENTRYPOINT
Why it's wrong here
ENTRYPOINT also defines the executable, but is not easily overridden without --entrypoint flag.
- ✓
CMD
Why this is correct
CMD specifies the default command to run, and can be overridden by docker run arguments.
- ✗
RUN
Why it's wrong here
RUN executes commands during image build, not at container start.
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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.