XK0-006 Automation, Orchestration, and Scripting Practice Question
A system administrator needs to create a Dockerfile for a Python application. The application should be installed in the container, and when the container starts, it should run the command 'python app.py'. Which Dockerfile instruction should be used to specify the default 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 python app.py
CMD specifies the default command to run when the container starts. ENTRYPOINT can also be used but is typically for executables that are not easily overridden.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ENTRYPOINT python app.py
Why it's wrong here
ENTRYPOINT is also possible but typically used for the main command; CMD is more appropriate for specifying arguments or a simple default command.
- ✗
RUN python app.py
Why it's wrong here
RUN executes commands during image build, not at container start.
- ✓
CMD python app.py
Why this is correct
Correct. CMD provides default command for container execution.
- ✗
STARTUP python app.py
Why it's wrong here
STARTUP is not a valid Dockerfile instruction.
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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.