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XK0-006 Practice Question: A developer wants to run a container with a…

A developer wants to run a container with a specific command that overrides the default entrypoint. Which Docker command should be used?

⚠ Common exam trap

Watch out — candidates often confuse `docker run` with `docker exec` or assume that appending a command after the image name (as in option A) overrides the entrypoint, when in fact it only overrides the CMD unless the entrypoint is explicitly changed with `--entrypoint`.

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

✓

docker run --entrypoint /bin/bash myimage

The `--entrypoint` flag in `docker run` allows you to override the default entrypoint defined in the Docker image. By specifying `--entrypoint /bin/bash`, the container will start with `/bin/bash` as its entrypoint, ignoring any `ENTRYPOINT` or `CMD` instructions in the Dockerfile. This is the standard Docker syntax for replacing the entrypoint at runtime.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    docker run myimage /bin/bash

    Why it's wrong here

    Only overrides CMD, not ENTRYPOINT.

  • ✗

    docker exec myimage /bin/bash

    Why it's wrong here

    Runs in existing container.

  • ✓

    docker run --entrypoint /bin/bash myimage

    Why this is correct

    Overrides ENTRYPOINT.

  • ✗

    docker start myimage /bin/bash

    Why it's wrong here

    start does not accept 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.