Quick Answer
The answer is `docker run --entrypoint /bin/bash myimage`. This command is correct because the `--entrypoint` flag overrides the default entrypoint defined in the Docker image at runtime, allowing you to replace any `ENTRYPOINT` or `CMD` instructions from the Dockerfile with a specific command like `/bin/bash`. On the CompTIA Linux+ XK0-005 exam, this tests your understanding of container runtime behavior and the distinction between `ENTRYPOINT` and `CMD`—a common trap is confusing `--entrypoint` with passing arguments after the image name, which only appends to `CMD` rather than replacing the entrypoint. A useful memory tip: think of `--entrypoint` as the “hard override” that completely swaps the container’s starting process, while anything after the image name just adds parameters.
This XK0-005 practice question tests your understanding of scripting, containers and automation. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A developer wants to run a container with a specific command that overrides the default entrypoint. Which Docker command should be used?
docker run myimage /bin/bash
Why wrong: Only overrides CMD, not ENTRYPOINT.
docker exec myimage /bin/bash
Why wrong: Runs in existing container.
docker run --entrypoint /bin/bash myimage
Overrides ENTRYPOINT.
docker start myimage /bin/bash
Why wrong: start does not accept command.
Answer choices
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
Option C is correct because 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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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.
Related concept
Read the scenario before looking for a memorised answer.
docker start myimage /bin/bash
Why it's wrong here
start does not accept command.
Common exam traps
The trap here is that 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`.
Trap categories for this question
Command / output trap
start does not accept command.
Detailed technical explanation
Under the hood, Docker containers use the `ENTRYPOINT` and `CMD` instructions to define the default executable and its arguments. The `--entrypoint` flag replaces the entire `ENTRYPOINT` at runtime, while any arguments after the image name become the new `CMD` and are passed to the entrypoint. This distinction is critical in scenarios like debugging a container with a broken entrypoint, where you need to start a shell directly without executing the application.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the XK0-005 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Scripting, Containers and Automation — study guide chapter
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CompTIA Linux+ XK0-005 study guide
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XK0-005 practice test guide
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FAQ
Scripting, Containers and Automation — This question tests Scripting, Containers and Automation — Read the scenario before looking for a memorised answer..
The correct answer is: docker run --entrypoint /bin/bash myimage — Option C is correct because 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This XK0-005 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 XK0-005 exam.
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