Quick Answer
The answer is `docker build .`. This command is correct because it instructs Docker to read the Dockerfile located in the current directory and build a custom image based on its instructions, where the dot (`.`) defines the build context—the set of files and directories accessible to the Docker daemon during the build process. On the CompTIA Linux+ XK0-005 exam, this tests your understanding of container image creation and the fundamental syntax for building from a Dockerfile, often appearing in scenario-based questions where you must choose the correct command to produce a deployable image. A common trap is confusing `docker build` with `docker commit` or omitting the context path; remember that the dot is not optional—it specifies where the Dockerfile and any referenced files live. Memory tip: think of the dot as “right here, right now”—it tells Docker to look in the current directory for the build instructions.
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 systems administrator wants to build a custom Docker image from a Dockerfile located in the current directory. Which command should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
docker create .
Why wrong: Creates container.
docker commit .
Why wrong: Creates from container.
docker build .
Builds from Dockerfile.
docker image build .
Why wrong: Alternative, but docker build is standard.
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 build .
The `docker build .` command reads the Dockerfile from the current directory and builds a custom Docker image from its instructions. This is the standard command for building an image from a Dockerfile, where the dot represents the build context (the current directory).
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 create .
Why it's wrong here
Creates container.
docker commit .
Why it's wrong here
Creates from container.
docker build .
Why this is correct
Builds from Dockerfile.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
docker image build .
Why it's wrong here
Alternative, but docker build is standard.
Common exam traps
The trap here is that candidates may confuse `docker build` with the deprecated `docker image build` syntax or mistakenly think `docker commit` can build from a Dockerfile, when it actually captures container state changes.
Detailed technical explanation
The `docker build` command sends the build context (the directory specified) to the Docker daemon, which then processes the Dockerfile line by line, creating intermediate layers that are cached for efficiency. A subtle behavior is that files outside the build context cannot be referenced in COPY or ADD instructions, which often surprises users who try to include parent directory files. In real-world CI/CD pipelines, using `.dockerignore` files is critical to exclude unnecessary files from the build context, reducing image size and build time.
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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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 build . — The `docker build .` command reads the Dockerfile from the current directory and builds a custom Docker image from its instructions. This is the standard command for building an image from a Dockerfile, where the dot represents the build context (the current directory).
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Read the scenario before looking for a memorised answer.
About these practice questions
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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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