Dockerfile MCQs with answers Page - 4

You will find multiple-choice questions (MCQs) related to #Dockerfile here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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A

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Q. Which instruction is best for downloading dependencies during image build?

  • (A) COPY
  • (B) ADD
  • (C) RUN curl
  • (D) RUN

A

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Q. What’s the difference between `ADD` and `COPY`?

  • (A) `ADD` has more features than `COPY`
  • (B) `COPY` can extract archives
  • (C) `ADD` only copies files
  • (D) `COPY` supports remote URLs

A

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Q. Which Dockerfile instruction defines the user to run subsequent commands?

  • (A) USER
  • (B) RUNAS
  • (C) EXEC
  • (D) LOGIN

A

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Q. How can you reduce image size while writing Dockerfiles?

  • (A) Use larger base images
  • (B) Avoid multi-stage builds
  • (C) Use multi-stage builds
  • (D) Use many RUN instructions

A

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Q. What is the default shell in Dockerfile on Linux containers?

  • (A) cmd
  • (B) /bin/bash
  • (C) /bin/sh -c
  • (D) /usr/shell

A

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Q. Which instruction can be used to copy files with permission changes?

  • (A) COPY --chmod
  • (B) ADD --perm
  • (C) RUN cp
  • (D) USER chmod

A

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Q. Which instruction should be used to clean up cache during image build?

  • (A) CMD clean
  • (B) RUN rm -rf /var/cache && apt-get clean
  • (C) CLEAN
  • (D) RESET

A

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Q. How do you override a CMD at runtime?

  • (A) Using docker override
  • (B) By editing the image
  • (C) By providing a command in `docker run`
  • (D) You cannot override CMD

A

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Q. What happens if both `CMD` and `ENTRYPOINT` are defined?

  • (A) `CMD` is ignored
  • (B) `ENTRYPOINT` runs first
  • (C) `CMD` arguments are passed to `ENTRYPOINT`
  • (D) `CMD` and `ENTRYPOINT` conflict

A

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Coach

Q. What is the purpose of the `FROM` instruction in a Dockerfile?

  • (A) To define environment variables
  • (B) To specify the base image
  • (C) To expose ports
  • (D) To start a container

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