Dockerfile MCQs with answers Page - 5

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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Q. Which Dockerfile instruction copies files from the host system to the container?

  • (A) MOVE
  • (B) GET
  • (C) COPY
  • (D) PASTE

A

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Q. What is the function of the `CMD` instruction?

  • (A) Defines the image entry point
  • (B) Runs during the build process
  • (C) Provides default arguments for the container
  • (D) Builds the image

A

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Q. Which instruction sets the working directory inside a Docker container?

  • (A) WORKINGDIR
  • (B) DIR
  • (C) WORKDIR
  • (D) SETDIR

A

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Q. What does the `EXPOSE` instruction do in a Dockerfile?

  • (A) Opens a file
  • (B) Publishes a container to a repository
  • (C) Informs Docker that the container listens on a port
  • (D) Starts a process

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Q. How can you specify environment variables in a Dockerfile?

  • (A) SETENV
  • (B) ENV
  • (C) VARIABLE
  • (D) DEFINE

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Q. Which Dockerfile instruction is used to add metadata to an image?

  • (A) LABEL
  • (B) ENV
  • (C) META
  • (D) INFO

A

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Q. Which instruction is used to run scripts after a container starts?

  • (A) RUN
  • (B) CMD
  • (C) SCRIPT
  • (D) AFTER

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Q. How can you copy files with permissions preserved?

  • (A) COPY --chmod
  • (B) ADD
  • (C) RUN copy
  • (D) EXPORT

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Q. Which instruction allows downloading and extracting tar files automatically?

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

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Q. What happens if multiple `CMD` instructions are in a Dockerfile?

  • (A) All are executed
  • (B) Only the first is used
  • (C) Only the last is used
  • (D) They are ignored

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