Dockerfile MCQs with answers Page - 3

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. What does the `RUN` instruction do in a Dockerfile?

  • (A) Defines a default command
  • (B) Executes a command at container runtime
  • (C) Executes a command at image build time
  • (D) Deletes a file

A

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Q. Which instruction is used to specify the default command when a container starts?

  • (A) RUN
  • (B) CMD
  • (C) ENTRYPOINT
  • (D) START

A

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Q. How can you add metadata to an image using Dockerfile?

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

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Q. What is the difference between `CMD` and `ENTRYPOINT`?

  • (A) CMD is required; ENTRYPOINT is optional
  • (B) ENTRYPOINT allows arguments; CMD does not
  • (C) CMD provides defaults; ENTRYPOINT defines fixed commands
  • (D) They are interchangeable

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Q. What is the purpose of the `COPY` instruction?

  • (A) To copy from image to host
  • (B) To copy from container to host
  • (C) To copy files from host to image
  • (D) To copy files from one image to another

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Q. What does `EXPOSE 80` do in a Dockerfile?

  • (A) Starts a service on port 80
  • (B) Makes port 80 available for linking containers
  • (C) Opens a host port
  • (D) Assigns 80 as container ID

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Q. What does `ENV APP_ENV=production` do?

  • (A) Creates a label
  • (B) Runs a command
  • (C) Sets an environment variable
  • (D) Creates a user

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Q. Which instruction allows combining multiple commands into one layer?

  • (A) MULTI
  • (B) SHELL
  • (C) RUN with &&
  • (D) STACK

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Q. What is the result of using multiple `FROM` instructions?

  • (A) Error in build
  • (B) Multiple base images
  • (C) Multi-stage build
  • (D) Multiple containers

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Q. What does `VOLUME` do in Dockerfile?

  • (A) Removes files from image
  • (B) Creates persistent storage
  • (C) Increases image size
  • (D) Disables logging

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