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2. Image Creation, Management, and Registry Questions.md

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Domain 2: Image Creation, Management, and Registry

  1. Which of the Dockerfile options executes any commands in a new layer on top of the current image and commit the results?

A RUN B CMD C ONBUILD D FROM

  1. What docker image prune command does?

A Show the history of an image B Remove one or more images C Remove unused images D Display detailed information on one or more images

  1. Dockerfile option EXPOSE publish the port to external systems. True or false?

A True B False

  1. Which of the following docker image commands display detailed information on one or more images?

A docker image detail B docker image history C docker image ls D docker image inspect

  1. What Dockerfile option EXPOSE does? A Label a container that will run as an executable B Expose defaults for an executing container C Adds metadata to an image D Informs Docker that the container listens on the specified network ports at runtime

  2. Which of the following is NOT how to create an efficient image via a Dockerfile?

A Use multi-stage builds B Combine multiple applications into a single container C Avoid installing unnecessary packages D Start with an appropriate base image

  1. What does docker image rm command do?

A Remove one or more images B Remove unused images C Display detailed information on one or more images D Show the history of an image

  1. Which of the Dockerfile options initializes a new build stage and sets the base image for subsequent instructions?

A FROM B CMD C ONBUILD D RUN

  1. Which of the following Dockerfile options creates a mount point with the specified name and marks it as holding externally mounted volumes from native host or other containers?

A VOLUME B RUN C ONBUILD D WORKDIR

  1. What Dockerfile option LABEL does?

A Label a container that will run as an executable B Adds metadata to an image C Provide defaults for an executing container D Tells Docker how to test a container to check that it is still working

  1. Which of the following is NOT a valid way to tag a Docker image? A Tag an image referenced by Name B Tag an image referenced by user ID C Tag an image referenced by image ID D Tag an image referenced by Name and Tag

  2. Which of the following is the correct command to tag an image? A docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG] B docker build tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG] C docker tag TARGET_IMAGE[:TAG] SOURCE_IMAGE[:TAG] D docker tag image SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

  3. Docker image is built up from a series of layers and each layer represents an instruction in the image's Dockerfile. True or false? A True B False

  4. Each container shares common writeable container layer. True or false?

A False B True

  1. What is the image storage solution that is part of Docker Enterprise Edition called?

A Universal Control Plane B Docker Registry C Docker Trusted Registry D Docker Hub

  1. What is the docker command to remove one or more images?

A docker image delete B docker image rm C docker remove D docker delete

  1. Which of the following is the correct command to store an image to a registry?

A docker commit [OPTIONS] NAME[:TAG] B docker upload [OPTIONS] NAME[:TAG] C docker store [OPTIONS] NAME[:TAG] D docker push [OPTIONS] NAME[:TAG]

  1. What is the docker command for displaying layers of a Docker image?

A docker info B docker image layers C docker layers D docker history

  1. What is the docker command to pull an image or a repository from a registry? A docker build B docker checkout C docker pull D docker deploy

  2. Which of the following statements is incorrect?

A The column 'size' of docker ps -s output shows the amount of data that is used for the writable layer of each container. B Copy-on-write is a Docker strategy of sharing and copying files for maximum efficiency. C When a container is deleted, the writable layer is persisted. D The column 'virtual size' of docker ps -s output shows the amount of data used for the read-only image data used by the container plus the container's writable layer 'size'.

  1. How would we go about keeping track of changes made to an image in source control (i.e., git)?

(A) We would store the Dockerfile in source control. (B) We would use Docker Trusted Registry (DTR) to handle this. (C) Maintain tags for each new version within the Docker registry. (D) We would push the image layers to a source control repository.

  1. What does the HEALTHCHECK directive do? (A) It sets a command that will be used to fix the container if it becomes unhealthy. (B) It restarts the container if it becomes unhealthy. (C) It sets a command that will be used to inform the container of the health status of the docker daemon. (D) It sets a command that will be used by the Docker daemon to determine whether the container is healthy.

  2. What does the EXPOSE directive do?

(A) It documents ports intended for publishing at the time of running a container. (B) It makes a container's port accessible externally. (C) It causes the container to listen on a port. (D) It automatically publishes ports when running a container.

  1. What does the CMD directive do?

(A) It sets the default command for the image that runs if no other command is specified. (B) It runs a command on the host when the container starts. (C) It runs a command within the image and commits it to the result. (D) It executes a command during the build process.

  1. What is the term for a package containing all the software that's needed to run a Docker container?

(A) Package (B) Repository (C) Kernel (D) Image

  1. Which of the following statements truly applies to the ENV directive?

(A) It sets environment variables that are only visible at the container runtime. (B) It sets environment variables that are made available in subsequent build steps and to containers at the runtime. (C) It sets an environment variable on the host while the container is running. (D) It sets environment variables that are only visible during later build steps.

  1. What would be the runtime working directory of a container built from the following Dockerfile?

FROM alpine WORKDIR /x WORKDIR /y WORKDIR z CMD pwd

(A) /x (B) /z (C) /y/z (D) /

  1. Dave needs Docker to use a custom stop signal for halting his software. How can he build an image that will instruct Docker on which stop signal to use?

(A) Dave should use the STOP directive. (B) Dave should use the STOPSIGNAL directive. (C) Dave should use the docker stop command. (D) Dave should locate the process and kill it manually.

  1. Which Dockerfile directive would set up the base image that can serve as our starting point for establishing a new image?

(A) START (B) FROM (C) BASE (D) ARG

  1. Which command is used to place an image into a registry? A. docker commit B. docker tag C. docker push D. docker images E. docker pull

  2. One of your developers is trying to push an image to the registry (dtr.example.com). The push fails with the error “denied: requested access to the resource is denied”. What should you verify the user has completed? A. docker login -u -p dtr.example.com B. docker registry login -u username -p dtr.example.com C. docker push /image:tag dtr.example.com D. docker images login -u -p dtr.example.com