Docker - Getting Started

Docker - Getting Started#

Knowledge Check Questions#

  1. True or False: The -d flag in the docker run command runs the container in the foreground.

  2. Which of the following docker run flags is used to map ports between the host and the container?

  • A) -port

  • B) -pmap

  • C) -p

  • D) none of the above

  1. The Docker ________ provides a quick view of containers running on your machine and allows you to manage their lifecycle.

  • A) CLI

  • B) Dashboard

  • C) Engine

  • D) Registry

  1. A container image provides the isolated ________ for a container.

  • A) Network

  • B) Filesystem

  • C) Memory

  • D) CPU

  1. What is a Dockerfile?

  • A) A compiled binary file that runs containers.

  • B) A text-based script of instructions to create a container image.

  • C) A graphical user interface for Docker.

  • D) A network configuration file for Docker.

  1. What is the standard filename used to define instructions for building a Docker image?

  • A) docker-image.txt

  • B) Containerfile

  • C) Dockerfile

  • D) image.def

  1. The _______ instruction in a Dockerfile specifies the base image to start from.

  • A) RUN

  • B) CMD

  • C) FROM

  • D) COPY

  1. True or False: The docker build command is used to run a container from an image.

  2. Which command is used to start a container from a Docker image?

  • A) docker build

  • B) docker start

  • C) docker run

  • D) docker create

  1. True or False: If you don’t map ports when running a container, you can still access the application running inside from your host machine’s browser.

  2. Which command is used to stop a running Docker container?

  • A) docker kill

  • B) docker halt

  • C) docker stop

  • D) docker pause

  1. The command docker ______ is used to remove a stopped container.

  • A) remove

  • B) delete

  • C) rm

  • D) erase

  1. True or False: You must stop a container before you can remove it.

  2. What is Docker Hub?

  • A) A command-line tool for Docker.

  • B) A type of Docker volume.

  • C) A cloud registry for Docker images.

  • D) A network configuration tool for Docker.

  1. To share a Docker image, you first need to _____ it with a new name that includes your Docker Hub username.

  • A) build

  • B) push

  • C) tag

  • D) run

  1. True or False: The docker push command is used to upload a Docker image to a registry like Docker Hub.

  2. What happens to data created inside a container’s filesystem when the container is removed if volumes are not used?

  • A) It is automatically backed up to Docker Hub.

  • B) It is persisted on the host machine.

  • C) It is lost.

  • D) It is moved to a named volume automatically.

  1. ________ provide the ability to connect specific filesystem paths of the container back to the host machine for data persistence.

  • A) Networks

  • B) Images

  • C) Volumes

  • D) Registries

  1. True or False: Named volumes are physically stored inside the container image.

  2. What is the primary purpose of bind mounts in a development workflow?

  • A) To persist database data.

  • B) To share container images with others.

  • C) To mount source code into a container for live development.

  • D) To improve container security.

  1. Bind mounts give you the ability to _________ the mount point on the host machine that is connected to the container.

  • A) randomly assign

  • B) let Docker choose

  • C) completely hide

  • D) specify and control

  1. To enable communication between two Docker containers, they must be connected to the same Docker _________.

  • A) Volume

  • B) Image

  • C) Network

  • D) Registry

  1. True or False: By default, containers on the same machine can automatically communicate with each other without being on the same network.

  2. What is Docker Compose used for?

  • A) Building single container images.

  • B) Defining and managing multi-container applications.

  • C) Monitoring container resource usage.

  • D) Securing Docker containers.

  1. Docker Compose uses a _______ file to define the services of a multi-container application.

  • A) .Dockerfile

  • B) .dockercompose

  • C) .compose

  • D) .docker-compose.yml

  1. True or False: The command docker compose up is used to start all services defined in a Docker Compose file.

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