C4-DCKR-EN

What is the difference between container and virtual machine?

• Virtual machines virtualize an entire machine down to the hardware layers

• Virtual machines virtualize software layers above the operating system level

• Each container contains a guest OS (Operating System), a virtual copy of the hardware that the OS requires to run and an application and its associated libraries and dependencies.

• Virtual machines are small, fast, and portable because they do not need to include a guest OS in every instance.

The markup language used to write Docker configuration files is:

• JSON

• YAML

• XML

• HTML

What happens if you attempt to perform a Docker build based on an image that has not been previously referenced on your machine?

• Docker will return a 408: image not found message.

• Docker will return a 404: file not found message.

• Docker will pull the image from GitHub.

• Docker will pull the image from Docker Hub.

Information on how to build a Docker image is written in a file named:

• Dockerfile

• Jenkinsfile

• docker-compose

• docker image

Which of the following statements is most correct?

• Docker allows you to run images and build containers.

• Docker allows you to run containers and build images.

• Docker allows you to run and build containers.

• Docker allows you to run and build images.

Docker containers share the same OS

• True

• False

Which of these statements about containers is false

• Containers are an improvement compared with VMs

• A container image is a lightweight, stand-alone, executable package of a piece of software

• A Container includes everything it needs to run code, runtime, system tools, system libraries, settings.

• All of them are right

Following Docker command is used to:

docker build -t my_user/repo_name:1.0

• Activate default VM machine

• Access a running container

• Build an image

• Commit changes done in a Docker image

________is a cloud-hosted service from Docker that provides registry capabilities for public and private content.

• Docker Swarm

• Docker Hub

• Docker Cloud

• Docker Compose

________is a tool for defining and running multi-container Docker applications.

• Docker Swarm

• Docker Hub

• Docker Cloud

• Docker Compose