Docker

Docker Interview Questions and Answer Part – 24

January 21, 2020 comments off

Which of the following tasks can Docker Cloud perform?

  • Create nodes
  • None of these
  • Start and stop services
  • All of these (Ans)
  • Create stacks

What is the role of Docker images?

  • Provides virtualization functionality across environments
  • Used to execute code at runtime
  • Acts as a blueprint or template that is used to create containers (Ans)
  • All of these

Which of the following options can be used in a Docker Compose file?

  • env_file
  • All of these (Ans)
  • container_name
  • networks

Environment variables can be defined in Docker Compose files.

  • False
  • True (Ans)

How do you show all containers on a machine?

  • docker rmi -p
  • docker showAllContainers -a
  • docker ps -a (Ans)
  • docker-machine ps -a

What syntax can be used to create a volume that “hooks” to a source code folder on your machine?

  • docker run -v $(pwd):/app imageName (Ans)
  • docker run -vol /var/temp imageName
  • None of these
  • docker run -v /var/www imageName

What Docker command can be used to view information about a custom network?

  • None of these
  • docker network inspect (Ans)
  • docker network view
  • docker view network

What syntax can be used to publish an image to Docker Hub?

  • docker create /imageName
  • docker publish /imageName
  • docker move /imageName
  • docker push /imageName (Ans)

What benefits do container networks offer?

  • Allow containers to communicate with each other in an isolated network (Ans)
  • Allow local containers to communicate with external host containers
  • Allow local containers to communicate directly with host processes
  • All of these

What tool can be used to visually work with images and containers?

  • None of these
  • VirtualBox
  • Docker Engine
  • Docker Kitematic (Ans)

What cloud provider does Docker Compose support?

  • Amazon Web Services
  • All of these (Ans)
  • Digital Ocean
  • Microsoft Azure

What command-line switch can be used to define a custom Dockerfile file name (such as node.dockerfile) when building a custom image?

  • -t
  • -customfile
  • -f (Ans)
  • -v

Which of the following tasks can Docker Compose perform?

  • Start and stop containers
  • View service logs
  • None of these
  • All of these (Ans)
  • Build services

What command can be used to start a container?

  • docker rm [image name]
  • docker ps -a
  • docker run [image name] (Ans)
  • docker go [image name]

Docker Cloud YAML files are identical to Docker Compose YAML files.

  • False (Ans)
  • True

What Docker Client command can be used to create a container network?

  • docker network create (Ans)
  • docker build network
  • docker createNetwork
  • docker ps network

Key benefits of Docker for web developers includes:

  • Setup a development environment quickly
  • All of these (Ans)
  • Simplify working with multiple framework versions
  • Consistency between environments
  • Ship code faster

A Docker _ has a “thin R/W layer.”

  • Image
  • File
  • None of these
  • Container (Ans)

What Docker technologies are available to support communication between containers?

  • Docker connect and alias networks
  • None of these
  • Docker linking and bridge networks (Ans)
  • Docker connect and bridge networks

What Docker Compose command can be used to start multiple service containers?

  • None of these
  • docker-compose start
  • docker-compose up (Ans)
  • docker run
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