Docker Interview Questions and Answer Part – 24

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

Rajesh Kumar

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