Docker Interview Questions and Answer Part – 35

What Docker technologies are available to support communication between containers?

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

Bridge networks can be defined in Docker Compose files.

• False
• True (Ans)

What command can be run to download an image from Docker Hub?

• docker images
• docker rmi [image name]
• docker pull [image name] (Ans)
• docker ps -a

Docker Kitematic can ONLY be used to download Docker images.

• False (Ans)
• True

Docker Kitematic provides a way to visually search for images hosted on __?

• VirtualBox
• Docker Hub (Ans)
• Docker Client
• Docker Machine

What syntax can be used to create a volume that Docker manages?

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

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

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

Environment variables can be defined in Docker Compose files.

• False
• True (Ans)

What command can be used to “link” a command terminal window to a Docker machine?

• docker-machine env [machine name](Ans)
• docker rm [machine name]
• docker env [machine name]
• docker-machine environment [machine name]

Which of the following statements accurately describe a Docker volume?

• All of these (Ans)
• Can be shared and reused among containers
• Persisted even after a container is deleted
• Are not affected by updates to images
• Special type of directory in a container

What key concepts does Docker rely on?

• Virtual machines and LXC
• Images and containers (Ans)
• Images and archives
• Images and virtual machines

What command-line switches are used with legacy linking?

• –net and –name
• –link and –name (Ans)
• –com and –name
• –run and –link

Docker volumes are persisted even after a container is deleted.

• False
• True (Ans)

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

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

Which of the following tasks can Docker Cloud perform?

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

Dockerfile contains binary instructions.

• True
• False (Ans)

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

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

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

What syntax can be used to delete a Docker volume and a container?

• docker rm -rv containerName
• docker rm volume containerName
• docker rm -v containerName (Ans)
• docker rm remove-volume containerName

What task does Docker Machine perform?

• Create and manage Docker images
• Find and install Docker images
• Create and manage containers
• All of these
• Create and manage local machines (Ans)

Docker Cloud provides a browser-based terminal for services.

• True (Ans)
• False

Docker Toolbox can only be installed and run on Linux.

• False (Ans)
• True

What Docker Compose command can be used to create service images?

• docker compose
• docker-compose create
• docker-compose make
• docker-compose build (Ans)

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

Docker containers can be started and stopped.

• False
• True (Ans)

Docker Images consist of read-only layers.

• True (Ans)
• False

Rajesh Kumar

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