Docker Interview Questions and Answer Part – 29

With Docker for Windows, what container types can you run?

• Only Windows
• Windows and macOS
• Windows and Linux (Ans)
• Only Linux

Which of the following is an accurate statement about processes in a container?

• Container processes are different from machine processes
• Container processes are regular machine processes (Ans)
• Container processes run in a VM
• Container processes do not show in the Windows Task Manager

What does docker-compose help us avoid? Excessive calls to ________?

• docker stop
• docker build
• docker rm
• docker run (Ans)
• docker pull

What is a Docker volume?

• A directory that bypasses the container’s union file system (Ans)
• The union file system for a container
• A directory that mounts remote files
• The host file system

How can you get files out of a container onto the host? Assume a process in a container is writing files, like ffmpeg saving the contents of a converted video.
Where do you write this data?

• Write files to a volume mounted from the host (Ans)
• Write files to the default host file system mounts at C:\host or /mnt/host on Linux
• Write files to network shares
• Write files to the container file system, all writes are automatically copied to the host file system in the same folder

On Windows 10 which container types can you run?

• Hyper-V Containers (Ans)
• Windows 10 Containers
• Both Hyper-V and Windows Server Containers
• Windows Server Containers

In the past, we often download applications packaged in a zip file, or MSI, or some other package format. With Docker, what format is used to distribute software?

• Image (Ans)
• DMG
• ISO
• Zip file
• VHD

Which of the following allows you to add files from the host to a running container?

• docker cp (Ans)
• docker volumes
• docker add
• docker commit
• docker share

When executing the command “docker pull microsoft/aspnet:4.6.2” what is the “4.6.2” piece called?

• Repository
• Registry
• Image
• Tag (Ans)
• User

What’s a good analogy for docker stop?

• Uninstalls the container
• Stops a single process in a container
• Stops the processes running in a container (Ans)
• Removes the container

To get Ctrl+C to work to kill a container, what should you pass when running the container?

• –name
• -it (Ans)
• -p
• -d

How is it possible that we can run a command prompt in a container created from the microsoft/dotnet image?

• It’s not possible to run anything but the one application provided by the image
• Common OS applications like CMD.exe are mapped into the container by default
• The image also provides CMD.exe (Ans)
• We have access to all apps on the machine in addition to those in the container

What format does Docker use to export images?

• tar (Ans)
• dmg
• zip
• Image
• iso

On Windows Server 2016 which container types can you run?

• Both Hyper-V and Windows Server Containers (Ans)
• Windows Server Containers
• Windows 10 Containers
• Hyper-V Containers

Where do dangling images typically come from?

• When you stop many of the same containers
• When running lots of containers from the same image
• When building custom docker images (Ans)
• When downloading images from Docker hub

Why do containers exist?

• To make it easier to use virtual machines
• A replacement for monolithic operating systems
• A replacement for virtual machines
• To make it easier to use software (Ans)

What’s a good analogy for docker exec?

• Allows you to run additional processes in new containers
• It’s similar to installing software
• Allows you to run additional processes in a container (Ans)
• Allows you to run additional processes outside a container

What is a repository on Docker Hub?

• An image ta
• A user account
• A single image
• A collection of images (Ans)

What is used to resolve ip addresses with the embedded DNS in user-defined networks? What value is pulled from the docker-compose.yml file?

• DNS name
• environment
• Service name (Ans)
• Image name

How can I run another process inside a running container?

• docker start
• docker ps
• docker run
• docker exec (Ans)

Rajesh Kumar

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