Docker Interview Questions and Answer Part – 34

Which of the following open-source tools is the underlying technology for Docker Swarm?

• containerd
• SwarmKit (Ans)
• Kubernetes
• InfraKit
• The Docker daemon

Docker UCP implements RBAC via Grants. Which of the following make up a Grant?

• Subjects, roles, and nodes
• Subjects, roles, and collections (Ans)
• Roles and collections

Which of the following built-in Docker networks creates a single layer-2 container-only network across multiple Docker hosts that can be on different underlying networks?

• Bridge
• MACVLAN
• Overlay (Ans)
• NAT

Which Docker command shows the network ports that a container is exposed on?

• docker container ports
• docker port (Ans)
• docker network –port

What happens when you perform a docker volume rm against a volume attached to a running container?

• The command will fail (Ans)
• The volume will be deleted
• The volume and the container will be deleted
• You will be asked to confirm the command

Which set of container-related Linux tools did Docker’s libcontainer replace?

• LXD
• libc
• AUFS
• LXC (Ans)

What options are available for getting source code into Docker Containers?

• Create a custom container with the source code and use the “mount” command to point to your dev machine
• Create a custom docker image with the source code or create a data volume pointing to your dev machine (Ans)
• Use the Dockerfile “embedcode” instruction
• None of these

Docker works the same way as virtual machines.

• True
• False (Ans)

How do you show all containers on a machine?

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

VirtualBox is required to use Docker on Mac and Windows dev machines.

• True (Ans)
• False

What file does Docker Compose use to define services?

• compose.xml
• docker-compose.yml (Ans)
• Dockerfile
• docker-compose.son

Which of the following use Docker’s layered file system?

• VirtualBox
• Docker images only
• All of these
• Docker containers only
• Docker images and containers (Ans)

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

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

Setting up communications between multiple containers always requires multiple Docker run statements to be executed.

• False (Ans)
• True

You’ve run the “docker ps” command but no containers are showing. Why?

• All containers are stopped. (Ans)
• All containers are running.
• You don’t have an image for the container.
• None of these

What cloud provider does Docker Compose support?

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

What Dockerfile instruction can be used to execute “npm install” when creating a custom Image?

• RUN npm install (Ans)
• None of these
• npm install
• EXECUTE npm install

Specific framework versions (Node.js, ASP.NET, etc.) can be loaded on a developer machine by creating a custom Dockerfile.

• True (Ans)
• False

Key benefits of Docker for web developers includes:

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

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

• False (Ans)
• True

Rajesh Kumar

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