Linux Containers & Virtualization (Linux+): Docker & Podman Quiz

1. What is a container registry used for?

Storing and distributing container images

Managing container runtime permissions

Monitoring container CPU usage

Scheduling container deployment

2. Which tool is commonly used to orchestrate multiple Docker containers across a cluster?

Kubernetes

Systemd

Cgroups

SELinux

Submit

4. What is the purpose of the EXPOSE instruction in a Dockerfile?

To document which ports the container listens on

To automatically publish ports to the host

To enable network access between containers

To configure firewall rules

5. Which Docker command removes a stopped container?

Docker rm

Docker delete

Docker remove

Docker clean

Submit

7. In container security, what is the purpose of running containers with a non-root user?

To limit the privileges and reduce potential damage from compromised containers

To improve container performance

To enable network access

To simplify image creation

8. What does 'docker exec' allow you to do?

Run a command inside a running container

Execute a Dockerfile build process

Schedule a container to run at a specific time

Execute a container image without running it

9. Which of the following is a key difference between RUN and CMD in a Dockerfile?

RUN executes during image build; CMD sets the default container command

RUN is for production; CMD is for development

RUN requires root privileges; CMD does not

RUN creates layers; CMD does not

Submit

11. Which of the following best describes a Docker container?

A lightweight, isolated process environment with its own filesystem and resources

A complete virtual machine with its own kernel and hardware

A shell script that automates application deployment

A persistent storage volume for application data

12. In Podman, what is the equivalent of Docker Compose?

Podman Compose

Podman Stack

Podman Orchestrate

Podman Config

13. Which command lists all running containers in Docker?

Docker ps

Docker images

Docker list

Docker containers

Submit

15. What does the '-v' flag do when running a Docker container?

Mounts a volume or binds a directory into the container

Enables verbose logging output

Specifies the container version

Validates the Dockerfile syntax

16. Which networking mode allows a container to share the host's network namespace?

Host

Bridge

Overlay

None

17. What is the main advantage of using Podman over Docker?

Podman runs containers without requiring a daemon process

Podman supports only Kubernetes orchestration

Podman is exclusively designed for ARM processors

Podman eliminates the need for container images

18. In Docker, what does the 'FROM' instruction in a Dockerfile specify?

The base image for the new image

The directory to copy files from

The port to expose

The user to run the container as

19. Which command creates a new image layer in Docker?

Docker build

Docker commit

Docker layer

Docker push

20. What is the primary purpose of a Dockerfile?

To define the steps needed to build a Docker image

To store container runtime logs and metrics

To configure Docker daemon settings

To manage container networking policies

Linux Containers Quiz: Docker & Podman Mastery

1. What is a container registry used for?

2.

What first name or nickname would you like us to use?

2. Which tool is commonly used to orchestrate multiple Docker containers across a cluster?

3. In Docker networking, a ____ network provides isolated communication between containers on the same host.

4. What is the purpose of the EXPOSE instruction in a Dockerfile?

5. Which Docker command removes a stopped container?

6. A ____ is an immutable, layered snapshot of a filesystem with all dependencies needed to run an application.

7. In container security, what is the purpose of running containers with a non-root user?

8. What does 'docker exec' allow you to do?

9. Which of the following is a key difference between RUN and CMD in a Dockerfile?

10. The ____ instruction in a Dockerfile specifies the default command to run when a container starts.

11. Which of the following best describes a Docker container?

12. In Podman, what is the equivalent of Docker Compose?

13. Which command lists all running containers in Docker?

14. A Docker image layer that is read-only is created by each ____.

15. What does the '-v' flag do when running a Docker container?

16. Which networking mode allows a container to share the host's network namespace?

17. What is the main advantage of using Podman over Docker?

18. In Docker, what does the 'FROM' instruction in a Dockerfile specify?

19. Which command creates a new image layer in Docker?

20. What is the primary purpose of a Dockerfile?