Docker Certified Associate (DCA) Practice Questions: Storage and Volumes Domain

Docker Certified Associate (DCA) Practice Questions

Master the Storage and Volumes Domain

Test your knowledge in the Storage and Volumes domain with these 10 practice questions. Each question is designed to help you prepare for the DCA certification exam with detailed explanations to reinforce your learning.

Question 1

You have created a Docker volume named 'datavol'. Which command will list all containers currently using this volume?

A) docker ps --filter volume=datavol

B) docker volume ls --filter name=datavol

C) docker inspect --volumes datavol

D) docker ps -a --filter volume=datavol

Show Answer & Explanation

Correct Answer: D

Explanation: Option D is correct because 'docker ps -a --filter volume=datavol' will list all containers that have used the specified volume. Option A is incorrect because 'docker ps' does not support filtering by volume. Option B is incorrect because 'docker volume ls' lists volumes, not containers. Option C is incorrect because 'docker inspect --volumes' is not a valid command.

Question 2

How can you inspect the details of a Docker volume named 'webdata' to verify its configuration?

A) docker volume inspect webdata

B) docker inspect webdata

C) docker volume ls webdata

D) docker volume config webdata

Show Answer & Explanation

Correct Answer: A

Explanation: Option A is correct because 'docker volume inspect webdata' is the command used to inspect the details of a specific Docker volume, including its configuration and usage. Option B is incorrect because 'docker inspect' is used for containers and images, not volumes. Option C is incorrect because 'docker volume ls' lists all volumes but does not provide detailed information. Option D is incorrect because there is no 'docker volume config' command.

Question 3

You have a Docker container running a database application that requires persistent storage. Which Docker command would you use to create a named volume to ensure data persistence across container restarts?

A) docker volume create dbdata

B) docker run -v dbdata:/var/lib/mysql mysql

C) docker create volume dbdata

D) docker build -t dbdata .

Show Answer & Explanation

Correct Answer: A

Explanation: Option A is correct because 'docker volume create dbdata' is the correct command to create a named volume called 'dbdata'. Option B is incorrect because it uses the volume but does not create it. Option C is incorrect because 'docker create volume' is not a valid Docker command. Option D is incorrect because 'docker build' is used for building images, not creating volumes.

Question 4

How can you remove all unused volumes in Docker to reclaim space?

A) docker volume prune

B) docker volume rm all

C) docker system prune --volumes

D) docker rm --volumes

Show Answer & Explanation

Correct Answer: A

Explanation: The command 'docker volume prune' (Option A) removes all unused volumes, helping to reclaim space. Option B, 'docker volume rm all', is incorrect because 'docker volume rm' requires specific volume names and does not accept 'all' as a parameter. Option C, 'docker system prune --volumes', is incorrect because while it does remove unused volumes, the correct standalone command for volumes is 'docker volume prune'. Option D, 'docker rm --volumes', is incorrect as it is not a valid command for removing volumes.

Question 5

You need to inspect a Docker volume to find out its mount point on the host system. Which command should you use?

A) docker volume ls

B) docker volume inspect myvolume

C) docker inspect myvolume

D) docker volume info myvolume

Show Answer & Explanation

Correct Answer: B

Explanation: Option B is correct because 'docker volume inspect myvolume' provides detailed information about the volume, including its mount point. Option A is incorrect because 'docker volume ls' only lists the volumes without detailed info. Option C is incorrect because 'docker inspect' is used for containers and images, not volumes. Option D is incorrect because 'docker volume info' is not a valid Docker command.

Question 6

You are tasked with ensuring data persistence for a MySQL container. Which Docker command will you use to create a named volume and mount it to the container's data directory?

A) docker run -v mydata:/var/lib/mysql mysql

B) docker run --mount source=mydata,target=/var/lib/mysql mysql

C) docker run --volume mydata:/var/lib/mysql mysql

D) docker run --bind mydata:/var/lib/mysql mysql

Show Answer & Explanation

Correct Answer: A

Explanation: Option A is correct because the '-v' flag is used to create a named volume and mount it to a container's directory. Option B uses the '--mount' flag, which is an alternative but requires more specification. Option C is incorrect because '--volume' is an invalid flag. Option D is incorrect because '--bind' is not a valid Docker run option for mounting volumes.

Question 7

You need to inspect the details of a Docker volume named 'webdata'. Which command will provide you with the necessary information about this volume?

A) docker volume ls webdata

B) docker volume inspect webdata

C) docker volume info webdata

D) docker volume details webdata

Show Answer & Explanation

Correct Answer: B

Explanation: Option B is correct because 'docker volume inspect webdata' provides detailed information about the specified volume, including its mount point, driver, and options. Option A is incorrect because 'docker volume ls' lists all volumes but does not provide detailed information about a specific one. Options C and D are incorrect as they are not valid Docker commands.

Question 8

You need to inspect the details of a Docker volume named 'app_data'. Which command would provide you with the most relevant information?

A) docker volume inspect app_data

B) docker volume ls app_data

C) docker inspect app_data

D) docker volume info app_data

Show Answer & Explanation

Correct Answer: A

Explanation: The command 'docker volume inspect app_data' (Option A) is used to display detailed information about a specific Docker volume, including its mount point and configuration. Option B, 'docker volume ls app_data', is incorrect as 'docker volume ls' lists all volumes without details. Option C, 'docker inspect app_data', is incorrect because it is used for inspecting containers or images, not volumes. Option D, 'docker volume info app_data', is incorrect because it is not a valid Docker command.

Question 9

A developer needs to ensure that data written by a container to a volume is encrypted at rest. Which Docker feature can be used to achieve this?

A) Use a third-party plugin that supports encrypted volumes

B) Enable Docker's built-in volume encryption

C) Use Docker's --secure flag when creating a volume

D) Set the volume's encryption option to true in the Dockerfile

Show Answer & Explanation

Correct Answer: A

Explanation: Option A is correct because Docker itself does not provide built-in support for encrypted volumes, but third-party volume plugins can provide this functionality. Option B is incorrect as Docker does not have a built-in volume encryption feature. Option C is incorrect because there is no --secure flag for volume creation. Option D is incorrect because volume options cannot be set in a Dockerfile; they are specified at runtime.

Question 10

You are tasked with backing up a Docker volume named 'backup_volume'. Which command will create a tar archive of this volume's data?

A) docker run --rm -v backup_volume:/data -v $(pwd):/backup busybox tar czf /backup/backup.tar.gz /data

B) docker save backup_volume > backup.tar

C) docker volume backup backup_volume > backup.tar

D) docker archive volume backup_volume > backup.tar

Show Answer & Explanation

Correct Answer: A

Explanation: The command 'docker run --rm -v backup_volume:/data -v $(pwd):/backup busybox tar czf /backup/backup.tar.gz /data' runs a temporary container that mounts the volume and creates a tar archive of its contents. 'docker save' and 'docker volume backup' are not valid commands for archiving volumes, and 'docker archive volume' is not a valid Docker command.

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About DCA Certification

The DCA certification validates your expertise in storage and volumes and other critical domains. Our comprehensive practice questions are carefully crafted to mirror the actual exam experience and help you identify knowledge gaps before test day.

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