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Docker Certified Associate (DCA) exam is a certification program designed to validate an individual's skills in using Docker technology. DCA exam is administered by Docker, Inc., the company responsible for developing and maintaining the Docker platform. The DCA certification is globally recognized and demonstrates the holder's ability to work with Docker in a professional setting.

Docker DCA (Docker Certified Associate) is a certification exam that validates a candidate's skills and knowledge in managing and deploying Docker containers. The DCA Certification is an industry-recognized credential that demonstrates a professional's ability to work with Docker technologies and tools. It is designed for IT professionals, developers, and DevOps engineers who want to demonstrate their proficiency in Docker and containerization.

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Docker Certified Associate (DCA) Exam Sample Questions (Q144-Q149):

NEW QUESTION # 144
You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution: 'docker inspect http'

A. Yes
B. No

Answer: B

Explanation:
= The 'docker inspect' command returns low-level information on Docker objects, such as containers, images, networks, etc1 It does not show the list of historical tasks for a service. To view the list of tasks for a service, you need to use the 'docker service ps' command 2. For example, to see the tasks for the 'http' service, you would run 'docker service ps http'. This would show the ID, name, image, node, desired state, current state, and error of each task 2. References: Docker inspect | Docker Docs, Docker service ps | Docker Docs

NEW QUESTION # 145
Which one of the following commands will result in the volume being removed automatically once the container
has exited?

A. 'docker run --remove -v /foo busybox'
B. 'docker run --del -v /foo busybox'
C. 'docker run --read-only -v /foo busybox'
D. 'docker run --rm -v /foo busybox'

Answer: D

NEW QUESTION # 146
During development of an application meant to be orchestrated by Kubernetes, you want to mount the /data directory on your laptop into a container.
Will this strategy successfully accomplish this?
Solution: Create a PersistentVolume with storageciass: "" and hostPath: /data, and a persistentVolumeClaim requesting this PV. Then use that PVC to populate a volume in a pod

A. Yes
B. No

Answer: B

Explanation:
= The strategy of creating a PersistentVolume with hostPath and a PersistentVolumeClaim to mount the /data directory on your laptop into a container will not work, because hostPath volumes are only suitable for single node testing or development. They are not portable across nodes and do not support dynamic provisioning. If you want to mount a local directory from your laptop into a Kubernetes pod, you need to use a different type of volume, such as NFS, hostPath CSI, or minikube. Alternatively, you can copy the files from your laptop to the container using kubectl cp command. Reference:
Volumes | Kubernetes
Configure a Pod to Use a PersistentVolume for Storage | Kubernetes
Mount a local directory to kubernetes pod - Stack Overflow
Kubernetes share a directory from your local system to kubernetes container - Stack Overflow How to Mount a Host Directory Into a Docker Container

NEW QUESTION # 147
Does this command display all the pods in the cluster that are labeled as env; development'?
Solution. 'kubectl gel pods --all-namespaces -I 'env in (development)''

A. Yes
B. No

Answer: B

Explanation:
The command kubectl gel pods --all-namespaces -l 'env in (development)' does not display all the pods in the cluster that are labeled as env: development. The command has two typos that prevent it from working correctly. First, the verb should be get instead of gel. Second, the label selector flag should be -l instead of -I1. The correct command should be kubectl get pods --all-namespaces -l 'env in (development)', which will list all the pods across all namespaces that have a label env with a value development2. References:
* kubectl Cheat Sheet | Kubernetes
* Labels and Selectors | Kubernetes

NEW QUESTION # 148
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker image inspect myorg/myimage: 1.0

A. No
B. Yes

Answer: B

Explanation:
= Docker will block the command docker image inspect myorg/myimage: 1.0 if the image tag is unsigned and the environment variable DOCKER_CONTENT_TRUST is set to 1. This is because Docker Content Trust (DCT) enables the verification of the integrity and publisher of Docker images using digital signatures1. When DCT is enabled, Docker will only pull, run, or inspect images that have a valid signature2. If the image tag is not signed, Docker will reject the command and display an error message, such as No valid trust data for 1.03. To inspect an unsigned image, you need to either disable DCT by setting DOCKER_CONTENT_TRUST to 0, or use the --disable-content-trust flag with the command. Reference:
Content trust in Docker | Docker Docs
Enable and disable content trust in Docker | Docker Docs
Docker Content Trust: What It Is and How It Secures Container Images
[docker image inspect | Docker Docs]

NEW QUESTION # 149
......

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