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Docker Certified Associate (DCA) Exam is a certification program designed to validate the skills and knowledge of IT professionals who work with Docker. Docker is an open-source platform that allows developers to build, ship, and run applications as containers. The DCA Exam Tests the candidate’s knowledge of Docker’s core concepts, including containerization, Docker networking, and the Docker CLI. DCA exam is a rigorous test of the candidate’s ability to design, deploy, and manage Docker applications.
Docker Certified Associate (DCA) Exam Sample Questions (Q48-Q53):
NEW QUESTION # 48
You want to mount external storage to a particular filesystem path in a container in a Kubernetes pod.
What is the correct set of objects to use for this?
Answer: A
Explanation:
Explanation
In Kubernetes, to mount external storage to a filesystem path in a container within a pod, you would use a volume in the pod specification. This volume is populated with a persistentVolumeClaim that is bound to an existing persistentVolume. The persistentVolume is defined and managed by the storageClass which provides dynamic or static provisioning of the volume and determines what type of storage will be provided1.
References:
*Dynamic Volume Provisioning | Kubernetes
NEW QUESTION # 49
An application image runs in multiple environments, with each environment using different certificates and ports. Is this a way to provision configuration to containers at runtime?
Solution.Create a Dockerfile for each environment, specifying ports and Docker secrets for certificates.
Answer: B
Explanation:
Explanation
Creating a Dockerfile for each environment, specifying ports and Docker secrets for certificates is not a way to provision configuration to containers at runtime. A Dockerfile is a text document that contains all the commands a user could call on the command line to assemble an image1. A Dockerfile is used to build an image, not to run a container. Once an image is built, the configuration specified in the Dockerfile cannot be changed at runtime. To provision configuration to containers at runtime, you need to use a different mechanism, such as environment variables, command-line arguments, or config maps234. References:
* Dockerfile reference | Docker Docs
* Environment variables in Compose | Docker Docs
* Override the default command | Docker Docs
* Configuration management with Containers | Kubernetes
NEW QUESTION # 50
Will this command mount the host's '/data' directory to the ubuntu container in read-only mode?
Solution: 'docker run --add-volume /data /mydata -read-only ubuntu'
Answer: B
Explanation:
n: = Using the DTR web UI to make all tags in the repository immutable is not a good way to prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository. This is because making all tags immutable would prevent any updates to the images in the repository, which may not be desirable for some use cases. For example, if a user wants to push a new version of 'nginx:latest' with a security patch, they would not be able to do so if the tag is immutable. A better way to prevent an image from being overwritten by another user is to use the DTR web UI to create a promotion policy that restricts who can push to a specific tag or repository1. Alternatively, the user can also use the DTR API to create a webhook that triggers a custom action when an image is pushed to a repository2. References:
* Prevent tags from being overwritten | Docker Docs
* Create webhooks | Docker Docs
NEW QUESTION # 51
Is this an advantage of multi-stage builds?
Solution: optimizes Images by copying artifacts selectively from previous stages
Answer: B
Explanation:
Explanation
Optimizing images by copying artifacts selectively from previous stages is an advantage of multi-stage builds.
Multi-stage builds allow you to use multiple FROM statements in your Dockerfile, each starting a new stage of the build. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image. This reduces the size and complexity of your images, and improves security and performance. References: https://docs.docker.com/build/building/multi-stage/,
https://docs.docker.com/engine/reference/builder/#copy
NEW QUESTION # 52
A user's attempts to set the system time from inside a Docker container are unsuccessful.
Could this be blocking this operation?
Solution. SELinux
Answer: B
Explanation:
Explanation
SELinux is not blocking this operation. SELinux is a security module that enforces mandatory access control policies on Linux systems. SELinux can restrict the actions of processes and users based on their security contexts and labels. However, SELinux does not prevent a user from setting the system time from inside a Docker container. The reason why a user's attempts to set the system time from inside a Docker container are unsuccessful is because Docker containers share the same kernel and clock as the host by default. Therefore, changing the system time inside a container requires privileged access to the host kernel, which is not allowed by default for security reasons. To allow a user to set the system time from inside a Docker container, you need to run the container with the --privileged flag or the --cap-add SYS_TIME flag. References:
https://docs.docker.com/engine/security/selinux/,
https://docs.docker.com/engine/reference/run/#runtime-privilege-and-linux-capabilities
NEW QUESTION # 53
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