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  1. Home
  2. Docker Certification
  3. DCA Exam
  4. Docker.DCA.v2023-09-25.q118 Dumps
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Question 56

Your organization has a centralized logging solution, such as Sptunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution. docker system events- -filter splunk

Correct Answer: B
Explanation
This does not configure a Docker container to export container logs to the logging solution. The docker system events command shows information about real-time events in the Docker daemon. The --filter flag allows you to filter the output by various criteria, such as type, action, image, container, etc. However, splunk is not a valid filter value and will cause an error. To configure a Docker container to export container logs to the logging solution, you need to use the --log-driver and --log-opt flags when creating or running the container.
These flags allow you to specify which logging driver and options to use for the container. For example, to use Splunk as the logging driver, you can use --log-driver splunk and provide the Splunk URL, token, and other options using --log-opt. References: https://docs.docker.com/engine/reference/commandline/system_events/,
https://docs.docker.com/config/containers/logging/configure/,
https://docs.docker.com/config/containers/logging/splunk/
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Question 57

In the context of a swarm mode cluster, does this describe a node?
Solution: an instance of the Docker engine participating in the swarm

Correct Answer: B
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Question 58

Is this an advantage of multi-stage builds?
Solution: better caching when building Docker images

Correct Answer: B
Explanation
Better caching when building Docker images is not an advantage of multi-stage builds. Multi-stage builds are a feature that allows you to use multiple FROM statements in a single Dockerfile. Each FROM statement begins a new stage of the build, with its own base image and instructions. You can selectively copy artifacts from one stage to another, leaving behind everything you don't want in the final image. The advantages of multi-stage builds are:
Reducing the size of the final image by removing unnecessary dependencies or intermediate files.
Improving the security of the final image by minimizing the attack surface and avoiding leaking secrets.
Simplifying the development workflow by using different tools or environments in different stages.
Better caching when building Docker images is not an advantage of multi-stage builds, as it depends on other factors, such as the order and content of the instructions in each stage, the availability and freshness of the base images and intermediate layers, and the use of build arguments or environment variables that may invalidate the cache. References:
https://docs.docker.com/develop/develop-images/multistage-build/,
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#leverage-build-cache
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Question 59

You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Turn the configuration file into a configMap object, use it to populate a volume associated with the pod, and mount that file from the volume to the appropriate container and path.

Correct Answer: A
Explanation
This set of Kubernetes tools and steps accomplishes this, because it follows the recommended way of providing a configuration file to a container at runtime using a configMap object. According to the official documentation, this method allows you to decouple configuration artifacts from image content and update them without restarting containers.
References:
https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/#add-configmap-data-to-a-vo
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Question 60

Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution. Disable the Docker service via 'chkconfig' or 'systemctl'.

Correct Answer: B
Explanation
Disabling the Docker service via chkconfig or systemctl does not upgrade Docker Engine CE to Docker Engine EE. Disabling the Docker service only stops and prevents Docker from starting automatically on system boot. It does not change or upgrade the version of Docker Engine installed on the system. To upgrade Docker Engine CE to Docker Engine EE, you need to uninstall Docker Engine CE and install Docker Engine EE following the official instructions for your operating system. References:
https://docs.docker.com/engine/install/linux-postinstall/#disable-docker-from-starting-automatically-on-boot,
https://docs.docker.com/engine/install/centos/#uninstall-old-versions,
https://docs.docker.com/engine/install/ubuntu/#uninstall-old-versions,
https://docs.docker.com/engine/install/debian/#uninstall-old-versions,
https://docs.docker.com/ee/docker-ee/linux-install/
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