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Docker Certification
DCA Exam
Docker.DCA.v2024-05-09.q158 Dumps

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Question 86

Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: isolation between resources used by containers

A.Yes
B.No

Correct Answer: A

Explanation
Control Groups (cgroups) are a Linux kernel feature that allow you to limit, modify, or allocate resources as needed1. Docker uses cgroups to isolate the resources used by containers, such as CPU, memory, disk I/O, network, etc2. This means that each container can have its own set of resource limits and constraints, and that the containers cannot interfere with each other or with the host system2. This improves the security, performance, and reliability of the containers and the system as a whole. References:
* Lab: Control Groups (cgroups) | dockerlabs
* Docker run reference | Docker Docs

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Question 87

Your organization has a centralized logging solution, such as Splunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution.Set the log-driver-and log-opt keys to values for the logging solution (Splunk) in the daemon.json file.

A.Yes
B.No

Correct Answer: A

Explanation
To configure a Docker container to export container logs to a logging solution such as Splunk, you need to set the log-driver and log-opt keys to values for the logging solution in the daemon.json file. This will enable the Splunk logging driver, which sends container logs to HTTP Event Collector in Splunk Enterprise and Splunk Cloud1. You can also use the command-line flags --log-driver and --log-opt with docker run to use the Splunk driver for a specific container1. References:
* Splunk logging driver | Docker Docs
* Collecting docker logs and stats with Splunk | Splunk
* How to send Docker containers logs to Splunk?
* Splunk Logging Driver for Docker | Splunk

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Question 88

Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution: Delete '/var/lib/docker' directory.

A.Yes
B.No

Correct Answer: B

Explanation
Deleting '/var/lib/docker' directory does not upgrade Docker Engine CE to Docker Engine EE. The
'/var/lib/docker' directory is where Docker stores all its data and metadata related to containers, images, volumes, networks, etc. Deleting this directory will remove all your Docker data and configurations from your system, but it will not change your Docker version or edition. To upgrade Docker Engine CE to Docker Engine EE, you need to uninstall 'docker-ce' package before installing 'docker-ee' package. References:
https://docs.docker.com/engine/install/linux-postinstall/#where-are-images-and-containers-stored-on-the-filesyst
https://docs.docker.com/engine/install/centos/#upgrade-docker-after-using-the-convenience-script

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Question 89

Your organization has a centralized logging solution, such as Splunk.
Will this configure a Docker container to export container logs to the logging solution?
Solution: Set the log-driver and log-oPt keys to values for the logging solution (Splunk) In the daemon.json file.

A.Yes
B.No

Correct Answer: A

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Question 90

Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 5-1-1

A.Yes
B.No

Correct Answer: B

Explanation
This is not how they should be distributed across three datacenters or availability zones, because having one manager in two datacenters or availability zones creates a risk of losing quorum if those datacenters or availability zones become unavailable. According to the official documentation, managers should be distributed evenly across datacenters or availability zones to ensure that the swarm can survive the loss of any one datacenter or availability zone.
References: https://docs.docker.com/engine/swarm/admin_guide/#add-manager-nodes-for-fault-tolerance

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