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

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Question 81

From a DevOps process standpoint, it is best practice to keep changes to an application in version control. Which of the following will allow changes to a docker Image to be stored in a version control system?

A.A docker-compose.yml file
B.docker commit
C.docker save
D.A dockerfile

Correct Answer: B

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Question 82

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

Correct 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

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Question 83

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: docker system events --filter splunk

A.Yes
B.No

Correct Answer: B

Explanation
= The solution will not configure a Docker container to export container logs to the logging solution, such as Splunk. The command docker system events --filter splunk is not a valid command to send logs to a remote destination. The --filter option for docker system events only accepts the following keys: container, daemon, event, image, label, network, plugin, type, and volume1. splunk is not a valid key for filtering events. To configure a Docker container to export container logs to a logging solution, such as Splunk, you need to use the --log-driver and --log-opt options when creating or running the container2. For example, to use the Splunk logging driver, you can use the following command:
docker run --log-driver=splunk --log-opt splunk-token=176FCEBF-4CF5-4EDF-91BC-703796522D20
--log-opt splunk-url=https://splunkhost:8088 ...
This command will send the container logs to the Splunk HTTP Event Collector (HEC) endpoint specified by the splunk-url option, using the authentication token provided by the splunk-token option3. You can also use other logging drivers, such as syslog, fluentd, gelf, etc., depending on your logging solution4. References:
* 1: docker system events | Docker Docs
* 2: Configure logging drivers | Docker Docs
* 3: Splunk logging driver | Docker Docs
* 4: Supported logging drivers | Docker Docs

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Question 84

Will this command display a list of volumes for a specific container?
Solution. 'docker container inspect nginx'

A.Yes
B.No

Correct Answer: B

Explanation
This command will not display a list of volumes for a specific container, as it will show detailed information on the container itself, such as its configuration, network settings, state, and log path1. To display a list of volumes for a specific container, you need to use the --format option with a custom template that filters the output by the Mounts field2. For example, the following command will show the source and destination of the volumes mounted in the nginx container:
docker container inspect --format=' { {range .Mounts}} { {.Source}} -> { {.Destination}} { {end}}' nginx References:
* docker container inspect | Docker Docs
* How to Use Docker Inspect Command - Linux Handbook

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Question 85

Which of the following is true about using the '-P' option when creating a new container?

A.Docker binds each exposed container port with the same port on the host
B.Docker binds each exposed container port to a random port on a specified host interface
C.Docker binds each exposed container port to a random port on all the host's interface
D.Docker gives extended privileges to the container.

Correct Answer: C

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