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Docker Certified Associate (DCA) Exam Sample Questions (Q25-Q30):
NEW QUESTION # 25
Is this a type of Linux kernel namespace that provides container isolation?
Solution.Host
Answer: A
Explanation:
= Host is not a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that partitions kernel resources such thatone set of processes sees one set of resources while another set of processes sees a different set of resources1. There are eight kinds of namespaces available: Mount, Process, User, Network, UTS, IPC, Cgroup, and Time1. Host is a parameter that can be used to run a container in the host's network namespace, which means the container shares the same network interfaces and configuration as the host2. Reference:
Linux namespaces - Wikipedia
Network settings | Docker Documentation
NEW QUESTION # 26
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: inter-process communication
Answer: A
Explanation:
(Please check the official Docker site for the answer) Comprehensive = (Please check the official Docker site for the comprehensive explanation) References: (Some possible references from the web search results are)
* Docker Security - Docker Documentation
* Docker Security Best Practices - Medium
* Docker Security Cheat Sheet - GitHub
* Docker Security: A Comprehensive Guide - Snyk
* Docker Security: Tips and Tricks to Secure Your Containers - DevSecOps I hope this helps you in your exam preparation. Good luck!
NEW QUESTION # 27
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
Answer: A
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. Reference:
1: docker system events | Docker Docs
2: Configure logging drivers | Docker Docs
3: Splunk logging driver | Docker Docs
4: Supported logging drivers | Docker Docs
NEW QUESTION # 28
In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest', from being overwritten by another user with push access to the repository?
Solution: Keep a backup copy of the image on another repository.
Answer: A
Explanation:
Explanation
= Keeping a backup copy of the image on another repository is not how a user can prevent an image, such as
'nginx:latest', from being overwritten by another user with push access to the repository. This approach does not prevent the original image from being overwritten, it only provides a way to restore it from another source.
However, this may not be reliable or efficient, as the backup repository may not be in sync with the original one, or may not be accessible at all times. To prevent an image from being overwritten by another user, the user can use the DTR web UI to make the tag immutable1. This feature allows the user to lock a specific tag, so that no one can push a new image with the same tag to the repository. This ensures that the image is always consistent and secure1. References:
* Make a tag immutable | Docker Docs
NEW QUESTION # 29
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
Answer: A
Explanation:
Explanation
Creating a PersistentVolume with storageClass: "" and hostPath: /data, and a persistentVolumeClaim requesting this PV, and then using that PVC to populate a volume in a pod is not a strategy that successfully accomplishes this. A PersistentVolume is an API object that represents a piece of storage in the cluster that has been provisioned by an administrator. A PersistentVolumeClaim is a request for storage by a user. A hostPath PersistentVolume uses a file or directory on the node to emulate network-attached storage. However, this type of volume only works on a single node cluster, and it does not work on Windows nodes. Therefore, it cannot be used to mount the /data directory on your laptop into a container. References:
https://kubernetes.io/docs/concepts/storage/persistent-volumes/,
https://kubernetes.io/docs/concepts/storage/volumes/#hostpath
NEW QUESTION # 30
......
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