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| Section | Objectives |
|---|---|
| Docker Installation & Configuration | - Docker Engine setup and configuration
|
| Troubleshooting | - Diagnostics and debugging
|
| Storage and Volumes | - Data persistence in Docker
|
| Security | - Docker security fundamentals
|
| Image Creation, Management, and Registry | - Docker images lifecycle
|
| Orchestration | - Container orchestration basics
|
| Networking | - Docker networking concepts
|
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NEW QUESTION # 135
You are troubleshooting a Kubernetes deployment called api, and want to see the events table for this object.
Does this command display it?
Solution: kubectl logs deployment api
Answer: A
Explanation:
= The command kubectl logs deployment api does not display the events table for the deployment object, but rather the logs of the pods that belong to the deployment. To see the events table, you need to use the command kubectl describe deployment api, which shows the details of the deployment, including the events1. References: Kubernetes Documentation, Practice Questions for Docker Certified Associate (DCA) Exam
NEW QUESTION # 136
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker container run myorg/myimage:1.0
Answer: B
Explanation:
Docker will block the command docker container run myorg/myimage:1.0 if the image tag myorg/myimage:1.0 is unsigned and the environment variable DOCKER_CONTENT_TRUST=1 is set. The reason is that setting DOCKER_CONTENT_TRUST=1 enables Docker Content Trust (DCT), which is a feature that allows users to verify the integrity and publisher of Docker images using digital signatures1.
When DCT is enabled, Docker will only pull, run, or build images that have valid signatures. If an image tag is unsigned or has an invalid signature, Docker will reject the operation and display an error message2. Therefore, to run an unsigned image with DCT enabled, you need to either disable DCT by setting DOCKER_CONTENT_TRUST=0 or use the --disable-content-trust flag, or sign the image tag with a valid key3. References:
* Content trust in Docker
* Determine if Docker image is signed or unsigned
* Signing Images and Enabling Docker Content Trust
NEW QUESTION # 137
A users attempts to set the system time from inside a Docker container are unsuccessful. Could this be blocking this operation?
Solution: Linux capabilities
Answer: B
Explanation:
= Linux capabilities are a way of restricting the privileges of a process or a container. By default, Docker containers run with a reduced set of capabilities, which means they cannot perform certain operations that require higher privileges, such as setting the system time1. To allow a container to set the system time, you need to grant it the SYS_TIME capability by using the --cap-add option when running the container2. For example, docker run --cap-add SYS_TIME alpine date -s 12:00 would set the system time to 12:00 inside the alpine container3. References: Docker Documentation, Runtime privilege and Linux capabilities, Change system date time in Docker containers without impacting host, Is it possible to change time dynamically in docker container?
NEW QUESTION # 138
Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution. Run docker engine activate.
Answer: B
Explanation:
Explanation
Running docker engine activate does upgrade Docker Engine CE to Docker Engine EE. The docker engine activate command is a convenience script that automates the process of uninstalling Docker Engine CE and installing Docker Engine EE on supported platforms. It requires an activation token or license file that can be obtained from Docker Hub or Docker Store. References:
https://docs.docker.com/engine/install/centos/#upgrade-docker-after-using-the-convenience-script,
https://docs.docker.com/engine/install/ubuntu/#upgrade-docker-after-using-the-convenience-script,
https://docs.docker.com/engine/install/debian/#upgrade-docker-after-using-the-convenience-script
NEW QUESTION # 139
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
Answer: A
Explanation:
The command docker system events --filter splunk will not configure a Docker container to export container logs to the logging solution. The command docker system events will display real-time events from the Docker daemon, such as container creation, start, stop, etc. The --filter option will filter the events by various criteria, such as type, label, name, etc. However, there is no filter for splunk, and even if there was, it would only show the events related to Splunk, not the container logs. To configure a Docker container to export container logs to Splunk, you need to use the Splunk loggingdriver, which is a plugin that sends container logs to HTTP Event Collector in Splunk Enterprise and Splunk Cloud. You can use the --log-driver and --log-opt options when creating or running a container to specify the Splunk logging driver and its options, such as the Splunk token, URL, source, sourcetype, index, etc. Alternatively, you can configure the Splunk logging driver as the default logging driver for the Docker daemon by setting the log-driver and log-opts keys in the daemon.json file and restarting Docker. Reference:
docker system events
Splunk logging driver
How to send Docker containers logs to Splunk?
NEW QUESTION # 140
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