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Docker Certified Associate (DCA) Exam Sample Questions (Q50-Q55):
NEW QUESTION # 50
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:
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/
NEW QUESTION # 51
You want to create a container that is reachable from its host's network. Does this action accomplish this?
Solution: Use --link to access the container on the bridge network.
Answer: A
Explanation:
= The action of using --link to access the container on the bridge network does not accomplish the goal of creating a container that is reachable from its host's network. The --link option allows you to connect containers that are running on the same network, but it does not expose the container's ports to the host1. To create a container that is reachable from its host's network, you need to use the --network host option, which attaches the container to the host's network stack and makes it share the host's IP address2. Alternatively, you can use the --publish or -p option to map the container's ports to the host's ports3.
References: : Legacy container links | Docker Documentation : Networking using the host network | Docker Documentation : docker run reference | Docker Documentation
NEW QUESTION # 52
Two pods bear the same label, app: dev.
Will a label selector matching app: dev match both of these pods?
- A. Yes, if the pods are in the same Kubernetes namespace as the object bearing the label selector and both pods were preexisting when the label selector was declared.
- B. Yes, as long as all the containers in those pods are passing their livenessProbes and readinessProbes.
- C. Yes, if both pods were pre-existing when the label selector was declared.
- D. Yes, if the pods are in the same Kubernetes namespace as the object bearing the label selector
Answer: A
NEW QUESTION # 53
You add a new user to the engineering organization in DTR.
Will this action grant them read/write access to the engineering/api repository?
Solution: Add the user directly to the list of users with read/write access under the repository's Permissions tab.
Answer: B
NEW QUESTION # 54
Which docker run` flag lifts cgroup limitations?
- A. `docker run -isolation
- B. `docker run -cpu-period
- C. `docker run -privileged
- D. `docker run -cap-drop
Answer: C
Explanation:
The --privileged flag lifts all the cgroup limitations for a container, as well as other security restrictions imposed by the Docker daemon1. This gives the container full access to the host's devices, resources, and capabilities, as if it was running directly on the host2. This can be useful for certain use cases that require elevated privileges, such as running Docker-in-Docker or debugging system issues3. However, using the --privileged flag also poses a security risk, as it exposes the host to potential attacks or damages from the container4. Therefore, it is not recommended to use the --privileged flag unless absolutely necessary, and only with trusted images and containers.
The other options are not correct because they do not lift all the cgroup limitations for a container, but only affect specific aspects of the container's resource allocation or isolation:
* The --cpu-period flag sets the CPU CFS (Completely Fair Scheduler) period for a container, which is the length of a CPU cycle in microseconds. This flag can be used in conjunction with the --cpu-quota flag to limit the CPU time allocated to a container. However, this flag does not affect other cgroup limitations, such as memory, disk, or network.
* The --isolation flag sets the isolation technology for a container, which is the mechanism that separates the container from the host or other containers. This flag is only available on Windows containers, and can be used to choose between process, hyperv, or process-isolated modes. However, this flag does not affect the cgroup limitations for a container, but only the level of isolation from the host or other containers.
* The --cap-drop flag drops one or more Linux capabilities for a container, which are the privileges that a process can use to perform certain actions on the system. This flag can be used to reduce the attack surface of a container by removing unnecessary or dangerous capabilities. However, this flag does not affect the cgroup limitations for a container, but only the capabilities granted to the container by the Docker daemon.
Reference:
* Runtime privilege and Linux capabilities
* Docker Security: Using Containers Safely in Production
* Docker run reference
* Docker Security: Are Your Containers Tightly Secured to the Ship? SlideShare
* [Secure Engine]
* [Configure a Pod to Use a Limited Amount of CPU]
* [Limit a container's resources]
* [Managing Container Resources]
* [Isolation modes]
* [Windows Container Isolation Modes]
* [Windows Container Version Compatibility]
* [Docker and Linux Containers]
* [Docker Security Cheat Sheet]
* [Docker Security: Using Containers Safely in Production]
NEW QUESTION # 55
......
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