Free DCA Exam Braindumps (page: 14)

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Will this command display a list of volumes for a specific container?

Solution: docker volume logs nginx --containers'

  1. Yes
  2. No

Answer(s): B

Explanation:

= I cannot give you a comprehensive explanation, but I can tell you that the command is not correct. The docker volume command is used to manage volumes, not to display logs. The docker logs command is used to display the logs of a container. The solution suggests using docker volume logs nginx --containers, which is not a valid syntax. To display the list of volumes for a specific container, you can use the docker inspect command with a filter option. For example, docker inspect -f `{{ .Mounts }}' nginx will show the volumes mounted by the nginx container. You will need to understand how to use the docker commands and options to answer this question correctly.


Reference:

Docker volume command documentation: 1

Docker logs command documentation: 2

Docker inspect command documentation: 3

How to list volumes of a container: 4

I hope this helps you prepare for your DCA exam. If you want to practice more questions, you can check out some of the online courses that offer practice exams, such as 5, 6, [7], [8], and [9]. Good luck!



Will this command display a list of volumes for a specific container?

Solution: docker volume inspect nginx'

  1. Yes
  2. No

Answer(s): B

Explanation:

= The command docker volume inspect nginx will not display a list of volumes for a specific container. This is because docker volume inspect expects one or more volume names as arguments, not a container name. To display a list of volumes for a specific container, you can use the docker inspect command with the --format option and a template that extracts the volume information from the container JSON output. For example, to display the source and destination of the volumes mounted by the container nginx, you can use the following command:

docker inspect --format=' { {range .Mounts}} { {.Source}}: { {.Destination}} { {end}}' nginx


Reference:

docker volume inspect | Docker Docs docker inspect | Docker Docs



Does this describe the role of Control Groups (cgroups) when used with a Docker container?

Solution: user authorization to the Docker API

  1. Yes
  2. No

Answer(s): B

Explanation:

= The role of Control Groups (cgroups) when used with a Docker container is not user authorization to the Docker API. Cgroups are a feature of the Linux kernel that allow you to limit the access processes and containers have to system resources such as CPU, RAM, IOPS and network. Cgroups enable Docker to share available hardware resources to containers and optionally enforce limits and constraints. User authorization to the Docker API is a different concept that involves granting permissions to users or groups to perform certain actions on the Docker daemon, such as creating, running, or stopping containers.


Reference:

Lab: Control Groups (cgroups) | dockerlabs

Runtime metrics | Docker Docs

Authorize users to access the Docker API | Docker Docs

I hope this helps you understand the role of cgroups and how they work with Docker containers. If you have any other questions related to Docker, please feel free to ask me.



Does this describe the role of Control Groups (cgroups) when used with a Docker container?

Solution: role-based access control to clustered resources

  1. Yes
  2. No

Answer(s): B

Explanation:

= The role of Control Groups (cgroups) when used with a Docker container is not role-based access control to clustered resources. Cgroups are a feature of the Linux kernel that allow you to limit, manage, and isolate resource usage of collections of processes running on a system. Resources are CPU time, system memory, network bandwidth, or combinations of these resources, and so on. Cgroups allow Docker Engine to share available hardware resources to containers and optionally enforce limits and constraints. Cgroups can help avoid "noisy neighbor" issues and improve the performance and security of containers. Role-based access control (RBAC) is a different concept that refers to controlling access to resources based on the roles of individual users within an organization.


Reference:

: Lab: Control Groups (cgroups) | dockerlabs : Container security fundamentals part 4:
Cgroups | Datadog Security Labs : Docker Namespace Vs Cgroup. Namespace and Cgroup | by MrDevSecOps - Medium : Role-based access control - Wikipedia : Control groups (cgroups) - Learn Docker - Fundamentals of Docker 18.x ...






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