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NEW QUESTION # 27
Will this command display a list of volumes for a specific container?
Solution. 'docker container logs nginx -volumes'
Answer: B
Explanation:
Explanation
Using docker container logs nginx --volumes does not display a list of volumes for a specific container. The docker container logs command shows information about the logs of a container. The --volumes flag is not a valid option for this command and will cause an error. To display a list of volumes for a specific container, you need to use docker container inspect nginx --format '{{ .Mounts }}'. References:
https://docs.docker.com/engine/reference/commandline/container_logs/,
https://docs.docker.com/engine/reference/commandline/container_inspect/
NEW QUESTION # 28
Does this command display all the pods in the cluster that are labeled as 'env: development'?
Solution: 'kubectl get pods -I env=development'
Answer: B
Explanation:
The command 'kubectl get pods -I env=development' will not display all the pods in the cluster that are labeled as 'env: development'. This is because the -I flag is not a valid option for kubectl get pods1. The correct flag to use is --selector or -l, which allows you to filter pods by labels2. Therefore, the correct command to display all the pods in the cluster that are labeled as 'env: development' is:
kubectl get pods --selector env=development
or
kubectl get pods -l env=development
:
kubectl Cheat Sheet | Kubernetes
Labels | Kube by Example
I hope this helps you understand the command and the label, and how they work with Kubernetes and pods. If you have any other questions related to Docker, please feel free to ask me.
NEW QUESTION # 29
Will this command display a list of volumes for a specific container?
Solution: docker volume logs nginx --containers'
Answer: B
Explanation:
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 logs1. The docker logs command is used to display the logs of a container2. 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 option3. For example, docker inspect -f '{{ .Mounts }}' nginx will show the volumes mounted by the nginx container4. You will need to understand how to use the docker commands and options to answer this question correctly. References:
* 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!
NEW QUESTION # 30
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: role-based access control to clustered resources
Answer: B
Explanation:
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 system1. Resources are CPU time, system memory, network bandwidth, or combinations of these resources, and so on2. Cgroups allow Docker Engine to share available hardware resources to containers and optionally enforce limits and constraints3. Cgroups can help avoid "noisy neighbor" issues and improve the performance and security of containers4. Role-based access control (RBAC) is a different conceptthat refers to controlling access to resources based on the roles of individual users within an organization5.
References: : 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 ...
NEW QUESTION # 31
The Kubernetes yaml shown below describes a networkPolicy.
Will the networkPolicy BLOCK this trafftc?
Solution. a request issued from a pod bearing only the tier: frontend label, to a pod bearing the tier: backend label
Answer: A
Explanation:
The provided Kubernetes NetworkPolicy YAML configuration indicates that the policy applies to pods with the label tier: backend in the default namespace1.The ingress rule allows traffic from pods with the label tier: api1.Therefore, a request issued from a pod bearing only the tier:frontend label to a pod bearing the tier: backend label will be blocked by this networkPolicy1.This is because the networkPolicy does not have a rule allowing ingress from pods with the tier: frontend label1. For more information on Kubernetes NetworkPolicies, you can refer to theKubernetes Documentation on Network Policies.
NEW QUESTION # 32
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