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Docker Certified Associate (DCA) Exam Sample Questions (Q158-Q163):

NEW QUESTION # 158
Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?
Solution: A default provisioner is specified, and subsequently a persistentVolumeClaim is created.

A. Yes
B. No

Answer: B

Explanation:
Explanation
These conditions are not sufficient for Kubernetes to dynamically provision a persistentVolume, because a default provisioner is not enough to determine how to create a persistentVolume. According to the official documentation, you also need to specify a default storageClass or annotate your persistentVolumeClaim with a specific storageClass name.
References: https://kubernetes.io/docs/concepts/storage/dynamic-provisioning/#defaulting-behavior

NEW QUESTION # 159
Does this describe the role of Control Groups (cgroups) when used with a Docker container?
Solution: role-based access control to clustered resources

A. Yes
B. No

Answer: 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 kernelthat 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 concept that refers to controlling access to resources based on the roles of individual users within an organization5.
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 # 160
What is the difference between a resource limit and a resource reservation when scheduling services?

A. A resource limit and a resource reservation can be used interchangeably.
B. A resource limit is a soft limit for your service, while a reservation is hard limit and the docker engine will do its best to keep your service at the limit.
C. A resource limit is used to find a host with adequate resources for scheduling a hard limit for your service, while a reservation is hard limit for your service.
D. A resource limit is hard limit for your service, while a reservation is used to find a host with adequate resources for scheduling. Correct

Answer: A

NEW QUESTION # 161
You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Turn the configuration file into a configMap object, use it to populate a volume associated with the pod, and mount that file from the volume to the appropriate container and path.

A. Yes
B. No

Answer: B

Explanation:
= Mounting the configuration file directly into the appropriate pod and container using the
.spec.containers.configMounts key is not a valid way to provide a configuration file to a container at runtime. The .spec.containers.configMounts key does not exist in the Kubernetes API1. The correct way to provide a configuration file to a container at runtime is to use a ConfigMap2. A ConfigMap is a Kubernetes object that stores configuration data as key-value pairs. You can create a ConfigMap from a file, and then mount the ConfigMap as a volume into the pod and container. The configuration file will be available as a file in the specified mount path3. Alternatively, you can also use environment variables to pass configuration data to a container from a ConfigMap4. References:
* PodSpec v1 core
* Configure a Pod to Use a ConfigMap
* Populate a Volume with data stored in a ConfigMap
* Define Container Environment Variables Using ConfigMap Data

NEW QUESTION # 162
An application image runs in multiple environments, with each environment using different certificates and ports. Is this a way to provision configuration to containers at runtime?
Solution. Create a Dockerfile for each environment, specifying ports and Docker secrets for certificates.

A. Yes
B. No

Answer: B

Explanation:
Explanation
Creating a Dockerfile for each environment, specifying ports and Docker secrets for certificates, is not a way to provision configuration to containers at runtime. A Dockerfile defines the configuration of an image at build time, not at runtime. Creating a different Dockerfile for each environment is not a good practice, as it introduces duplication and inconsistency. To provision configuration to containers at runtime, you can use environment variables, config objects, or command-line arguments. References:
https://docs.docker.com/engine/reference/builder/, https://docs.docker.com/engine/swarm/configs/,
https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables-e-env-env-file

NEW QUESTION # 163
......

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