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Docker Certified Associate (DCA) Exam Sample Questions (Q149-Q154):

NEW QUESTION # 149
You want to provide a configuration file to a container at runtime. Does this set of Kubernetes tools and steps accomplish this?
Solution: Mount the configuration file directly into the appropriate pod and container using the
.spec.containers.configMounts key.

A. Yes
B. No

Answer: B

Explanation:
The solution given is not a valid way to provide a configuration file to a container at runtime using Kubernetes tools and steps. The reason is that there is no such key as .spec.containers.configMounts in the PodSpec. The correct key to use is .spec.containers.volumeMounts, which specifies the volumes to mount into the container's filesystem1. To use a ConfigMap as a volume source, one needs to create a ConfigMap object that contains the configuration file as a key-value pair, and then reference it in the .spec.volumes section of the PodSpec2. A ConfigMap is a Kubernetes API object that lets you store configuration data for other objects to use3. For example, to provide a nginx.conf file to a nginx container, one can do the following steps:
* Create a ConfigMap from the nginx.conf file:
kubectl create configmap nginx-config --from-file=nginx.conf
* Create a Pod that mounts the ConfigMap as a volume and uses it as the configuration file for the nginx container:
apiVersion: v1
kind: Pod
metadata:
name: nginx-pod
spec:
containers:
- name: nginx
image: nginx
volumeMounts:
- name: config-volume
mountPath: /etc/nginx/nginx.conf
subPath: nginx.conf
volumes:
- name: config-volume
configMap:
name: nginx-config
References:
* Configure a Pod to Use a Volume for Storage | Kubernetes
* Configure a Pod to Use a ConfigMap | Kubernetes
* ConfigMaps | Kubernetes

NEW QUESTION # 150
Will this command ensure that overlay traffic between service tasks is encrypted?
Solution:docker service create --network --encrypted

A. Yes
B. No

Answer: B

Explanation:
Explanation
= The command docker service create --network --encrypted will not ensure that overlay traffic between service tasks is encrypted. This is because the --network flag requires an argument that specifies the name or ID of the network to connect the service to1. The --encrypted flag is not a valid option for docker service create2. To encrypt overlay traffic between service tasks, you need to use the --opt encrypted flag on docker network create when you create the overlay network3. For example:
docker network create --opt encrypted --driver overlay my-encrypted-network Then, you can use the --network flag on docker service create to connect the service to the encrypted network.
For example:
docker service create --network my-encrypted-network my-service
References:
* docker service create | Docker Documentation
* docker service create | Docker Documentation
* Manage swarm service networks | Docker Docs
I hope this helps you understand the command and the encryption, and how they work with Docker and swarm. If you have any other questions related to Docker, please feel free to ask me.

NEW QUESTION # 151
Is this an advantage of multi-stage builds?
Solution.better logical separation of Dockerfile instructions for increased readability

A. Yes
B. No

Answer: A

Explanation:
Explanation
= Multi-stage builds allow you to use multiple FROM statements in your Dockerfile, each starting a new stage of the build1. This can help you achieve better logical separation of Dockerfile instructions for increased readability, as well as other benefits such as smaller image size, faster build time, and reduced security risks23.
By separating your Dockerfile into different stages, you can organize your instructions by their purpose, such as building, testing, or deploying your application. You can also copy only the artifacts you need from one stage to another, leaving behind the unnecessary dependencies or tools1. This can make your Dockerfile easier to read and maintain, as well as improve the performance and security of your final image. References:
* Multi-stage builds | Docker Docs
* What Are Multi-Stage Docker Builds? - How-To Geek
* Multi-stage | Docker Docs

NEW QUESTION # 152
Will this command mount the host's '/data* directory to the ubuntu container in read-only mode?
Solution. 'docker run -add-volume /data /mydata -read-only ubuntu'

A. Yes
B. No

Answer: B

Explanation:
Explanation
= The command docker run -add-volume /data /mydata -read-only ubuntu will not mount the host's /data directory to the ubuntu container in read-only mode. The reason is that the command has several syntax errors and invalid options. The correct command to mount a host directory to a container in read-only mode is docker run --mount type=bind,source=/data,target=/mydata,readonly ubuntu12. The command docker run -add-volume /data /mydata -read-only ubuntu has the following problems:
* The option -add-volume is not a valid option for docker run. The valid options for mounting a volume or a bind mount are --mount or -v12.
* The option -read-only is not a valid option for docker run. The valid option for making the container's root filesystem read-only is --read-only3. However, this option will not affect the mounted volumes or bind mounts, which have their own readonly option12.
* The argument /data /mydata is not a valid argument for docker run. The argument for docker run should be the command to run inside the container, such as bash or ping4. The source and target of the volume or bind mount should be specified in the --mount or -v option, separated by a colon12.
Therefore, the command docker run -add-volume /data /mydata -read-only ubuntu will not work as intended, and will likely produce an error message or an unexpected result. References:
* Use bind mounts
* Use volumes
* docker run
* Docker run reference

NEW QUESTION # 153
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 # 154
......

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