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Docker Certified Associate (DCA) Exam Sample Questions (Q179-Q184):

NEW QUESTION # 179
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: namespaces

A. Yes
B. No

Answer: A

Explanation:
Explanation
Namespaces are a Linux kernel feature that isolate containers from each other and from the host system. They limit the access of a container to host resources, such as CPU or memory, by creating a separate namespace for each aspect of a container, such as process IDs, network interfaces, user IDs, etc. This way, a container can only see and use the resources that belong to its own namespace, and not those of other containers or the host12. References:
* Isolate containers with a user namespace | Docker Docs
* Docker overview | Docker Docs

NEW QUESTION # 180
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 persistentVolumeClaim is created that specifies a pre-defined provisioner.

A. Yes
B. No

Answer: B

Explanation:

Explore
The creation of a persistentVolumeClaim with a specified pre-defined provisioner is not sufficient for Kubernetes to dynamically provision a persistentVolume. There are otherfactors and configurations that need to be considered and set up, such as storage classes and the appropriate storage provisioner configurations. A persistentVolumeClaim is a request for storage by a user, which can be automatically bound to a suitable persistentVolume if one exists or dynamically provisioned if one does not exist1. A provisioner is a plugin that creates volumes on demand2. A pre-defined provisioner is a provisioner that is built-in or registered with Kubernetes, such as aws-ebs, gce-pd, azure-disk, etc3. However, simply specifying a pre-defined provisioner in a persistentVolumeClaim is not enough to trigger dynamic provisioning. You also need to have a storage class that defines the type of storage and the provisioner to use4. A storage class is a way of describing different classes or tiers of storage that are available in the cluster5. You can create a storage class with a pre-defined provisioner, or use a default storage class that is automatically created by the cluster6. You can also specify parameters for the provisioner, such as the type, size, zone, etc. of the volume to be created7. To use a storage class for dynamic provisioning, you need to reference it in the persistentVolumeClaim by name, or use the special value "" to use the default storage class. Therefore, to enable dynamic provisioning, you need to have both a persistentVolumeClaim that requests a storage class and a storage class that defines a provisioner. Reference:
Persistent Volumes
Dynamic Volume Provisioning
Provisioner
Storage Classes
Configure a Pod to Use a PersistentVolume for Storage
Change the default StorageClass
Parameters
[PersistentVolumeClaim]
I also noticed that you sent me two images along with your question. The first image shows the Kubernetes logo, which consists of seven spokes connected to a central hub, forming an almost circular shape. The logo is blue and placed on a white background. It's encapsulated within a hexagonal border. The second image shows a diagram of the relationship between persistent volumes, persistent volume claims, and pods in Kubernetes. It illustrates how a pod can use a persistent volume claim to request storage from a persistent volume, which can be either statically or dynamically provisioned. The diagram also shows how a storage class can be used to define the type and provisioner of the storage. I hope this helps you understand the concept of persistent storage in Kubernetes.

NEW QUESTION # 181
Will this Linux kernel facility limit a Docker container's access to host resources, such as CPU or memory?
Solution: seccomp

A. Yes
B. No

Answer: B

NEW QUESTION # 182
Will this command display a list of volumes for a specific container?
Solution: docker volume inspect nginx'

A. Yes
B. No

Answer: 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 name1. 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 output2. 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 References:
* docker volume inspect | Docker Docs
* docker inspect | Docker Docs

NEW QUESTION # 183
Will this command display a list of volumes for a specific container?
Solution: 'docker container inspect nginx'

A. Yes
B. No

Answer: A

Explanation:
= The command docker container inspect nginx will display a list of volumes for the specific container named nginx. The output of the command will include a section called "Mounts" that shows the source, destination, mode, type, and propagation of each volume mounted in the container1. For example, the following output shows that the container nginx has two volumes: one is a bind mount from the host's /var/log/nginx directory to the container's /var/log/nginx directory, and the other is an anonymous volume created by Docker at /var/lib/docker/volumes/... and mounted to the container's /etc/nginx/conf.d directory2.
"Mounts": [
{
"Type": "bind",
"Source": "/var/log/nginx",
"Destination": "/var/log/nginx",
"Mode": "rw",
"RW": true,
"Propagation": "rprivate"
},
{
"Type": "volume",
"Name": "f6eb3dfdd57b7e632f6329a6d9bce75a1e8ffdf94498e5309c6c81a87832c28d",
"Source": "/var/lib/docker/volumes/f6eb3dfdd57b7e632f6329a6d9bce75a1e8ffdf94498e5309c6c81a87832c28d/_data",
"Destination": "/etc/nginx/conf.d",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
]
:
docker container inspect
List volumes of Docker container

NEW QUESTION # 184
......

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Steve Allen Steve Allen

Biography

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