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Docker Certified Associate (DCA) Exam Sample Questions (Q62-Q67):
NEW QUESTION # 62
Is this an advantage of multi-stage builds?
Solution: better caching when building Docker images
Answer: A
Explanation:
Better caching when building Docker images is an advantage of multi-stage builds. 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 improve the caching efficiency of your Docker images, as each stage can use its own cache layer2. For example, if you have a stage that installs dependencies and another stage that compiles your code, you can reuse the cached layer of the dependencies stage if they don't change, and only rebuild the code stage if it changes2. This can save you time and bandwidth when building and pushing your images. Reference:
Multi-stage builds | Docker Docs
What Are Multi-Stage Docker Builds? - How-To Geek
NEW QUESTION # 63
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.
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 # 64
Can this set of commands identify the published port(s) for a container?
Solution. 'docker container inspect", docker port'
Answer: B
Explanation:
Explanation
The set of commands docker container inspect and docker port cannot identify the published port(s) for a container. The docker container inspect command returns low-level information on a container, such as its ID, name, state, network settings, mounts, etc1. However, it does not show the port mappings between the container and thehost2. The docker port command lists the port mappings or a specific mapping for a container, but it requires the container name or ID as an argument3. Therefore, to identify the published port(s) for a container, you need to use both commands together, such as docker port $(docker container inspect -f
'{{.Name}}' CONTAINER)4. References:
* docker container inspect | Docker Docs
* How to inspect a running Docker container - Stack Overflow
* docker port | Docker Docs
* List port for Docker container using command line - Stack Overflow
NEW QUESTION # 65
A persistentVolumeClaim (PVC) is created with the specification storageClass: "", and size requirements that cannot be satisfied by any existing persistentVolume.
Is this an action Kubernetes takes in this situation?
Solution: The PVC remains unbound until a persistentVolume that matches all requirements of the PVC becomes available.
Answer: A
Explanation:
Explanation
The PVC remains unbound until a persistentVolume that matches all requirements of the PVC becomes available is an action Kubernetes takes in this situation. A persistentVolumeClaim (PVC) is a request for storage by a user. A PVC specifies the desired size, access modes, and storage class of the storage. A persistentVolume (PV) is a piece of storage in the cluster that has been provisioned by an administrator. A PV has a lifecycle independent of any individual pod that uses it. A PVC is automatically bound to a suitable PV based on its requirements. If no PV exists that matches the PVC, and dynamic provisioning is not enabled, then the PVC remains unbound indefinitely until a matching PV is created. References:
https://kubernetes.io/docs/concepts/storage/persistent-volumes/,
https://kubernetes.io/docs/concepts/storage/persistent-volumes/#lifecycle-of-a-volume-and-claim
NEW QUESTION # 66
You configure a local Docker engine to enforce content trust by setting the environment variable DOCKER_CONTENT_TRUST=1.
If myorg/myimage: 1.0 is unsigned, does Docker block this command?
Solution: docker container run myorg/myimage:1.0
Answer: A
Explanation:
Docker will block the command docker container run myorg/myimage:1.0 if the image tag myorg/myimage:1.0 is unsigned and the environment variable DOCKER_CONTENT_TRUST=1 is set. The reason is that setting DOCKER_CONTENT_TRUST=1 enables Docker Content Trust (DCT), which is a feature that allows users to verify the integrity and publisher of Docker images using digital signatures1. When DCT is enabled, Docker will only pull, run, or build images that have valid signatures. If an image tag is unsigned or has an invalid signature, Docker will reject the operation and display an error message2. Therefore, to run an unsigned image with DCT enabled, you need to either disable DCT by setting DOCKER_CONTENT_TRUST=0 or use the --disable-content-trust flag, or sign the image tag with a valid key3. Reference:
Content trust in Docker
Determine if Docker image is signed or unsigned
Signing Images and Enabling Docker Content Trust
NEW QUESTION # 67
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