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| Section | Objectives |
|---|---|
| Topic 1: Container Virtualization | - Container technologies
|
| Topic 2: Virtualization Concepts and Implementation | - Hypervisors and architectures
|
| Topic 3: Container Orchestration | - Kubernetes fundamentals
|
| Topic 4: Storage, Networking, and Security | - Networking
|
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NEW QUESTION # 55
Which sub-command of xl lists the block devices they are currently attached to a Xen guest domain?
Answer:
Explanation:
block-list
Explanation:
In Xen virtualization, thexltoolstack provides commands to manage and inspect guest domains. According to Xen documentation, theblock-listsub-command is used to list allblock devicescurrently attached to a specific Xen guest domain.
This command displays information such as virtual device names, backend devices, and access modes, allowing administrators to verify disk attachments and troubleshoot storage-related issues. It is commonly used after attaching or detaching disks using block-attach or block-detach.
Therefore, the correct and documented sub-command isblock-list.
NEW QUESTION # 56
What happens when the following command is executed twice in succession?
docker run -tid -v data:/data debian bash
Answer: B
Explanation:
The command docker run -tid -v data:/data debian bash creates and runs a new container from the debian image, with an interactive terminal and a detached mode, and mounts a named volume data at /data in the container12. If the volume data does not exist, it is created automatically3. If the command is executed twice in succession, two containers are created and run, each with its own terminal and process ID, but they share the same volume data. This means that both containers can access, modify, and see the contents of the data volume, and any changes made by one container are reflected in the other container. Therefore, the statement C is true and the correct answer. The statements A, B, D, and E are false and incorrect, as they do not describe the behavior of the command or the volume correctly. References:
* 1: docker run | Docker Docs.
* 2: Docker run reference | Docker Docs - Docker Documentation.
* 3: Use volumes | Docker Documentation.
* [4]: How to Use Docker Run Command with Examples - phoenixNAP.
NEW QUESTION # 57
Which virtualization platforms can Vagrant be used with? (Select all that apply)
Answer: A,B,C
Explanation:
Vagrant supports multipleproviders, allowing it to work with different virtualization and container platforms.
According to official Vagrant documentation, supported providers includeVirtualBox,VMware, andDocker.
VirtualBox is the default and most commonly used provider. VMware is supported through official plugins.
Docker is also supported as a provider, enabling lightweight container-based development environments.
Option D ("Haws") is an apparent typographical error and does not correspond to a valid virtualization platform. While Vagrant can integrate with AWS via community or third-party plugins, the option as written is invalid.
Therefore, the correct answers areA, B, and C.
NEW QUESTION # 58
What is Docker Hub?
Answer: D
Explanation:
Docker Hub is acloud-based container image registryused to store, manage, and distribute Docker container images. According to container documentation, it hosts bothofficial imagesand user-contributed images.
Docker Hub is not a Linux distribution, orchestration platform, or runtime. Therefore, the correct answer isB.
NEW QUESTION # 59
Which of the following values would be valid in the FROM statement in aDockerfile?
Answer: D
Explanation:
The FROM statement in a Dockerfile specifies the base image from which the subsequent instructions are executed1. The value of the FROM statement can be either an image name, an image name with a tag, or an image ID1. The image name can be either a repository name or a repository name with a registry prefix2. For example, ubuntu is a repository name, and docker.io/ubuntu is a repository name with a registry prefix2. The tag is an optional identifier that can be used to specify a particular version or variant of an image1. For example, ubuntu:focal refers to the image with the focal tag in the ubuntu repository2. The image ID is a unique identifier that is automatically generated when an image is built or pulled1. For example, sha256:
9b0dafaadb1cd1d14e4db51bd0f4c0d56b6b551b2982b2b7c637ca143ad605d2 is an image ID3.
Therefore, the only valid value in the FROM statement among the given options is ubuntu:focal, which is an image name with a tag. The other options are invalid because:
* docker://ubuntu:focal is not a valid image name format. The docker:// prefix is used to specify a transport protocol, not a registry prefix4.
* registry:ubuntu:focal is not a valid image name format. The registry prefix should be a valid hostname or IP address, not a generic term2.
* file:/tmp/ubuntu/Dockerfile is not a valid image name format. The file: prefix is used to specify a local file path, not an image name5.
* http://docker.example.com/images/ubuntu-focal.iso
is not a valid image name format.
The
http:// prefix is used to specify a web URL, not an image name
5.
References:
1: Dockerfile reference | Docker Docs
2: docker - Using FROM statement in dockerfile - Stack Overflow
3: How to get the image id from a docker image - Stack Overflow
4: skopeo - Docker Registry v2 API tool - Linux Man Pages (1)
5: How to build a Docker image from a local Dockerfile? - Stack Overflow
NEW QUESTION # 60
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