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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Container Virtualization | 25% | - Docker - Container Virtualization Concepts - LXC - Container Orchestration Platforms |
| Topic 2: VM Deployment and Provisioning | 12% | - Packer - Cloud Management Tools - cloud-init - Vagrant |
| Topic 3: Full Virtualization | 25% | - Virtual Machine Disk Image Management - Xen - QEMU - Libvirt Virtual Machine Management - Virtualization Concepts and Theory |
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NEW QUESTION # 19
What is the typical format for cloud-init configuration files?
Answer: C
Explanation:
Cloud-init configuration files are typically written inYAML (Yet Another Markup Language)format.
Official cloud-init documentation specifies thatcloud-configfiles use YAML syntax, which is human-readable and well suited for declarative configuration.
YAML files allow administrators to define users, packages, services, networking, and commands in a structured and consistent way. While cloud-init can process shell scripts and MIME multipart data, YAML remains thestandard and recommended format.
Thus, the correct answer isD.
NEW QUESTION # 20
Which of the following values would be valid in the FROM statement in aDockerfile?
Answer: A
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 # 21
What are cloud management tools primarily used for?
Answer: A
Explanation:
Cloud management tools are primarily used toprovision, manage, and control virtual machines and related resourcesin cloud environments. According to cloud computing documentation, these tools provide capabilities such as VM lifecycle management, resource allocation, scaling, policy enforcement, and automation via APIs.
While some tools include monitoring features, their main function is not network traffic analysis. They also do not focus on managing bare-metal servers or creating containerized applications directly.
Therefore, the correct answer isB.
NEW QUESTION # 22
After setting up a data container using the following command:
docker create -v /data --name datastore debian /bin/true
how is an additional new container started which shares the/datavolume with the datastore container?
Answer: B
Explanation:
Explanation
The correct way to start a new container that shares the /data volume with the datastore container is to use the
--volumes-from flag. This flag mounts all the defined volumes from the referenced containers. In this case, the datastore container has a volume named /data, which is mounted in the service container at the same path. The other options are incorrect because they either use invalid flags, such as --share-with or --volume-backend, or they create new volumes instead of sharing the existing one, such as -v datastore:/data or -v /data. References:
* Docker Docs - Volumes
* Stack Overflow - How to map volume paths using Docker's --volumes-from?
* Docker Docs - docker run
NEW QUESTION # 23
What is the purpose of the packer inspect subcommand?
Answer: A
Explanation:
* The purpose of the packer inspect subcommand is to display an overview of the configuration contained in a Packer template1. A Packer template is a file that defines the various components a Packer build requires, such as variables, sources, provisioners, and post-processors2. The packer inspect subcommand can help you quickly learn about a template without having to dive into the HCL (HashiCorp Configuration Language) itself1. The subcommand will tell you things like what variables a template accepts, the sources it defines, the provisioners it defines and the order they'll run, and more1.
* The other options are not correct because:
* A) Retrieve files from an existing Packer image. This is not the purpose of the packer inspect subcommand. To retrieve files from an existing Packer image, you need to use the packer scp subcommand, which copies files from a running instance of a Packer image to your local machine2.
* B) Execute commands within a running instance of a Packer image. This is not the purpose of the packer inspect subcommand. To execute commands within a running instance of a Packer image, you need to use the packer ssh subcommand, which connects to a running instance of a Packer image via SSH and runs the specified command2.
* C) List the artifacts created during the build process of a Packer image. This is not the purpose of the packer inspect subcommand. To list the artifacts created during the build process of a Packer image, you need to use the packer build subcommand with the -machine-readable flag, which outputs the build information in a machine-friendly format that includes the artifact details2.
* D) Show usage statistics of a Packer image. This is not the purpose of the packer inspect subcommand. To show usage statistics of a Packer image, you need to use the packer console subcommand with the -stat flag, which launches an interactive console that allows you to inspect and modify variables, sources, and functions, and displays the usage statistics of the current session2. References: 1: packer inspect - Commands | Packer | HashiCorp Developer 2:
Commands | Packer | HashiCorp Developer
NEW QUESTION # 24
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