VALID 305-300 ACTUAL EXAM - PASS 305-300 EXAM

Valid 305-300 Actual Exam - Pass 305-300 Exam

Valid 305-300 Actual Exam - Pass 305-300 Exam

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Lpi 305-300 (LPIC-3 Exam 305: Virtualization and Containerization) Certification Exam is designed to test the knowledge and skills of IT professionals in virtualization and containerization technologies. LPIC-3 Exam 305: Virtualization and Containerization certification is intended for individuals who have experience in these areas and are looking to further their expertise in the field. 305-300 Exam covers a range of topics related to virtualization and containerization, including installation, configuration, management, and troubleshooting.

Lpi LPIC-3 Exam 305: Virtualization and Containerization Sample Questions (Q16-Q21):

NEW QUESTION # 16
What is the purpose of a .dockerignore file?

  • A. It specifies files that Docker does not submit to the Docker daemon when building a Docker image
  • B. It specifies which parts of a Dockerfile should be ignored when building a Docker image.
  • C. It lists files existing in a Docker image which should be excluded when building a derivative image.
  • D. It must be placed in the top level directory of volumes that Docker should never attach automatically to a container
  • E. It exists in the root file system of containers that should ignore volumes and ports provided by Docker.

Answer: A


NEW QUESTION # 17
Which of the following values are valid in thefirmwareattribute of a<os>element in a libvirt domain definition?(Choose two.)

  • A. bios
  • B. efi
  • C. scsi
  • D. virtio
  • E. pcie

Answer: A,B

Explanation:
Explanation
The firmware attribute of the <os> element in a libvirt domain definition specifies the type of firmware used to boot the virtual machine. The valid values for this attribute are efi and bios, which correspond to the Extensible Firmware Interface (EFI) and the Basic Input/Output System (BIOS) respectively. EFI is a newer standard that supports more features and security than BIOS, such as Secure Boot and faster boot times. BIOS is an older standard that is widely compatible and supported by most hypervisors and operating systems. The other values, scsi, virtio, and pcie, are not related to firmware, but to different types of devices or drivers that can be used in a virtual machine. References: 1 (search for firmware enum)


NEW QUESTION # 18
Ifdocker stackis to be used to run a Docker Compose file on a Docker Swarm, how are the images referenced in the Docker Compose configuration made available on the Swarm nodes?

  • A. docker stack instructs the Swarm nodes to pull the images from a registry, although it does not upload the images to the registry.
  • B. docker stack passes the images to the Swarm master which distributes the images to all other Swarm nodes.
  • C. docker stack builds the images locally and copies them to only those Swarm nodes which run the service.
  • D. docker stack transfers the image from its local Docker cache to each Swarm node.
  • E. docker stack triggers the build process for the images on all nodes of the Swarm.

Answer: A

Explanation:
Explanation
Docker stack is a command that allows users to deploy and manage a stack of services on a Docker Swarm cluster. A stack is a group of interrelated services that share dependencies and can be orchestrated and scaled together. A stack is typically defined by a Compose file, which is a YAML file that describes the services, networks, volumes, and other resources of the stack. To use docker stack to run a Compose file on a Swarm, the user must first create and initialize a Swarm cluster, which is a group of machines (nodes) that are running the Docker Engine and are joined into a single entity. The Swarm cluster has one or more managers, which are responsible for maintaining the cluster state and orchestrating the services, and one or more workers, which are the nodes that run the services.
When the user runs docker stack deploy with a Compose file, the command parses the file and creates the services as specified. However, docker stack does not build or upload the images referenced in the Compose file to any registry. Instead, it instructs the Swarm nodes to pull the images from a registry, which can be the public Docker Hub or a private registry. The user must ensure that the images are available in the registry before deploying the stack, otherwise the deployment will fail. The user can use docker build and docker push commands to create and upload the images to the registry, or use an automated build service such as Docker Hub or GitHub Actions. The user must also make sure that the image names and tags in the Compose file match the ones in the registry, and that the Swarm nodes have access to the registry if it is private. By pulling the images from a registry, docker stack ensures that the Swarm nodes have the same and latest version of the images, and that the images are distributed across the cluster in an efficient way.
The other options are not correct. Docker stack does not build the images locally or on the Swarm nodes, nor does it copy or transfer the images to the Swarm nodes. Dockerstack also does not pass the images to the Swarm master, as this would create a bottleneck and a single point of failure. Docker stack relies on the registry as the source of truth for the images, and delegates the image pulling to the Swarm nodes. References:
* Deploy a stack to a swarm | Docker Docs1
* docker stack deploy | Docker Docs2
* docker build | Docker Docs3
* docker push | Docker Docs4


NEW QUESTION # 19
Which of the following kinds of data cancloud-initprocess directly from user-data? (Choose three.)

  • A. Lists of URLs to import
  • B. ISO images to boot from
  • C. cloud-config declarations in YAML
  • D. Shell scripts to execute
  • E. Base64-encoded binary files to execute

Answer: A,C,D

Explanation:
Explanation
Cloud-init is a tool that allows users to customize the configuration and behavior of cloud instances during the boot process. Cloud-init can process different kinds of data that are passed to the instance via user-data, which is a mechanism provided by various cloud providers to inject data into the instance. Among the kinds of data that cloud-init can process directly from user-data are:
* Shell scripts to execute: Cloud-init can execute user-data that is formatted as a shell script, starting with the #!/bin/sh or #!/bin/bash shebang. The script can contain any commands that are valid in the shell environment of the instance. The script is executed as the root user during the boot process12.
* Lists of URLs to import: Cloud-init can import user-data that is formatted as a list of URLs, separated by newlines. The URLs can point to any valid data source that cloud-init supports, such as shell scripts, cloud-config files, or include files. The URLs are fetched and processed by cloud-init in the order they appear in the list13.
* cloud-config declarations in YAML: Cloud-init can process user-data that is formatted as a cloud-config file, which is a YAML document that contains declarations for various cloud-init modules. The cloud-config file can specify various aspects of the instance configuration, such as hostname, users, packages, commands, services, and more. The cloud-config file must start with the #cloud-config header14.
The other kinds of data listed in the question are not directly processed by cloud-init from user-data. They are either not supported, not recommended, or require additional steps to be processed. These kinds of data are:
* ISO images to boot from: Cloud-init does not support booting from ISO images that are passed as user-data. ISO images are typically used to install an operating system on a physical or virtual machine, not to customize an existing cloud instance. To boot from an ISO image, the user would need to attach it as a secondary disk to the instance and configure the boot order accordingly5.
* Base64-encoded binary files to execute: Cloud-init does not recommend passing binary files as user-data, as they may not be compatible with the instance's architecture or operating system.
Base64-encoding does not change this fact, as it only converts the binary data into ASCII characters. To execute a binary file, the user would need to decode it and make it executable on the instance6.
References:
* User-Data Formats - cloud-init 22.1 documentation
* User-Data Scripts
* Include File
* Cloud Config
* How to Boot From ISO Image File Directly in Windows
* How to run a binary file as a command in the terminal?.


NEW QUESTION # 20
If aDockerfilecontains the following lines:
WORKDIR /
RUN cd /tmp
RUN echo test > test
where is the filetestlocated?

  • A. /tmp/test on the system running docker build.
  • B. /root/tesc within the container image.
  • C. /ting/test within the container image.
  • D. /test within the container image.
  • E. test in the directory holding the Dockerf ile.

Answer: D

Explanation:
Explanation
The WORKDIR instruction sets the working directory for any subsequent RUN, CMD, ENTRYPOINT, COPY and ADD instructions that follow it in the Dockerfile1. The RUN instruction executes commands in a new layer on top of the current image and commits the results2. The RUN cd command does not change the working directory for the next RUN instruction, because each RUN command runs in a new shell and a new environment3. Therefore, the file test is created in the root directory (/) of the container image, not in the /tmp directory. References:
* Dockerfile reference: WORKDIR
* Dockerfile reference: RUN
* difference between RUN cd and WORKDIR in Dockerfile


NEW QUESTION # 21
......

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