LPI 305-300 PDF QUESTIONS EXAM PREPARATION AND STUDY GUIDE

Lpi 305-300 PDF Questions Exam Preparation and Study Guide

Lpi 305-300 PDF Questions Exam Preparation and Study Guide

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Lpi 305-300 (LPIC-3 Exam 305: Virtualization and Containerization) is a certification exam designed to test the knowledge and skills of IT professionals in the field of virtualization and containerization. 305-300 Exam is intended for professionals who have advanced knowledge and experience in this area and who want to demonstrate their proficiency to potential employers or clients.

Lpi LPIC-3 Exam 305: Virtualization and Containerization Sample Questions (Q20-Q25):

NEW QUESTION # 20
Which of the following values would be valid in the FROM statement in aDockerfile?

  • A. docker://ubuntu: focal
  • B. file:/tmp/ubuntu/Dockerfile
  • C. registry:ubuntu:focal
  • D. ubuntu:focal
  • E. http://docker.example.com/images/ubuntu-focal.iso

Answer: D

Explanation:
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
Which functionality is provided by Vagrant as well as by Docker? (Choose three.)

  • A. Both start system images as virtual machines instead of containers bv default.
  • B. Both can apply changes to a base image.
  • C. Both can download required base images.
  • D. Both start system images as containers instead of virtual machines by default.
  • E. Both can share directories from the host file system to a guest.

Answer: B,C,E


NEW QUESTION # 22
Which of the following values are valid in thefirmwareattribute of a<os>element in a libvirt domain definition? (Choose two.)

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

Answer: B,E


NEW QUESTION # 23
The commandvirsh vol-list vmsreturns the following error:
error: failed to get pool 'vms'
error: Storage pool not found: no storage pool with matching name 'vms ' Given that the directory/vmsexists, which of the following commands resolves this issue?

  • A. qemu-img pool vms:/vms
  • B. libvirt-poolctl new --name=/vms --type=dir --path=/vms
  • C. dd if=/dev/zero of=/vms bs=1 count=0 flags=name:vms
  • D. virsh pool-create-as vms dir --target /vms
  • E. touch /vms/.libvirtpool

Answer: D

Explanation:
Explanation
The command virsh pool-create-as vms dir --target /vms creates and starts a transient storage pool named vms of type dir with the target directory /vms12. This command resolves the issue of the storage pool not found error, as it makes the existing directory /vms visible to libvirt as a storage pool. The other commands are invalid because:
* dd if=/dev/zero of=/vms bs=1 count=0 flags=name:vms is not a valid command syntax. The dd command does not take a flags argument, and the output file /vms should be a regular file, not a directory3.
* libvirt-poolctl new --name=/vms --type=dir --path=/vms is not a valid command name. There is no such command as libvirt-poolctl in the libvirt package4.
* qemu-img pool vms:/vms is not a valid command syntax. The qemu-img command does not have a pool subcommand, and the vms:/vms argument is not a valid image specification5.
* touch /vms/.libvirtpool is not a valid command to create a storage pool. The touch command only creates an empty file, and the .libvirtpool file is not recognized by libvirt as a storage pool configuration file6.
References:
* 1: virsh - difference between pool-define-as and pool-create-as - Stack Overflow
* 2: dd(1) - Linux manual page - man7.org
* 3: 12.3.3. Creating a Directory-based Storage Pool with virsh - Red Hat Customer Portal
* 4: libvirt - Linux Man Pages (3)
* 5: qemu-img(1) - Linux manual page - man7.org
* 6: touch(1) - Linux manual page - man7.org


NEW QUESTION # 24
Which of the following devices exist by default in an LXC container? (Choose three.)

  • A. /dev/root
  • B. /dev/log
  • C. /dev/kmem
  • D. /dev/console
  • E. /dev/urandom

Answer: B,D,E

Explanation:
Explanation
LXC (Linux Containers) is a lightweight virtualization technology that allows multiple isolated Linux systems (containers) to run on the same host. LXC uses Linux kernel features such as namespaces, cgroups, and AppArmor to create and manage containers. Each container has its own file system, network interfaces, process tree, and resource limits. However, containers share the same kernel and hardware with the host, which makes them more efficient and faster than full virtualization.
By default, an LXC container has a minimal set of devices that are needed for its operation. These devices are created by the LXC library when the container is started, and are removed when the container is stopped. The default devices are:
* /dev/log: This is a Unix domain socket that connects to the syslog daemon on the host. It allows the container to send log messages to the host's system log1.
* /dev/console: This is a character device that provides access to the container's console. It is usually connected to the host's terminal or a file. It allows the container to interact with the user or the host's init system12.
* /dev/urandom: This is a character device that provides an unlimited source of pseudo-random numbers. It is used by various applications and libraries that need randomness, such as cryptography, UUID generation, and hashing13.
The other devices listed in the question do not exist by default in an LXC container. They are either not needed, not allowed, or not supported by the container's namespace or cgroup configuration. These devices are:
* /dev/kmem: This is a character device that provides access to the kernel's virtual memory. It is not needed by the container, as it can access its own memory through the /proc filesystem. It isalso not allowed by the container, as it would expose the host's kernel memory and compromise its security4.
* /dev/root: This is a symbolic link that points to the root device of the system. It is not supported by the container, as it does not have a separate root device from the host. The container's root file system is mounted from a directory, an image file, or a loop device on the host5.
References:
* Linux Containers - LXC - Manpages - lxc.container.conf.5
* Linux Containers - LXC - Getting started
* Random number generation - Wikipedia
* /dev/kmem - Wikipedia
* Linux Containers - LXC - Manpages - lxc.container.conf.5


NEW QUESTION # 25
......

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