305-300 Practice Test 13 — 15 Questions

Question 1

You are using QEMU to emulate an ARM architecture on an x86_64 host. You need to ensure the guest has access to the host's filesystem directly without configuring network shares. Which option is the correct way to pass a directory through to the guest?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

-virtfs local,path=/data,mount_tag=host_data,security_model=passthrough. The virtio-9p-pci device allows for high-performance filesystem passthrough between the host and guest in QEMU.

Answer

-fsdev share,path=/data,id=host_data

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-netdev user,hostfwd=dir:/data

Answer

-drive file=/data,format=raw,if=virtio

Question 2

When using Vagrant to manage a libvirt-based provider, which command verifies that the virtual machine is currently running and identifies the provider in use?

Accepted Answer

vagrant status. 'vagrant status' provides the current state of the machine and the provider used for that specific instance.

Answer

vagrant up

Answer

vagrant validate

Answer

vagrant box list

Question 3

In cloud-init, which syntax is required at the very beginning of the configuration file to ensure it is recognized as a cloud-config script?

Accepted Answer

#cloud-config. Cloud-init scripts must start with the '#cloud-config' directive to be correctly parsed as YAML configuration.

Answer

#!/bin/bash

Answer

#cloud-init

Answer

---

Question 4

You are troubleshooting a libvirt migration that fails with 'Operation not supported: Migration requires a storage pool'. You need to perform a block migration where the storage is copied to the destination host. Which command-line flag enables this functionality?

Accepted Answer

--copy-storage-all. The --copy-storage-all flag in 'virsh migrate' instructs libvirt to copy all non-shared disk images to the destination host.

Answer

--live-disk

Answer

--migrate-storage

Answer

--block-migrate

Question 5

Which cloud-init module is responsible for setting the hostname of the instance during the initial boot process?

Accepted Answer

hostname. The 'hostname' module in cloud-init is designed to update the system hostname based on the provided configuration.

Answer

system_name

Answer

network_config

Answer

set_hostname

Question 6

When migrating a domain with virsh, which TWO of the following options can be used to ensure the migration is successful if the destination host has a different CPU architecture or feature set?

Accepted Answer

--cpu-mode host-model. The '--cpu-mode' and '--migrate-disks' related flags help handle compatibility during migration.

Answer

--persistent

Answer

--undefine-source

Answer

--live

Question 7

When using Packer with the QEMU builder, what does the 'format' option in the 'qemu' builder define?

Accepted Answer

The output image format. The 'format' parameter specifies the image format to be produced, such as 'qcow2' or 'raw'.

Answer

The filesystem type

Answer

The hypervisor type

Answer

The guest OS type

Question 8

Which THREE of the following are necessary components for a successful KVM virtualization environment on Linux?

Accepted Answer

The kvm kernel module. KVM requires hardware virtualization support, the kernel module, and the QEMU userspace interface.

Answer

A dedicated storage network switch

Answer

A full Xen hypervisor installed

Question 9

In a Packer build process for OpenStack, which 'post-processor' type is typically used to upload the resulting image to the Glance image service?

Accepted Answer

openstack. The 'openstack' post-processor is designed to handle the registration of the image into the OpenStack Glance service.

Answer

manifest

Answer

shell-local

Answer

compress

Question 10

In a Vagrantfile, which method is used to pass environment variables into the guest virtual machine during the provisioning phase?

Accepted Answer

config.vm.provision "shell", env: { "VAR" => "value" }. The 'config.vm.provision "shell"' block accepts an 'env' hash to define environment variables for the shell script.

Answer

config.env.set

Answer

config.vm.env

Answer

vagrant.env.set

Question 11

What is the primary function of the cloud-init 'runcmd' module?

Accepted Answer

Running arbitrary shell commands. The 'runcmd' module is used to execute arbitrary shell commands during the boot process of an instance.

Answer

Setting the system locale

Answer

Configuring users

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Installing software packages

Question 12

Which command is used to display the configuration of a Packer build in a readable format?

Accepted Answer

packer inspect. 'packer inspect' is used to view information about a template, including variables and provisioners.

Answer

packer view

Answer

packer show

Answer

packer list

Question 13

You need to ensure that a specific package is installed during the first boot of a cloud instance. Which cloud-init key should be added to the configuration?

Accepted Answer

packages. The 'packages' list under cloud-init config allows specifying a list of packages to be installed by the system package manager.

Answer

yum_install

Answer

software

Answer

install_packages

Question 14

Which tool is commonly used alongside Packer to validate the configuration file for syntax errors before attempting a build?

Accepted Answer

packer validate. 'packer validate' is the built-in command to check for syntax and configuration errors in Packer files.

Answer

packer fmt

Answer

packer lint

Answer

packer check

Question 15

Which THREE settings are commonly configured in the 'provider' block of a Vagrantfile for virtualbox?

Accepted Answer

gui. The 'provider' block for VirtualBox allows setting memory, CPU count, and enabling GUI mode.

Answer

disk_size

Answer

network_type