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Lpi LPIC-3 Exam 305: Virtualization and Containerization Sample Questions (Q38-Q43):
NEW QUESTION # 38
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?
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 # 39
Which command in the KVM monitor restores a snapshot?
Answer:
Explanation:
loadvm
Explanation:
In KVM and QEMU-based virtualization environments, the QEMU monitor provides an interactive interface for managing virtual machine runtime operations. According to KVM documentation, the command used to restore a previously saved snapshot within the monitor is loadvm.
Snapshots capture the state of a virtual machine at a specific point in time, including CPU state, memory, and disk state (depending on configuration). The loadvm command allows administrators to revert a virtual machine back to that saved state, which is especially useful for testing, debugging, and recovery scenarios.
This command is typically used in conjunction with the savevm command, which creates snapshots. The functionality is supported primarily with disk formats such as QCOW2, which allow snapshot capabilities.
Therefore, the correct and documented command is loadvm.
NEW QUESTION # 40
What is Docker Hub?
Answer: A
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 # 41
Which of the following are true regarding the CPU of a QEMU virtual machine? (Choose two.)
Answer: C,E
Explanation:
Explanation
The CPU architecture of a QEMU virtual machine is independent of the host system's architecture. QEMU can emulate many CPU architectures, including x86, ARM, Alpha, and SPARC, regardless of the host system's architecture1. This allows QEMU to run guest operating systems that are not compatible with the host system's hardware. Therefore, option A is correct. QEMU virtual machines support multiple virtual CPUs in order to run SMP systems. QEMU uses the concept of virtual CPUs (vCPUs) to map the virtual machines to physical CPUs. Each vCPU is a thread that runs on a physical CPU core. QEMU allows the user to specify the number of vCPUs and the CPU model for each virtual machine. QEMU can run SMP systems with multiple vCPUs, as well as single-processor systems with one vCPU2. Therefore, option E is also correct. The other options are incorrect because they do not describe the CPU of a QEMU virtual machine. Option B is wrong because QEMU virtual machines can have more than one CPU with more than one core. Option C is wrong because QEMU does not require a dedicated physical CPU core for each virtual machine. QEMU can share the physical CPU cores among multiple virtual machines, depending on the load and the scheduling policy.
Option D is wrong because QEMU does not use the term CPU, but vCPU, to refer to the virtual machines' processors. References:
* QEMU vs VirtualBox: What's the difference? - LinuxConfig.org
* QEMU / KVM CPU model configuration - QEMU documentation
* Introduction - QEMU documentation
* Qemu/KVM Virtual Machines - Proxmox Virtual Environment
NEW QUESTION # 42
In order to determine if a virtualization host offers Intel VT-x support, which CPU flag must be searched for in the file /proc/cpuinfo?
Answer:
Explanation:
vmx
Explanation:
Intel VT-x is Intel's hardware-assisted virtualization technology and is required to run hypervisors such as KVMefficiently. According to Linux and KVM documentation, support for Intel VT-x can be verified by checking the CPU flags listed in the /proc/cpuinfo file.
The specific flag that indicates Intel VT-x support isvmx. This flag appears in the flags section for each processor core if VT-x is available and enabled in the system firmware (BIOS or UEFI). The presence of vmx confirms that the CPU supports hardware virtualization extensions required by KVM.
If the flag is absent, virtualization may either be unsupported by the CPU or disabled in the firmware settings.
For AMD processors, a different flag (svm) is used.
Virtualization documentation consistently references the vmx flag as the authoritative indicator for Intel VT-x support. Therefore, the correct and documented answer isvmx.
NEW QUESTION # 43
......
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