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| Section | Weight | Objectives |
|---|---|---|
| Full Virtualization | 25% | - Libvirt Virtual Machine Management
|
| VM Deployment and Provisioning | 10% | - Cloud Init
|
| Container Virtualization | 25% | - Docker
|
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NEW QUESTION # 78
Where are paravirtualized device drivers installed?
Answer: D
Explanation:
Paravirtualization is a virtualization technique where the guest operating system is aware that it is running in a virtualized environment and cooperates directly with the hypervisor. According to Xen and virtualization documentation, this cooperation is achieved through paravirtualized device drivers, which must be installed inside the guest operating system.
These specialized drivers replace traditional hardware drivers and communicate directly with the hypervisor using optimized interfaces. This reduces the overhead of hardware emulation and improves performance, particularly for disk and network I/O. Because of this design, the guest OS must either be modified or explicitly include support for paravirtualized drivers.
Option B is incorrect because paravirtualization explicitly requires special guest-side drivers. Option C is incorrect because drivers are not compiled into the hypervisor; they reside in the guest. Option D is also incorrect because host OS drivers do not provide paravirtualized functionality to guests.
Virtualization notes consistently state that paravirtualized drivers are installed and run within the guest OS, making option A the correct answer.
NEW QUESTION # 79
Which of the following values are valid in thefirmwareattribute of a<os>element in a libvirt domain definition?(Choose two.)
Answer: B,E
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 # 80
Which functionality is provided by Vagrant as well as by Docker? (Choose three.)
Answer: A,D,E
Explanation:
* Both Vagrant and Docker can share directories from the host file system to a guest. This allows the guest to access files and folders from the host without copying them. Vagrant uses the config.vm.
synced_folder option in the Vagrantfile to specify the shared folders1. Docker uses the -v or -- volume flag in the docker run command to mount a host directory as a data volume in the container2.
* Both Vagrant and Docker can download required base images. Base images are the starting point for creating a guest environment. Vagrant uses the config.vm.box option in the Vagrantfile to specify the base image to use1. Docker uses the FROM instruction in the Dockerfile to specify the base image to use2. Both Vagrant and Docker can download base images from public repositories or local sources.
* Both Vagrant and Docker can apply changes to a base image. Changes are modifications or additions to the base image that customize the guest environment. Vagrant uses provisioners to run scripts or commands on the guest after it is booted1. Docker uses instructions in the Dockerfile to execute commands on the base image and create a new image2. Both Vagrant and Docker can save the changes to a new image or discard them after the guest is destroyed.
* Vagrant and Docker differ in how they start system images. Vagrant starts system images as virtual machines by default, using a provider such as VirtualBox, VMware, or Hyper-V1. Docker starts system images as containers by default, using the native containerization functionality on macOS, Linux, and Windows2. Containers are generally more lightweight and faster than virtual machines, but less secure and flexible. References: 1: Vagrant vs. Docker | Vagrant | HashiCorp Developer 2: Vagrant vs Docker: Which Is Right for You? (Could Be Both) - Kinsta Web Development Tools
NEW QUESTION # 81
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: C
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 # 82
Which file in acgroupdirectory contains the list of processes belonging to thiscgroup?
Answer: D
Explanation:
The file procs in a cgroup directory contains the list of processes belonging to this cgroup. Each line in the file shows the PID of a process that is a member of the cgroup. A process can be moved to a cgroup by writing its PID into the cgroup's procs file. For example, to move the process with PID 24982 to the cgroup cg1, the following command can be used: echo 24982 > /sys/fs/cgroup/cg1/procs1. The file procs is different from the file tasks, which lists the threads belonging to the cgroup. The file procs can be used to move all threads in a thread group at once, while the file tasks can be used to move individual threads2. References:
* Creating and organizing cgroups cgroup2 - GitHub Pages
* Control Groups - The Linux Kernel documentation
NEW QUESTION # 83
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