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NEW QUESTION # 69
Which of the following statements about the commandlxc-checkpointis correct?
Answer: C
Explanation:
Explanation
The command lxc-checkpoint is used to checkpoint and restore containers. Checkpointing a container means saving the state of the container, including its memory, processes, file descriptors, and network connections, to a file or a directory. Restoring a container means resuming the container from the saved state, as if it was never stopped. Checkpointing and restoring containers can be useful for various purposes, such as live migration, backup, debugging, or snapshotting. The command lxc-checkpoint has the following syntax:
lxc-checkpoint {-n name} {-D path} [-r] [-s] [-v] [-d] [-F]
The options are:
* -n name: Specify the name of the container to checkpoint or restore.
* -D path: Specify the path to the file or directory where the checkpoint data is dumped or restored.
* -r, --restore: Restore the checkpoint for the container, instead of dumping it. This option is incompatible with -s.
* -s, --stop: Optionally stop the container after dumping. This option is incompatible with -r.
* -v, --verbose: Enable verbose criu logging. Only available when providing -r.
* -d, --daemon: Restore the container in the background (this is the default). Only available when providing -r.
* -F, --foreground: Restore the container in the foreground. Only available when providing -r.
The command lxc-checkpoint uses the CRIU (Checkpoint/Restore In Userspace) tool to perform the checkpoint and restore operations. CRIU is a software that can freeze a running application (or part of it) and checkpoint it to a hard drive as a collection of files. It can then use the files to restore and run the application from the point it was frozen at1.
The other statements about the command lxc-checkpoint are not correct. It does not create a clone or an image of a container, nor does it double the memory consumptionof the container. It can work on both running and stopped containers, depending on the options provided. References:
* Linux Containers - LXC - Manpages - lxc-checkpoint.12
* lxc-checkpoint(1) - Linux manual page - man7.org3
* CRIU4
NEW QUESTION # 70
How can data be shared between several virtual machines running on the same Linux-based host system?
Answer: B
Explanation:
The correct way to share data between several virtual machines running on the same Linux-based host system is by using a network file system or file transfer protocol. A network file system (NFS) is a distributed file system protocol that allows a user on a client computer to access files over a network in a manner similar to how local storage is accessed1. A file transfer protocol (FTP) is a standard network protocol used for the transfer of computer files between a client and server on a computer network2. Both methods allow data to be shared between virtual machines regardless of their underlying file systems or virtualization technologies. The other options are incorrect because they either do not work or are not feasible. Option A is wrong because each virtual machine has its own file system that is not directly accessible by other virtual machines. Option B is wrong because there is no such device as /dev/virt-disks/remote/ that can be used to mount other virtual machines' file systems. Option C is wrong because a ramdisk is a volatile storage device that is not suitable for sharing data between virtual machines. Option E is wrong because attaching the same virtual hard disk to multiple virtual machines can cause data corruption and conflicts, and EXT4 does not have any sharing extensions that can prevent this. References:https://kb.vmware.com/s/article/1012706
https://bing.com/search?q=data+sharing+between+virtual+machines
NEW QUESTION # 71
What is the primary purpose of Vagrant's "Vagrantfile" configuration file?
Answer: C
Explanation:
TheVagrantfileis the core configuration file used by Vagrant to define and control virtual machine environments. According to Vagrant documentation, its primary purpose is todescribe the virtual machine configuration, including hardware-related settings such as memory size, CPU count, networking, synced folders, and provisioning instructions.
The Vagrantfile allows developers to declare VM characteristics in a reproducible and portable way, ensuring consistent development environments across teams. While it can also reference providers and provisioning tools, its fundamental role is defining how the virtual machine should be created and configured.
Options B and C are unrelated to Vagrant's purpose, and option D is too narrow, as Vagrantfile usage is not limited to cloud providers.
Therefore, the correct answer isA.
NEW QUESTION # 72
Virtualization of which hardware component is facilitated by CPUs supporting nested page table extensions, such as Intel Extended Page Table (EPT) or AMD Rapid Virtualization Indexing (RVI)?
Answer: B
NEW QUESTION # 73
Which of the following statements are true regarding VirtualBox?
Answer: D
NEW QUESTION # 74
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