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305-300 Latest Test Sample - New 305-300 Exam Preparation

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Lpi LPIC-3 Exam 305: Virtualization and Containerization Sample Questions (Q51-Q56):

NEW QUESTION # 51
Which of the following statements about the commandlxc-checkpointis correct?

A. It writes the status of the container to a file.
B. It creates a clone of a container.
C. It only works on stopped containers.
D. It creates a container image based on an existing container.
E. It doubles the memory consumption of the container.

Answer: A

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 # 52
FILL BLANK
What command is used to run a process in a new Linux namespace? (Specify ONLY the command without any path or parameters.)

Answer:

Explanation:
unshare

NEW QUESTION # 53
When using Packer to create machine images, what are some common sources for base images? (Select all that apply)

A. Custom images created by the organization
B. Official operating system images
C. Physical servers
D. Images from untrusted sources

Answer: A,B

Explanation:
Packer is an image automation tool used to create identical machine images for multiple platforms from a single configuration. According to virtualization and containerization documentation, Packer typically uses trusted and standardized base imagesas the starting point for image creation. The most common sources includeofficial operating system imagesprovided by vendors such as Red Hat, Ubuntu, or cloud service providers, andcustom images created internally by an organization.
Using official images ensures that the base system is secure, properly maintained, and compliant with vendor standards. Organizations often build custom base images to enforce internal security policies, hardening standards, and preinstalled software, which Packer then extends into environment-specific images.
Physical servers are not considered common or practical base sources for Packer, as Packer operates on machine image artifacts rather than cloning live hardware systems. Images from untrusted sources are explicitly discouraged in virtualization documentation due to security and compliance risks.
Therefore, documentation clearly supportscustom organizational imagesandofficial operating system imagesas the correct and recommended base sources for Packer image creation.

NEW QUESTION # 54
Which of the following commands lists all differences between the disk images vm1-snap.img and vm1.img?

A. virt-delta -a vm1-snap.img -A vm1.img
B. virt-cmp -a vm1-snap.img -A vm1.img
C. virt-cp-in -a vm1-snap.img -A vm1.img
D. virt-history -a vm1-snap.img -A vm1.img
E. virt-diff -a vm1-snap.img -A vm1.img

Answer: E

Explanation:
Explanation
The virt-diff command-line tool can be used to list the differences between files in two virtual machines or disk images. The output shows the changes to a virtual machine's disk images after it has been running. The command can also be used to show the difference between overlays1. To specify two guests, you have to use the -a or -d option for the first guest, and the -A or -D option for the second guest. For example: virt-diff -a old.img -A new.img1. Therefore, the correct command to list all differences between the disk images vm1-snap.img and vm1.img is: virt-diff -a vm1-snap.img -A vm1.img. The other commands are not related to finding differences between disk images. virt-delta is a tool to create delta disks from two disk images2. virt-cp-in is a tool to copy files and directories into a virtual machine disk image3. virt-cmp is a tool to compare two files or directories in a virtual machine disk image4. virt-history is a tool to show the history of a virtual machine disk image5. References:
* 21.13. virt-diff: Listing the Differences between Virtual Machine Files ...
* 21.14. virt-delta: Creating Delta Disks from Two Disk Images ...
* 21.6. virt-cp-in: Copying Files and Directories into a Virtual Machine Disk Image ...
* 21.7. virt-cmp: Comparing Two Files or Directories in a Virtual Machine Disk Image ...
* 21.8. virt-history: Showing the History of a Virtual Machine Disk Image ...

NEW QUESTION # 55
Which of the following statements about the commandlxc-checkpointis correct?

A. It writes the status of the container to a file.
B. It creates a clone of a container.
C. It only works on stopped containers.
D. It creates a container image based on an existing container.
E. It doubles the memory consumption of the container.

Answer: A

NEW QUESTION # 56
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