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| Section | Weight | Objectives |
|---|---|---|
| VM Deployment and Provisioning | 12% | - cloud-init - Vagrant - Packer - Cloud Management Tools |
| Full Virtualization | 25% | - Virtual Machine Disk Image Management - Libvirt Virtual Machine Management - QEMU - Virtualization Concepts and Theory - Xen |
| Container Virtualization | 25% | - LXC - Container Virtualization Concepts - Container Orchestration Platforms - Docker |
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NEW QUESTION # 45
What is the purpose of a .dockerignore file?
Answer: C
NEW QUESTION # 46
Which of the following commands deletes all volumes which are not associated with a container?
Answer: B
Explanation:
Explanation
The command that deletes all volumes which are not associated with a container is docker volume prune. This command removes all unused local volumes, which are those that are not referenced by any containers. By default, it only removes anonymous volumes, which are those that are not given a specific name when they are created. To remove both unused anonymous and named volumes, the --all or -a flag can be added to the command. The command will prompt for confirmation before deleting the volumes, unless the --force or -f flag is used to bypass the prompt. The command will also show the total reclaimed space after deleting the volumes12.
The other commands listed in the question are not valid or do not have the same functionality as docker volume prune. They are either made up, misspelled, or have a different purpose. These commands are:
* docker volume cleanup: This command does not exist in Docker. There is no cleanup subcommand for docker volume.
* docker volume orphan -d: This command does not exist in Docker. There is no orphan subcommand for docker volume, and the -d flag is not a valid option for any docker volume command.
* docker volume vacuum: This command does not exist in Docker. There is no vacuum subcommand for docker volume.
* docker volume garbage-collect: This command does not exist in Docker. There is no garbage-collect subcommand for docker volume.
References:
* docker volume prune | Docker Docs
* How to Remove all Docker Volumes - YallaLabs.
NEW QUESTION # 47
Which container orchestration platform is often associated with automated scaling and load balancing?
Answer: D
Explanation:
Kubernetesis the container orchestration platform most strongly associated withautomated scaling and load balancing. According to container orchestration documentation, Kubernetes provides built-in features such as Horizontal Pod Autoscaling, service-based load balancing, self-healing, and declarative deployment models.
Docker Compose and LXC are not orchestration platforms at scale, and while Amazon ECS supports scaling, Kubernetes is the industry-standard platform most commonly referenced for these capabilities.
Therefore, the correct answer isB.
NEW QUESTION # 48
Which directory is used bycloud-initto store status information and configuration information retrieved from external sources?
Answer: B
Explanation:
Explanation
cloud-init uses the /var/lib/cloud/ directory to store status information and configuration information retrieved from external sources, such as the cloud platform'smetadata service or user data files. The directory contains subdirectories for different types of data, such as instance, data, handlers, scripts, and sem. The instance subdirectory contains information specific to the current instance, such as the instance ID, the user data, and the cloud-init configuration. The data subdirectory contains information about the data sources that cloud-init detected and used. The handlers subdirectory contains information about the handlers that cloud-init executed.
The scripts subdirectory contains scripts that cloud-init runs at different stages of the boot process, such as per-instance, per-boot, per-once, and vendor. The sem subdirectory contains semaphore files that cloud-init uses to track the execution status of different modules and stages. References:
* Configuring and managing cloud-init for RHEL 8 - Red Hat Customer Portal
* vsphere - what is the linux file location where the cloud-init user ...
NEW QUESTION # 49
What does LXC stand for?
Answer: B
Explanation:
LXCstands forLinux Containers, a lightweight virtualization technology that enables multiple isolated Linux systems (containers) to run on a single Linux host. Virtualization and containerization documentation describes LXC as acontainer-based virtualization solutionthat uses Linux kernel features such as namespaces, control groups (cgroups), and capabilitiesto provide process isolation without requiring a full hypervisor.
Unlike traditional virtual machines, LXC containers share the host kernel, which significantly reduces overhead and improves performance. Each container behaves like an independent Linux system with its own process tree, network interfaces, and filesystem, while still relying on the host kernel for execution.
LXC is often referred to as"system containers", as it allows running full Linux distributions inside containers, unlike application-focused containers such as Docker. It serves as the foundation for higher-level container platforms, includingLXD, which provides enhanced management features and APIs.
The other options are incorrect because they do not align with established Linux container terminology.
Official Linux container documentation consistently defines LXC asLinux Containers, making optionBthe correct answer.
NEW QUESTION # 50
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