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| Section | Weight | Objectives |
|---|---|---|
| Container Virtualization | 25% | - Container Virtualization Concepts - LXC - Container Orchestration Platforms - Docker |
| VM Deployment and Provisioning | 12% | - cloud-init - Cloud Management Tools - Vagrant - Packer |
| Full Virtualization | 25% | - Xen - Virtualization Concepts and Theory - QEMU - Virtual Machine Disk Image Management - Libvirt Virtual Machine Management |
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NEW QUESTION # 11
What is the same of the global configuration file for the xl tool stack?
Answer:
Explanation:
/etc/xen/xl.conf
Explanation:
Thexl toolstackis the modern command-line management interface used for administering theXen hypervisor
, replacing the older xm toolstack. According to official Xen virtualization documentation, theglobal configuration filefor the xl toolstack is/etc/xen/xl.conf.
This configuration file definesdefault behaviors and policiesfor the xl management commands. It allows administrators to configure global settings such as default CPU scheduling behavior, memory handling, device model settings, and other operational parameters that affect how virtual machines (domains) are managed on a Xen host. These settings apply system-wide and influence the behavior of all xl commands unless overridden by per-domain configuration files.
The file /etc/xen/xl.conf is read by the xl toolstack at runtime and is part of the standard Xen configuration directory structure. Individual virtual machine definitions are typically stored as separate configuration files in
/etc/xen/, but xl.conf serves as thecentral, global configuration reference.
Virtualization notes emphasize that proper configuration of xl.conf is important for performance tuning, stability, and compliance in Xen-based environments. While many default installations function correctly without modifying this file, enterprise deployments often customize it to align with workload requirements and hardware capabilities.
Therefore, the correct and documented global configuration file for the xl toolstack is/etc/xen/xl.conf.
NEW QUESTION # 12
Which of the following mechanisms are used by LXC and Docker to create containers? (Choose three.)
Answer: A,B,E
Explanation:
Explanation
LXC and Docker are both container technologies that use Linux kernel features to create isolated environments for running applications. The main mechanisms that they use are:
* Linux Capabilities: These are a set of privileges that can be assigned to processes to limit their access to certain system resources or operations. For example, a process with the CAP_NET_ADMIN capability can perform network administration tasks, such as creating or deleting network interfaces. Linux
* capabilities allow containers to run with reduced privileges, enhancing their security and isolation.
* Kernel Namespaces: These are a way of creating separate views of the system resources for different processes. For example, a process in a mount namespace can have a different file system layout than the host or other namespaces. Kernel namespaces allow containers to have their own network interfaces, process IDs, user IDs, and other resources, without interfering with the host or other containers.
* Control Groups: These are a way of grouping processes and applying resource limits and accounting to them. For example, a control group can limit the amount of CPU, memory, disk I/O, or network bandwidth that a process or a group of processes can use. Control groups allow containers to have a fair share of the system resources and prevent them from exhausting the host resources.
POSIX ACLs and file system permissions are not mechanisms used by LXC and Docker to create containers.
They are methods of controlling the access to files and directories on a file system, which can be applied to any process, not just containers.
References:
* LXC vs Docker: Which Container Platform Is Right for You?
* LXC vs Docker: Why Docker is Better in 2023 | UpGuard
* What is the Difference Between LXC, LXD and Docker Containers
* lxc - Which container implementation docker is using - Unix & Linux Stack Exchange
NEW QUESTION # 13
Which of the following commands deletes all volumes which are not associated with a container?
Answer: D
NEW QUESTION # 14
How does cloud-init enhance the customization of cloud instances?
Answer: B
Explanation:
Cloud-init enhances cloud instance customization by allowing users to provideuser data and scriptsthat are executed during thefirst bootof an instance. According to cloud-init documentation, these scripts and configuration files enable tasks such as installing packages, configuring services, setting hostnames, managing users, and injecting SSH keys.
Cloud-init does not automatically configure every aspect of an instance, nor does it provide a graphical interface. It also does not directly integrate with containerization tools. Its strength lies inautomation and repeatability, making instance initialization consistent across environments.
Thus, the correct answer isB.
NEW QUESTION # 15
What is a container image?
Answer: B
Explanation:
Acontainer imageis astatic, immutable packagethat contains an application along with all its required dependencies, libraries, and configuration files. Containerization documentation defines a container image as a snapshot of an application and its runtime environment, which can be instantiated as a running container.
Container images do not include a full operating system kernel; instead, containers share the host system's kernel. This design makes containers lightweight and fast to deploy compared to traditional virtual machines.
Therefore, the correct answer isC.
NEW QUESTION # 16
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