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Lpi 305-300 Fragen und Antworten, LPIC-3 Exam 305: Virtualization and Containerization Prüfungsfragen

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Lpi LPIC-3 Exam 305: Virtualization and Containerization 305-300 Prüfungsfragen mit Lösungen (Q51-Q56):

51. Frage
Ifdocker stackis to be used to run a Docker Compose file on a Docker Swarm, how are the images referenced in the Docker Compose configuration made available on the Swarm nodes?

A. docker stack passes the images to the Swarm master which distributes the images to all other Swarm nodes.
B. docker stack instructs the Swarm nodes to pull the images from a registry, although it does not upload the images to the registry.
C. docker stack triggers the build process for the images on all nodes of the Swarm.
D. docker stack builds the images locally and copies them to only those Swarm nodes which run the service.
E. docker stack transfers the image from its local Docker cache to each Swarm node.

Antwort: B

Begründung:
Docker stack is a command that allows users to deploy and manage a stack of services on a Docker Swarm cluster. A stack is a group of interrelated services that share dependencies and can be orchestrated and scaled together. A stack is typically defined by a Compose file, which is a YAML file that describes the services, networks, volumes, and other resources of the stack. To use docker stack to run a Compose file on a Swarm, the user must first create and initialize a Swarm cluster, which is a group of machines (nodes) that are running the Docker Engine and are joined into a single entity. The Swarm cluster has one or more managers, which are responsible for maintaining the cluster state and orchestrating the services, and one or more workers, which are the nodes that run the services.
When the user runs docker stack deploy with a Compose file, the command parses the file and creates the services as specified. However, docker stack does not build or upload the images referenced in the Compose file to any registry. Instead, it instructs the Swarm nodes to pull the images from a registry, which can be the public Docker Hub or a private registry. The user must ensure that the images are available in the registry before deploying the stack, otherwise the deployment will fail. The user can use docker build and docker push commands to create and upload the images to the registry, or use an automated build service such as Docker Hub or GitHub Actions. The user must also make sure that the image names and tags in the Compose file match the ones in the registry, and that the Swarm nodes have access to the registry if it is private. By pulling the images from a registry, docker stack ensures that the Swarm nodes have the same and latest version of the images, and that the images are distributed across the cluster in an efficient way.
The other options are not correct. Docker stack does not build the images locally or on the Swarm nodes, nor does it copy or transfer the images to the Swarm nodes. Docker stack also does not pass the images to the Swarm master, as this would create a bottleneck and a single point of failure. Docker stack relies on the registry as the source of truth for the images, and delegates the image pulling to the Swarm nodes. References:
* Deploy a stack to a swarm | Docker Docs1
* docker stack deploy | Docker Docs2
* docker build | Docker Docs3
* docker push | Docker Docs4

52. Frage
What is the purpose of capabilities in the context of container virtualization?

A. Prevent processes from performing actions which might infringe the container.
B. Map potentially dangerous system calls to an emulation layer provided by the container virtualization.
C. Enable memory deduplication to cache files which exist in multiple containers.
D. Allow regular users to start containers with elevated permissions.
E. Restrict the disk space a container can consume.

Antwort: A

Begründung:
Explanation
Capabilities are a way of implementing fine-grained access control in Linux. They are a set of flags that define the privileges that a process can have. By default, a process inherits the capabilities of its parent, but some capabilities can be dropped or added by the process itself or by the kernel. In the context of container virtualization, capabilities are used to prevent processes from performing actions that might infringe the container, such as accessing the host's devices, mounting filesystems, changing the system time, or killing other processes. Capabilities allow containers to run with a reduced set of privileges, enhancing the security and isolation of the container environment. For example, Docker uses a default set of capabilities that are granted to the processes running inside a container, and allows users to add or drop capabilities as needed12.
References:
* Capabilities | Docker Documentation1
* Linux Capabilities: Making Them Work in Containers2

53. Frage
In order to use the optiondom0_memto limit the amount of memory assigned to the Xen Domain-0, where must this option be specified?

A. In any of Xen's global configuration files.
B. In its .config file, when the Domain-0 kernel is built.
C. In the bootloader configuration, when Xen is booted.
D. In the configuration file /etc/xen/Domain-0.cfg, when Xen starts.
E. In its Makefile, when Xen is built.

Antwort: C

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

Antwort:

Begründung:
unshare

55. Frage
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)?

A. Hard Disks
B. Host Bus Adapters
C. Network Interfaces
D. IO Cache
E. Memory

Antwort: E

56. Frage
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