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| Section | Weight | Objectives |
|---|---|---|
| Full Virtualization | 25% | - Virtualization Concepts and Theory - Xen - Virtual Machine Disk Image Management - Libvirt Virtual Machine Management - QEMU |
| VM Deployment and Provisioning | 12% | - Vagrant - Packer - cloud-init - Cloud Management Tools |
| Container Virtualization | 25% | - Container Virtualization Concepts - Docker - LXC - Container Orchestration Platforms |
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NEW QUESTION # 49
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?
Answer: B
Explanation:
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
NEW QUESTION # 50
Which of the following values would be valid in the FROM statement in aDockerfile?
Answer: E
Explanation:
Explanation
The FROM statement in a Dockerfile specifies the base image from which the subsequent instructions are executed1. The value of the FROM statement can be either an image name, an image name with a tag, or an image ID1. The image name can be either a repository name or a repository name with a registry prefix2. For example, ubuntu is a repository name, and docker.io/ubuntu is a repository name with a registry prefix2. The tag is an optional identifier that can be used to specify a particular version or variant of an image1. For example, ubuntu:focal refers to the image with the focal tag in the ubuntu repository2. The image ID is a unique identifier that is automatically generated when an image is built or pulled1. For example, sha256:9b0dafaadb1cd1d14e4db51bd0f4c0d56b6b551b2982b2b7c637ca143ad605d2 is an image ID3.
Therefore, the only valid value in the FROM statement among the given options is ubuntu:focal, which is an image name with a tag. The other options are invalid because:
* docker://ubuntu:focal is not a valid image name format. The docker:// prefix is used to specify a transport protocol, not a registry prefix4.
* registry:ubuntu:focal is not a valid image name format. The registry prefix should be a valid hostname or IP address, not a generic term2.
* file:/tmp/ubuntu/Dockerfile is not a valid image name format. The file: prefix is used to specify a local file path, not an image name5.
* http://docker.example.com/images/ubuntu-focal.iso
is not a valid image name format.
The
http:// prefix is used to specify a web URL, not an image name
5.
References:
* 1: Dockerfile reference | Docker Docs
* 2: docker - Using FROM statement in dockerfile - Stack Overflow
* 3: How to get the image id from a docker image - Stack Overflow
* 4: skopeo - Docker Registry v2 API tool - Linux Man Pages (1)
* 5: How to build a Docker image from a local Dockerfile? - Stack Overflow
NEW QUESTION # 51
Which of the following statements are true about container-based virtualization? (Choose two.)
Answer: D,E
Explanation:
Explanation
Container-based virtualization is a method of operating system-level virtualization that allows multiple isolated user spaces (containers) to run on the same host system1. Each container shares the same operating system kernel as the host, but has its own file system, libraries, and processes2. Therefore, the statements A and C are false, as containers do not run their own kernels or rely on hardware support from the CPU. The statement E is also false, as Linux does support container-based virtualization through various technologies, such as cgroups, namespaces, LXC, Docker, etc12. The statement B is true, as different containers may use different distributions of the same operating system, such as Debian, Ubuntu, Fedora, etc., as long as they are compatible with the host kernel3. The statement D is also true, as all containers run within the operating system kernel of the host system, which provides isolation and resource management for them12. References:
* 1: Containerization (computing) - Wikipedia.
* 2: What are containers? | Google Cloud.
* 3: What is Container-Based Virtualization? - StackHowTo.
NEW QUESTION # 52
Which command within virsh lists the virtual machines that are available on the current host?
Answer: C
Explanation:
The virsh command used to listall virtual machines, including both running and stopped domains, isvirsh list --all. The optionlist-alldirectly corresponds to this functionality.
The plain list command only shows running domains. The other options are not valid virsh commands.
Therefore, the correct answer isA.
NEW QUESTION # 53
Which of the following values are valid in thefirmwareattribute of a<os>element in a libvirt domain definition? (Choose two.)
Answer: B,D
NEW QUESTION # 54
......
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