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| Section | Objectives |
|---|---|
| Topic 1: Container Orchestration | - Scaling and deployment
|
| Topic 2: Virtualization Concepts and Implementation | - Virtual machine management
|
| Topic 3: Storage, Networking, and Security | - Storage for virtual environments
|
| Topic 4: Container Virtualization | - Container lifecycle management
|
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NEW QUESTION # 118
Which functionality is provided by Vagrant as well as by Docker? (Choose three.)
Answer: C,D,E
Explanation:
* Both Vagrant and Docker can share directories from the host file system to a guest. This allows the guest to access files and folders from the host without copying them. Vagrant uses the config.vm.
synced_folder option in the Vagrantfile to specify the shared folders1. Docker uses the -v or -- volume flag in the docker run command to mount a host directory as a data volume in the container2.
* Both Vagrant and Docker can download required base images. Base images are the starting point for creating a guest environment. Vagrant uses the config.vm.box option in the Vagrantfile to specify the base image to use1. Docker uses the FROM instruction in the Dockerfile to specify the base image to use2. Both Vagrant and Docker can download base images from public repositories or local sources.
* Both Vagrant and Docker can apply changes to a base image. Changes are modifications or additions to the base image that customize the guest environment. Vagrant uses provisioners to run scripts or commands on the guest after it is booted1. Docker uses instructions in the Dockerfile to execute commands on the base image and create a new image2. Both Vagrant and Docker can save the changes to a new image or discard them after the guest is destroyed.
* Vagrant and Docker differ in how they start system images. Vagrant starts system images as virtual machines by default, using a provider such as VirtualBox, VMware, or Hyper-V1. Docker starts system images as containers by default, using the native containerization functionality on macOS, Linux, and Windows2. Containers are generally more lightweight and faster than virtual machines, but less secure and flexible. References: 1: Vagrant vs. Docker | Vagrant | HashiCorp Developer 2: Vagrant vs Docker: Which Is Right for You? (Could Be Both) - Kinsta Web Development Tools
NEW QUESTION # 119
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 # 120
What is the purpose ofcloud-init?
Answer: C
NEW QUESTION # 121
Which of the following KVM parameters is identical to the KVM parameter -hdb file.img?
Answer: E
Explanation:
In QEMU/KVM, the legacy parameter -hdb file.img attaches a disk image as theprimary IDE slave device.
According to QEMU documentation, this corresponds to an IDE device withindex 1, media typedisk, and interfaceIDE.
The modern equivalent using the -drive syntax is:
-drive file=file.img,index=1,media=disk,if=ide
OptionDmatches this mapping precisely. The other options use invalid or unsupported parameter combinations and do not correctly represent the IDE device mapping.
Therefore, the correct answer isD.
NEW QUESTION # 122
Which of the following mechanisms are used by LXC and Docker to create containers? (Choose three.)
Answer: A,C,D
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 # 123
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