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| Section | Objectives |
|---|---|
| Topic 1: Container Orchestration | - Scaling and deployment
|
| Topic 2: Storage, Networking, and Security | - Networking
|
| Topic 3: Virtualization Concepts and Implementation | - Hypervisors and architectures
|
| Topic 4: Container Virtualization | - Container lifecycle management
|
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NEW QUESTION # 76
If aDockerfilecontains the following lines:
WORKDIR /
RUN cd /tmp
RUN echo test > test
where is the filetestlocated?
Answer: C
Explanation:
Explanation
The WORKDIR instruction sets the working directory for any subsequent RUN, CMD, ENTRYPOINT, COPY and ADD instructions that follow it in the Dockerfile1. The RUN instruction executes commands in a new layer on top of the current image and commits the results2. The RUN cd command does not change the working directory for the next RUN instruction, because each RUN command runs in a new shell and a new environment3. Therefore, the file test is created in the root directory (/) of the container image, not in the /tmp directory. References:
* Dockerfile reference: WORKDIR
* Dockerfile reference: RUN
* difference between RUN cd and WORKDIR in Dockerfile
NEW QUESTION # 77
Which of the following statements about the commandlxc-checkpointis correct?
Answer: B
Explanation:
Explanation
The command lxc-checkpoint is used to checkpoint and restore containers. Checkpointing a container means saving the state of the container, including its memory, processes, file descriptors, and network connections, to a file or a directory. Restoring a container means resuming the container from the saved state, as if it was never stopped. Checkpointing and restoring containers can be useful for various purposes, such as live migration, backup, debugging, or snapshotting. The command lxc-checkpoint has the following syntax:
lxc-checkpoint {-n name} {-D path} [-r] [-s] [-v] [-d] [-F]
The options are:
* -n name: Specify the name of the container to checkpoint or restore.
* -D path: Specify the path to the file or directory where the checkpoint data is dumped or restored.
* -r, --restore: Restore the checkpoint for the container, instead of dumping it. This option is incompatible with -s.
* -s, --stop: Optionally stop the container after dumping. This option is incompatible with -r.
* -v, --verbose: Enable verbose criu logging. Only available when providing -r.
* -d, --daemon: Restore the container in the background (this is the default). Only available when providing -r.
* -F, --foreground: Restore the container in the foreground. Only available when providing -r.
The command lxc-checkpoint uses the CRIU (Checkpoint/Restore In Userspace) tool to perform the checkpoint and restore operations. CRIU is a software that can freeze a running application (or part of it) and checkpoint it to a hard drive as a collection of files. It can then use the files to restore and run the application from the point it was frozen at1.
The other statements about the command lxc-checkpoint are not correct. It does not create a clone or an image of a container, nor does it double the memory consumptionof the container. It can work on both running and stopped containers, depending on the options provided. References:
* Linux Containers - LXC - Manpages - lxc-checkpoint.12
* lxc-checkpoint(1) - Linux manual page - man7.org3
* CRIU4
NEW QUESTION # 78
Which of the following statements are true about container-based virtualization? (Choose two.)
Answer: A,D
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 # 79
What is Docker Hub?
Answer: C
Explanation:
Docker Hub is acloud-based container image registryused to store, manage, and distribute Docker container images. According to container documentation, it hosts bothofficial imagesand user-contributed images.
Docker Hub is not a Linux distribution, orchestration platform, or runtime. Therefore, the correct answer isB.
NEW QUESTION # 80
Which of the following commands moves the libvirt domainweb1from the current host system to the host systemhost2?
Answer: E
NEW QUESTION # 81
......
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