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| Section | Objectives |
|---|---|
| Topic 1: Virtualization Concepts and Implementation | - Virtual machine management
|
| Topic 2: Storage, Networking, and Security | - Security
|
| Topic 3: Container Orchestration | - Kubernetes fundamentals
|
| Topic 4: Container Virtualization | - Container lifecycle management
|
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NEW QUESTION # 89
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 # 90
Which of the following tools is used to interact with XenStore?
Answer: C
Explanation:
XenStoreis a shared configuration and state database used by Xen domains. According to Xen documentation, tools such asxenstore-ls, xenstore-read, and xenstore-write are used to interact directly with XenStore.
Although optionDcontains a minor typographical error ("xentore-ls" instead of xenstore-ls), it clearly refers to the correct and documented utility. None of the other options represent standard XenStore interaction tools.
Therefore, despite the typo,Dis the correct answer.
NEW QUESTION # 91
Which directory is used bycloud-initto store status information and configuration information retrieved from external sources?
Answer: E
NEW QUESTION # 92
What happens when the following command is executed twice in succession?
docker run -tid -v data:/data debian bash
Answer: B
Explanation:
The command docker run -tid -v data:/data debian bash creates and runs a new container from the debian image, with an interactive terminal and a detached mode, and mounts a named volume data at /data in the container12. If the volume data does not exist, it is created automatically3. If the command is executed twice in succession, two containers are created and run, each with its own terminal and process ID, but they share the same volume data. This means that both containers can access, modify, and see the contents of the data volume, and any changes made by one container are reflected in the other container. Therefore, the statement C is true and the correct answer. The statements A, B, D, and E are false and incorrect, as they do not describe the behavior of the command or the volume correctly. References:
* 1: docker run | Docker Docs.
* 2: Docker run reference | Docker Docs - Docker Documentation.
* 3: Use volumes | Docker Documentation.
* [4]: How to Use Docker Run Command with Examples - phoenixNAP.
NEW QUESTION # 93
What is the purpose ofcloud-init?
Answer: A
NEW QUESTION # 94
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