Will this command list all nodes in a swarm cluster from the command line?Solution: 'docker swarm nodes'
Answer(s): B
= The correct command to list all nodes in a swarm cluster from the command line is docker node ls, not docker swarm nodes. The docker node command allows you to manage nodes in a swarm, such as listing, inspecting, updating, or removing nodes. The docker swarm command allows you to manage the swarm itself, such as initializing, joining, leaving, or updating the swarm.
Manage nodes in a swarm | Docker DocsManage a swarm | Docker Docs
Will this command list all nodes in a swarm cluster from the command line?Solution: 'docker node Is'
Answer(s): A
= (Please check the official Docker site for the comprehensive explanation)
(Some possible references from the web search results are)[Docker Swarm Tutorial: Manage Multiple Docker Hosts - Edureka][Docker Swarm - Docker Documentation][Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - Linux Hint][Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - YouTube][Docker Swarm Tutorial: How to Manage Multiple Docker Hosts - Medium]I hope this helps you in your exam preparation. Good luck!
Will this command list all nodes in a swarm cluster from the command line?Solution: `docker Is -a'
The command docker Is -a does not list all nodes in a swarm cluster from the command line, but rather lists all containers, both running and stopped, on the current node. To list all nodes in a swarm cluster, you need to use the command docker node ls from a manager node. This command shows the node ID, hostname, status, availability, and manager status for each node in the swarm. You can also use the --filter option to filter the output based on various criteria.
Docker Documentation, docker node ls
Is this a type of Linux kernel namespace that provides container isolation?Solution: Storage
= Storage is not a type of Linux kernel namespace that provides container isolation. Linux namespaces are a feature of the Linux kernel that partitions kernel resources such that one set of processes sees one set of resources while another set of processes sees a different set of resources. The feature works by having the same namespace for a set of resources and processes, but those namespaces refer to distinct resources. Since kernel version 5.6, there are 8 kinds of namespaces:mount, UTS, IPC, PID, network, user, cgroup, and time. Each kind of namespace isolates a different aspect of the system, such as file system mounts, host and domain names, inter-process communication, process IDs, network interfaces, user and group IDs, cgroups, and system time.Storage is not one of them.
1: Linux namespaces - Wikipedia2: Namespaces -- The Linux Kernel documentation
Is this a type of Linux kernel namespace that provides container isolation?Solution: Network
Network is a type of Linux kernel namespace that provides container isolation. Network namespaces isolate the system resources associated with networking, such as network interfaces, IP addresses, routing tables, firewall rules, etc. Each network namespace has its own virtual network stack, and processes in different network namespaces can communicate through virtual network devices or tunnels. Network namespaces are used by Docker to create isolated networks for containers, and allow users to customize the network configuration and connectivity of each container.
network_namespaces(7) - Linux manual pageDocker network overview | Docker Documentation
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