DCA Question #37: Real Exam Question with Answer & Explanation

Question

You have just executed 'docker swarm leave' on a node. What command can be run on the same node to confirm it has left the cluster?

Options

• Adocker node ls
• Bdocker system info
• Cdocker system status
• Ddocker system status

Explanation

To confirm that a node has successfully left a Docker Swarm cluster, the docker system info command can be used.

Common mistakes.

• A. The docker node ls command is used by a manager node to list nodes currently in an active swarm; a node that has left the swarm cannot execute this command to check its own swarm status.
• C. docker system status is not a valid Docker CLI command.
• D. docker system status is not a valid Docker CLI command (repeated from C).

Concept tested. Verifying Docker Swarm node status

Reference. https://docs.docker.com/engine/reference/commandline/system_info/

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