DCA Question #41: Real Exam Question with Answer & Explanation

Question

What service mode is used to deploy a single task of a service to each node?

Options

• Areplicated
• Bspread
• Cuniversal
• Ddistributed
• Eglobal

Explanation

The global service mode in Docker Swarm ensures that exactly one task of a service runs on every available node in the swarm.

Common mistakes.

• A. Replicated services run a specified number of identical tasks across the swarm, not necessarily one per node.
• B. Spread is a deployment strategy, not a service mode; it aims to evenly distribute tasks across nodes but doesn't guarantee one per node.
• C. "Universal" is not a standard Docker Swarm service mode.
• D. "Distributed" is a general term and not a specific Docker Swarm service mode for deploying one task per node.

Concept tested. Docker Swarm global service mode

Reference. https://docs.docker.com/engine/swarm/services/

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