Which command is utilized to deploy a Docker Swarm service?

The command used to deploy a Docker Swarm service is "docker service create." This command is specifically designed for creating and launching services within a Docker Swarm cluster. When you deploy a service, you define the service's desired state, including the number of replicas, the container image to use, and any configurations or constraints needed for the service to run correctly.

Using "docker service create" enables you to manage the lifecycle of services more effectively in a Swarm environment, allowing for scaling, updates, and rollbacks while maintaining fault tolerance and load balancing across the nodes in the swarm.

The other commands serve different purposes. "docker start" is used primarily for starting stopped containers, not for creating services in a swarm. "docker swarm init" initializes a new swarm but does not deploy services. "docker run" is used to create and start containers from images, but it does so outside the context of a swarm service, making it appropriate for standalone containers rather than clustered services.