Deploying Services to Swarm

In Docker Swarm, a service is the definition of how you want to run a containerized application across your cluster.

Instead of running individual containers, you define a service to tell Swarm: "I want to run X instances of this image, on these ports, with these settings."

Swarm then ensures your desired state is maintained, automatically restarting containers if they fail.

Think of it this way:

• A container is a single instance of an application.
• A service is a blueprint for running one or more identical containers (called tasks) across your Swarm.

Services provide high availability and scalability by distributing tasks and handling failures automatically.