Docker simplifies the creation and shutdown of a microservice by introducing a `deploy` attribute in Docker Compose version 3, which allows for specifying replicas, rolling updates, and restart policies for containers. A microservice is defined using two services: `db` and `web`, with the `db` service starting a Couchbase server and the `web` service starting a WildFly application server. The `docker-compose.yml` file defines the services and their dependencies, including port forwarding and environment variables. To deploy the microservice, the command `docker stack deploy --compose-file=docker-compose.yml webapp` is used. Once deployed, the microservice can be accessed by sending HTTP requests to its exposed ports. The service can also be managed using Docker commands such as `docker service ls` and `docker service logs`. Additionally, the microservice can be created, updated, or deleted using RESTful API endpoints.