Numbers

Numbers is a sample application that demonstrates the use of Spring Cloud.

Eureka Server

Eureka is used as a service registry. Each of the applications in this example will register with the Eureka server.

Build and run the Eureka Server:

cd eureka-server
mvn spring-boot:run

The Eureka server is running at http://locahost:8761

Config Server

The config server demonstrates the use of external configuration. In this case the default number for the numbers-service is configured in a github repository.

In a new terminal window, build and run the Config Server:

cd config-server
mvn spring-boot:run

The config server is running at http://localhost:8888

Hystrix Dashboard

The Hystrix dashboard displays the status and health of the requests to the numbers service. The numbers service and app must be running before the hystrix stream is available for display.

In a new terminal window, build and run the Hystrix Dashboard:

cd hystrix-dashboard
mvn spring-boot:run

Open the Hystrix dashboard at http://localhost:7979/hystrix

Numbers Service

The numbers service provides a single REST endpoint at http://numbers-service/number, which returns an incremented number each time it receives a GET request.

In a new terminal window, build and run the Numbers Service:

cd numbers-service
mvn spring-boot:run

The numbers service is configured to start on a random port so that you may run multiple instances of the service.

Numbers App

The numbers app is the main "UI" for the application. Eureka tells the numbers app where to find the numbers service. The numbers app then makes a request to the numbers service for the next number.

cd numbers-app
mvn spring-boot:run

Make multiple requests to the app to retrieve an incremented number: