Springcloud Learning--eureka Service Registration and discovery

Directory

　　One: Build the project

　　Second: Service Registration and discovery

Why choose Eureka, please see a blog Eureka--talking about Eureka

Project Building

Idea Select New Project to select Spring initializr

Fill in group, artifice project name, tick type Gradle Config (this is based on Gradle implementation)

Select components: According to their own needs to choose, here need Eureka to do as a registration center, so I first ticked the line of the Eureka two service dependencies

Use subprojects in Bulid.gradle to unify the configuration of all child items after creation is complete

subprojects{} role: When using multi-module projects, different modules have the same configuration, resulting in duplicate configuration, you can extract the same parts, using configuration injection technology to complete the configuration of the sub-project. The root project is like a container, and the subprojects method iterates through all the elements of the container and injects the specified configuration.

Service Registration and Discovery Registration Center

First, create a modules module, which operates as follows: Right-click Project New Module

Choose Gradle (If you build with Maven, choose Maven)

Input module Name Register-center

Complete the module creation and add the Eureka Registration service dependency in the Bulid.gradle of the Submodule

Dependencies {    compile (' org.springframework.cloud:spring-cloud-starter-netflix-eureka-server ') }

Create a startup class in main registerapplication (note adding @enableeurekaserver annotations to indicate that you are a registry)

@SpringBootApplication @enableeurekaserver // indicate that you are a registered center  Public class registerapplication {    publicstaticvoid  main (string[] args) {        Springapplication.run (registerapplication. class , args);}    }

Add a APPLICATION.YML profile to resources

Spring:  application:    name:register-centerserver:  Port:10000eureka:  client:    service-url:     defaultzone:http://localhost:10000/eureka# Default address    register-with-eureka:false# not registered at startup indicates that you are a registry    Fetch-registry:false

View Code

The Eureka Port address is customized here

Its Eureka default port address is 8761

　　　　Open Eureka Address Find yourself (register-center) has been registered into, and we initially just let it as a registry is mismatched

Can be found now is not configured Register-with-eureka:false Fetch-registry:false these two lines of code Eureka also register themselves in, add the two lines of code into the configuration file again refresh Eureka found that they are no longer the note Book Center.

Service discovery

Ibid. create a module (order-client) to add a dependency of Eureka client in its Bulid.gradle

Dependencies {    compile (' org.springframework.cloud:spring-cloud-starter-netflix-eureka-client ') }

Create a Startup class Orderclientapplication (add @enablediscoveryclient//to represent yourself as a Eureka client)

// indicate that you are a Eureka client  Public class orderclientapplication {    publicstaticvoid  main (string[] args) {        Springapplication.run (orderclientapplication. class , args);}    }

Add APPLICATION.YML configuration There is no need to write Register-with-eureka:false Fetch-registry:false

It should be noted here that starting the Eureka Server (Register-center) starts, and then starting the client (order-client), if the server is not started first (you can also add Register-with-eureka:false Fetch-registry:false resolution But this becomes the service side, not what we want, the client will report the following error

Here is involved in the characteristics of Eureka: that is, the service side, but also the client, follow-up will be on the Eureka registration process for an analysis to learn, please pay attention to Bo Master O, here first do not explain

Start the server and start the client, refresh the registry, and discover that the client is already registered.

At this point, Eureka's service registration has been implemented.

Springcloud Learning--eureka Service Registration and discovery