Service Discovery - Eureka Server and Client

 

Steps to Build Service Discovery

EUREKA SERVER

Step 1

Create a Spring boot project and add dependency

Step 2

Add the spring-cloud-starter-netflix-eureka-server dependency to your pom.xml file

1.       Web

2.       Actuator

3.       Eureka dependency

Step 3

In your main application, annotate it with @EnableEurekaServer.this will enable Eureka Server Functionality

Step 4

Configure Below properties in application.

1.       Application name

2.       Port number

3.       Enable Actuator

4.       Erueka Configuartion

·         Register with Eureka

·         Fetch Register

·         Default Zone URL

Build and run the Eureka Server: Open a browser and navigate to http://localhost:9002. You should see the Eureka Server Dashboard, which displays information about registered Service instances.

 

Detailed Steps

Step 1

File->new ->spring starter project



Step 2

Add the spring-cloud-starter-netflix-eureka-server dependency to your pom.xml file



 

Step 3

In your main application, annotate it with @EnableEurekaServer This will enable Eureka Server Functionality.

 



Step 4



spring.application.name=eureka-server: This property sets the name of the Spring Boot application. In this case, it's named "eureka-server". This name is significant when registering with a service registry like Eureka, as it identifies the application uniquely within the registry.

server.port=9002: This property specifies the port on which the Spring Boot application will run. In this case, it's configured to run on port 9002.

management.endpoints.web.exposure.include=*: This property configures which actuator endpoints are exposed over HTTP. Setting it to * means that all actuator endpoints will be exposed. Actuator endpoints provide various information about the application, like health, metrics, etc.

eureka.client.fetch-registry=false: This property configures whether the application should fetch registry information from the Eureka server. Setting it to false means that the application will not fetch registry information from Eureka.

eureka.client.register-with-eureka=false: This property configures whether the application should register itself with the Eureka server. Setting it to false means that the application will not register itself with Eureka.

eureka.client.service-url.defaultZone=http://localhost:9002/eureka/: This property specifies the URL of the Eureka server where the application will register or fetch registry information. In this case, it's configured to use http://localhost:9002/eureka/.

eruka.instance.ip-address=true: This property configures whether the IP address of the instance should be included in the Eureka registration information. Setting it to true means that the IP address will be included.

As Yaml



Eureka Server: http://localhost:9002/



 

Points to Remember

·       If you set fetch-registry: true and register with eureka: true . The server itself act as a application



·         If you did not set the default zone in YAML then Eureka default address is http://localhost:8761/eureka/

Eureka Client

Step 1

User Existing microservices and add necessary dependency in pom.xml

Step 2

Add the Spring-cloud-starter-netflix-eureka-client dependency to your pom.xml file

Step 3

Enable the Eureka client in your main application class by adding the @EnableDiscoveryClient annotation

Step 4

Configure the Below properties in the application

·         Application name

·         Port number

·         Enable Actuator

·         Erueka Configuartion

·         Register with Eureka

·         Fetch Registery

·         Default Zone URL

·         Prefer-IP address (only for cloud deployment)

 

Detailed Steps

Step 1

User Existing microservices and add necessary dependency in pom.xml

 

 



Step 2

Add the Spring-cloud-starter-netflix-eureka-client dependency to your pom.xml file

Pom.xml



Step 3

Enable the Eureka client in your main application class by adding the @EnableDiscoveryClient annotation



Step 4

Configure the Below properties in the application

·         Application name

·         Port number

·         Enable Actuator

·         Erueka Configuartion

·         Register with Eureka

·         Fetch Registery

·         Default Zone URL

·         Prefer-ip address (only for cloud deployment)

 

 



 

Eureka Server: http://localhost:9002/



 

How to run the project in multiple instances

Right Click on project -> Run As -> Run Configuration



 

Right-click on the project that needs to run on multiple instances à Select the duplicate


 

Change the port number->click Run


Now two instances of account service are running in different port


Now two instances are displaying in the Eureka Server


Location: Chennai, Tamil Nadu, India

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