CODEWITHSUNDEEP
javaspringspring-cloudnetflix-eureka
jlian
jlian

Reputation: 11

How to regist an Eureka client to a Eureka server cluster with loadbalance?

When I deploy microservice eureka client and set eureka server's url like below:

eureka.client.serviceUrl.defaultZone=http://10.118.28.94:7701/eureka/,http://10.154.32.88:7701/eureka/

I found the client always register into the first Eureka server(10.118.28.94:7701), and I want to know how to make loadbalance to prevent all the clients register into a same eureka server? Should I adjust the order of the server list manually?

Upvotes: 1

Views: 1736

Answers (1)

jbaddam17
jbaddam17

Reputation: 327

this may confuse you, please follow one step at a time

and follow this link to understand micro services registration with eureka server

or start here

to make eureka clustering, you need to run two instances of eureka server

configure eureka server application.proerties as follow

#EMBEDDED SERVER CONFIGURATION (ServerProperties)
server.port=8081

#Configuration for service registration with Eureka Server
eureka.instance.hostname=peer1
eureka.server.hostname=peer2
eureka.server.port=8082
eureka.client.serviceUrl.defaultZone=http://${eureka.server.hostname}:${eureka.server.port}/eureka/
eureka.server.renewalPercentThreshold=0.49

#self registration Configuration
eureka.client.registerWithEureka: false
eureka.client.fetchRegistry: false

run application outside IDE after packaged eureka server as jar

Note update your hosts information before running applications in windows C:\Windows\System32\drivers\etc open hosts file paste these 

    127.0.0.1  peer1 
    127.0.0.1  peer2

now you are ready to run eureka

instance 1 : java -jar eurekaserveryourartifact.jar

to run the second instance, you need to override certain properties in application.proerties by passing them as VM arguments when running application, as below

instance 2 : java -jar -Dserver.port=8082 -Deureka.instance.hostname=peer2 -Deureka.server.hostname=peer1 eureka.server.port=8081 eurekaserveryourartifact.jar

---------------------- Eureka clustering completed till here ------------

access eureka1 : peer1:8081 or localhost:8081

access eureka2 : peer2:8082 or localhost:8082

make sure 1st eureka shows replica as peer2 and 2nd server shows replica as peer1

Now Register your services with eureka

register your services(eureka client) with 1st eureka server, automatically those will register with 2nd eureka server also. and clients should have following configuration in application.proerties as follow. 

    #reading values from pom.xml
    spring.application.name=@artifactId@
    #service registration with Eureka Server
    eureka.server.port=8081
    eureka.server.hostname=peer1       
  eureka.client.serviceUrl.defaultZone=http://${eureka.server.hostname}:${eureka.server.port}/eureka/    eureka.instance.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}

to test load balancing its better to run multiple instances of service, by overriding server port, as below

service ins1: java -jar serviceartifact.jar

and

service ins2: java -jar -Dserver.port=8082 serviceartifact.jar

Now you can see 2 instances of service registered with eureka1 and eureka2

while accessing these services, if one instance of service goes down another instance (note : both services are running on different ports) url will provided to consumer of service automatically by eureka server.

and we can also do client side loadbalancing using ribbon

Upvotes: 2

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