I am trying to create spring cloud microservices and also need to include eureka server and zuul as spring cloud tools. Now I created one module in my one spring boot project. I registered that service with eureka server. And also I created one spring boot project for adding zuul service discovery and also registered with eureka project.
Here my doubt is that When I am adding another module as another spring boot project, Can I register that application also with my current eureka server as client? What type of relation that eureka server project and microservice having? one-To-One or One-To-Many? Can I register 3 or 4 microservices with one eureka server as client?
Eureka Server will let you add as many microservices (modules of spring boot projects like you said).
From Spring Cloud landing page:
As long as Spring Cloud Netflix and Eureka Core are on the classpath
any Spring Boot application with #EnableEurekaClient will try to
contact a Eureka server on http://localhost:8761 (the default value of
eureka.client.serviceUrl.defaultZone):
That means that you can use a single eureka server for multiple microservices which are registered as clients to the eureka server.
So yes, it's a One-To-Many relationship.
You will want at one point to look into multiple Eureka servers used in load balancing, for redundancy purposes, but for now you will be fine.
Related
I am working on Spring cloud framework. So each of my microservices will have to register with Eureka server, so Eureka knows the unique id or the application name.
(1) I have to have more than one instance of same microservice to be registered with Eureka, How do I achieve that? Microservice is deployed in Cloud Foundry.
(2) When all those instances from same microservices are registered with Eureka, how does Eureka know which instances are active and which not? How often Eureak knows and how Eureka gets this information.
Each instance sends are heartbeat to the eureka server, by default every 30 seconds.
I am trying to setup a Spring Boot Admin server on a Cloud foundry. I am using the client Spring Cloud Discovery with SimpleDiscoveryClient configuration. We are not having any Thrid Party service discovery client like eureka. I can see the service getting registered to the spring boot admin server. But when i scale up any service, i see only one instance of that service and the actual number of instances are not reflected. I would like to know if that is possible without Eureka or any other service discovery, if yes how to achieve that without them.
Thanks
I am developing a microservice, using Spring Boot, that exposes REST Endpoint. Because of scalability, I have to run multiple instances of this services on a different port. What will be the configurations for the applications so that it can register with eureka and requests are load balanced? I am using Spring cloud config, Eureka server and zuul.
Attaching following entries in the client properties file will do the trick. This is for Spring cloud config dalston
eureka.instance.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}
I guess you meant to register with Eureka instead of Config server.
To register multiple instances that might be running in the same host but listening on a different port you would need to set eureka.instance.metadataMap.instanceId to a unique value maybe using:
eureka.instance.metadataMap.instanceId=${spring.application.name}:${random.int}
I have a microservice built using Spring Boot and Netflix OSS. I have used Central config server, Eureka and Zuul. Because of scalability multiple instances of the services is running on different port. All the instances are registered in Eureka but requests are going to only last registered server.
How to load balance services. Should I use ribbon in Zuul to load balance? Please let me know how to achieve load balancing on same service running on multiple instances.
If there is a code change required a snippet then please post a code snippet as well.
Application Config
spring.application.name=book-service
server.port=0
eureka.client.region = default
eureka.client.registryFetchIntervalSeconds = 5
eureka.client.serviceUrl.defaultZone=http://discUser:discPassword#localhost:10082/eureka/
#eureka.instance.metadataMap.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}
eureka.instance.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}
eureka.instance.leaseRenewalIntervalInSeconds=5
eureka.instance.leaseExpirationDurationInSeconds=5
Eureka Config
spring.application.name=discovery
server.port=10082
eureka.instance.hostname=localhost
eureka.client.serviceUrl.defaultZone=http://discUser:discPassword#localhost:10082/eureka/
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
spring.session.store-type=hash-map
ZUUL Config
spring.application.name=gateway
server.port=10080
eureka.client.region = default
eureka.client.registryFetchIntervalSeconds = 5
management.security.sessions=always
zuul.routes.book-service.path=/book-service/**
zuul.routes.book-service.sensitive-headers=Set-Cookie,Authorization
hystrix.command.book-service.execution.isolation.thread.timeoutInMilliseconds=600000
#zuul.routes.rating-service.path=/rating-service/**
#zuul.routes.rating-service.sensitive-headers=Set-Cookie,Authorization
#hystrix.command.rating-service.execution.isolation.thread.timeoutInMilliseconds=600000
zuul.routes.discovery.path=/discovery/**
zuul.routes.discovery.sensitive-headers=Set-Cookie,Authorization
zuul.routes.discovery.url=http://localhost:8082
hystrix.command.discovery.execution.isolation.thread.timeoutInMilliseconds=600000
logging.level.org.springframework.web.=debug
logging.level.org.springframework.security=debug
logging.level.org.springframework.cloud.netflix.zuul=debug
spring.session.store-type=hash-map
Registering application properly with Eureka will do the trick.
Below entries will uniquely register services with Eureka.
#eureka.instance.metadataMap.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}
eureka.instance.instanceId=${spring.application.name}:${spring.application.instance_id:${random.value}}
I'm having a problem with how to use just Netflix Archaius to work as a config server for multiple Spring Boot microservices. Previously when I applied Eureka and Spring Cloud Config Server in my multiple-services project built with Spring Boot, each microservie would get its own .properties file from the Spring Cloud Config server through the discovery function of the Eureka service. But now I need to change the Spring Cloud Config Server into a Netflix Archaius service, from which the Spring Boot microservices will get .properties file, i have no idea about how to achieve it. Is there any good idea for my reference? Thanks in advance.
Finally I gave up using Netflix Archaius to pull properties file for microservices. Instead, I wrote down required key-value-pair properties into the application.properties of each springboot microservice. Since all the springboot microservices will be deployed in the DCOS platform in the form of docker containers, some inconstant properties were configured into the marathon deployment scripts, which could be populated into the springboot applet. In this way I managed to configure the key-value-pair properties from the outside instead of being hardcoded in the program codes.