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We have an infrastructure with service discovery and load balancing (i.e. server side with STM and weblogic cluster). Now we are in the process of refactoring into micro-services. We would need an API gateway which does basic routing to other microservices. Netflix Zuul looks a good candidate however I could not get Zuul working without Eureka - but we do not need Eureka since we already have service discovery and load balancing in place.
Thanks.
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Each request received by Zuul is forwarded to a different instance in a round robin fashion. If we start another instance and register it in Eureka, Zuul will register it automatically and start forwarding requests to it: Hello from 'SPRING-CLOUD-EUREKA-CLIENT with Port Number 8083'!
Regarding Zuul, there is a RibbonRoutingFilter that routes your request to an actual service instance. RibbonRoutingFilter is using Ribbon to choose a server from the list that is given from your configuration or from Eureka. So if you want to use Zuul as a load-balanced reverse proxy, Zuul needs Ribbon.
Zuul acts as the API gateway, providing a uniform, single point of entry into the set of microservices, while Eureka is essentially used as a “meta data” transport. Each client application instance (read microservice) registers its instance information (location, port, etc.)
Eureka Server is an application that holds the information about all client-service applications. Every Micro service will register into the Eureka server and Eureka server knows all the client applications running on each port and IP address. Eureka Server is also known as Discovery Server.
Yes, it is totally possible.You have to use @EnableZuulProxy on your config class and config it something like this :
zuul:
routes:
yourService:
path: /yourService/**
serviceId: yourService
ribbon:
eureka:
enabled: false
yourService:
ribbon:
listOfServers: localhost:8080
A sample usage can be like this:
shared.microservice.customer.service1.url=zttp://127.0.0.1:8080/shared/microservice/customer/
shared.microservice.customer.service2.url=zttp://127.0.0.1:8181/shared/microservice/customer/
ribbon.eureka.enabled = false
zuul.routes.customer-micro-service.path: /shared/microservice/customer/**
zuul.routes.customer-micro-service.serviceId: customers
customers.ribbon.listOfServers =
zttp://ip:port1/shared/microservice/customer/,zttp://ip2:port2/shared/microservice/customer/
Yes, Of course you can. Actually, by default, if you use @EnableZuulProxy with the Spring Boot Actuator, you enable two additional endpoints:
application.yaml
zuul:
routes:
users:
path: /myusers/**
url: https://example.com/users_service
These simple url-routes do not get executed as a HystrixCommand, nor do they load-balance multiple URLs with Ribbon.
Yo can get more information from here.
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