Auto-configure routes with Zuul and Eureka - spring-boot

Question

Through reading various books / tutorials, it appears that it is possible to auto-configure routes in Zuul when using it in combination with Eureka service discovery. That means that I don't have to explicitly add routes to Zuul's application.properties.
So I understand this correctly? Or do I still need to add routes explicitly to Zuul in order it to work as a gateway?
I would like it to automatically create routes from the application name's that are registered with Eureka. Is this possible?
(Note: I have actually tried this, but when I go to http://localhost:8762/routes I just get an error page.)

Answer 1

Sure. In most microservices implementations, internal microservices endpoints are not exposed outside. A set of public services will be exposed to the clients using an API gateway.
The zuul proxy internally uses the Eureka Server for service discovery.
I would like it to automatically create routes from the application name's that are registered with Eureka. Is this possible?
Sure. I will show you gateway example.
1. Create your service project (user-service)
create application.properties file
# --- Spring Config
spring:
application:
name: OVND-USER-SERVICE
# Eureka client
eureka:
client:
serviceUrl:
defaultZone: ${EUREKA_URL:http://localhost:8761/eureka/}
2. Setting up Zuul project (Gateway-service)
1.#EnableZuulproxy to tell Spring Boot that this is a Zuul proxy
#SpringBootApplication
#EnableZuulProxy
#EnableDiscoveryClient
public class GatewayServiceApplication {
2.create an application.properties file
# =======================================
# Gateway-service Server Configuration
# =======================================
# --- Spring Config
spring:
application:
name: gateway-service
server:
port: ${PORT:8080}
# Eureka client
eureka:
client:
serviceUrl:
defaultZone: ${EUREKA_URL:http://localhost:8761/eureka/}
zuul:
host:
routes:
## By default, all requests to user service for example will start with: "/user/"
## What will be sent to the user service is what comes after the path defined,
## So, if request is "/user/v1/user/tedkim", user service will get "/v1/user/tedkim".
user-service:
path: /user/**
service-id: OVND-USER-SERVICE
another-service:
path: /another/**
service-id: OVND-ANOTHER-SERVICE
Eureka website ( localhost:8761 )

Answer 2

Yes. You can integrate Zuul with Eureka and configure the routes based on application names registered in Eureka. Just add the following configuration to Zuul application:
zuul:
ignoredServices: "*"
routes:
a-service: /a-service/**
b-service: /b-service/**
c-service: /c-service/**
d-service: /d-service/**