Deploy spring boot microservices to heroku - spring-boot

Question

I am trying to deploy my microservices to heroku but without success. At first I created application for service registry (eureka) with following configuration:
spring:
application:
name: eureka
server:
port: 8761
eureka:
instance:
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
Next I deploy application, url of deployed app is like https://eureka.herokuapp.com. I configure with this url my other apps like gateway and business services.
Example of my gateway configuration
spring:
application:
name: gateway
server:
port: 8081
eureka:
client:
healthcheck:
enabled: true
serviceUrl:
defaultZone: https://eureka.herokuapp.com/eureka/
same configuration I used for my user service, just different app name (user-service). When I go to https://gateway.herokuapp.com/user-service/user I cannot receive any response. In heroku logs of gateway app I can see exception because of timeout of user service which I don't understand because when I call https://user.herokuapp.com/user directly I get response
I also find out in my eureka dashboard is not registered replicas, I am not sure if it ok. Can you tell me what I did wrong? Thank you.
error log from gateway app:
2019-12-01T19:53:29.503419+00:00 heroku[router]: at=info method=GET
path="/user-service/user" host=gateway.herokuapp.com
request_id=7818f5eb-34af-47f9-94db-7dc4f9609c31 fwd="86.49.253.78"
dyno=web.1 connect=0ms service=8110ms status=500 bytes=465
protocol=https

Answer 1

Your gateway configuration missing gateway discovery section. Also registry does not require "serviceUrl"
Try bellow configuration
registry
spring:
application:
name: eureka
server:
port: 8761
eureka:
instance:
prefer-ip-address: false
client:
register-with-eureka: false
fetch-registry: false
Gateway
spring:
application:
name: gateway
cloud:
discovery:
enabled: true
gateway:
discovery:
locator:
enabled: true
lower-case-service-id: true
server:
port: 8081
eureka:
client:
fetch-registry: true
register-with-eureka: true
healthcheck:
enabled: true
serviceUrl:
defaultZone: https://eureka.herokuapp.com/eureka/