SpringBoot MSA (8) - Spring Cloud Gateway 와 Eureka 연동

Api Gateway Service 와 Discovery Service를 연결하고

 

Discovery Service와 First Service, Second Service를 연결하는 과정입니다.

 

따라서 Discovery Service에는 Api Gateway, First Service, Second Service 3개의 URL 맵핑정보를 관리하고 있습니다.

 

API Gateway Service에 디펜더시 추가 ( Eureka Client )

 

pom.xml

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>

1. apigateway-service 프로젝트 < application.yml >

2. first-service 프로젝트 < application.yml >

3. second-service 프로젝트 < application.yml >

위 3개의 프로젝트에 eureka Discovery Service URL로 설정정보 true로 변경 및 설정

eureka:
  client:
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:8761/eureka

 

기동 순서!!

1. Eureka Server ( discovery service )

2. API Gateway Server ( apigateway-service )

3. First Server, Second Server ( front-service, second-service )

 

Eureka Server ( discovery service )에 3개의 서버가 등록되어있는지 확인해보자!

http://localhost:8761/

Instances currently registered with Eureka에 3개의 서버가 등록되어있다.

 

API Gateway의 라우팅 정보를 변경해보자

apigateway-service < application.yml >

spring.cloud.gateway.routes.uri 변경

Eureka에 등록한 First Service, Second Service의 Application 이름을 설정하면된다.

spring:
  application:
    name: apigateway-service
  cloud:
    gateway:
      default-filters:
        - name: GlobalFilter
          args:
            baseMessage: Spring Cloud Gateway Global Filter
            preLogger: true
            postLogger: true
      routes:
        - id: first-service
          uri: lb://MY-FIRST-SERVICE
          predicates:
            - Path=/first-service/**
          filters:
#            - AddRequestHeader=first-request, first-request-header2
#            - AddResponseHeader=first-response, first-response-header2
            - CustomFilter
        - id: second-service
          uri: lb://MY-SECOND-SERVICE
          predicates:
            - Path=/second-service/**
          filters:
#            - AddRequestHeader=second-request, second-request-header2
#            - AddResponseHeader=second-response, second-response-header2
            - name: CustomFilter
            - name: LoggingFilter
              args:
                baseMessage: Hi, there
                preLogger: true
                postLogger: true

apigateway로 first-service가 정상 요청되는지 확인!

http://localhost:8000/first-service/welcome