帶有docker的springbooteureka被拒絕連接

我有一個在本地作業的多服務平臺。它使用 Spring Boot 2.7、Spring Eureka Docker 和 Feign 進行服務間呼叫。現在我已經通過 Docker Compose 啟動了它，當嘗試相互請求時，服務似乎失敗了。然而，我看到在 Eureka 儀表板上注冊的所有服務：

當我在 API-GATEWAY 中收到呼叫時，它會呼叫 IDENTITY-SERVICE。

呼叫者看起來像這樣：主類有：

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients("com.xxx.apigateway.service.feign")
public class ApiGatewayApplication {
...
}

呼叫其他服務的服務是：

@FeignClient(name = "identity-service")
public interface IdentityServiceClient {
    @RequestMapping(method = RequestMethod.GET, value = "/api/{scannedId}")
    ApiKey getApiKey(@PathVariable String scannedId);
}

而application.properties檔案（所有服務基本相同）是：

server.port=8081
eureka.client.serviceUrl.defaultZone=http://eureka:@discovery-service:8010/eureka

eureka.client.register-with-eureka=true
eureka.instance.instance-id=${spring.application.name}:${spring.application.instance_id:${random.value}}
eureka.instance.hostname=${HOST_NAME:localhost}

spring.config.import=optional:configserver:http://config-service:8888
spring.cloud.config.uri=http://config-service:8888
spring.cloud.config.name=config-service

spring.cloud.config.discovery.enabled = false
spring.main.web-application-type=reactive

這是 docker-compose 的一部分：

discovery-service:
    container_name: discovery-service
    image: discovery-service
    pull_policy: never
    environment:
      - SPRING_PROFILES_ACTIVE=docker
    expose:
      - "8010"
    ports:
      - "8010:8010"
    restart: unless-stopped
    networks:
      - mynet
  api-gateway:
    container_name: api-gateway
    image: api-gateway
    pull_policy: never
    environment:
      - SPRING_PROFILES_ACTIVE=docker
    expose:
      - "8081"
    ports:
      - "8081:8081"
    restart: unless-stopped
    depends_on:
      - config-service
      - discovery-service
  identity-service:
    container_name: identity-service
    image: identity-service
    pull_policy: never
    environment:
      - SPRING_PROFILES_ACTIVE=docker
    restart: unless-stopped
    depends_on:
      - config-service
      - discovery-service
      - api-gateway

嘗試呼叫 IDENTITY-SERIVCE 時 API_GATEWAY 引發的錯誤是：

api-gateway           | 2022-09-28 15:10:00.889 DEBUG 1 --- [nio-8081-exec-1] u.f.m.a.s.feign.IdentityServiceClient    : [IdentityServiceClient#getAllApiKeys] ---> GET http://identity-service/api/all HTTP/1.1
api-gateway           | 2022-09-28 15:10:00.889 DEBUG 1 --- [nio-8081-exec-1] u.f.m.a.s.feign.IdentityServiceClient    : [IdentityServiceClient#getAllApiKeys] ---> END HTTP (0-byte body)
api-gateway           | 2022-09-28 15:10:00.939  WARN 1 --- [nio-8081-exec-1] o.s.c.l.core.RoundRobinLoadBalancer      : No servers available for service: identity-service
api-gateway           | 2022-09-28 15:10:00.942 DEBUG 1 --- [nio-8081-exec-1] u.f.m.a.s.feign.IdentityServiceClient    : [IdentityServiceClient#getAllApiKeys] <--- HTTP/1.1 503 (51ms)
api-gateway           | 2022-09-28 15:10:00.942 DEBUG 1 --- [nio-8081-exec-1] u.f.m.a.s.feign.IdentityServiceClient    : [IdentityServiceClient#getAllApiKeys] 
api-gateway           | 2022-09-28 15:10:00.942 DEBUG 1 --- [nio-8081-exec-1] u.f.m.a.s.feign.IdentityServiceClient    : [IdentityServiceClient#getAllApiKeys] Load balancer does not contain an instance for the service identity-service
api-gateway           | 2022-09-28 15:10:00.942 DEBUG 1 --- [nio-8081-exec-1] u.f.m.a.s.feign.IdentityServiceClient    : [IdentityServiceClient#getAllApiKeys] <--- END HTTP (75-byte body)
api-gateway           | 2022-09-28 15:10:00.942 ERROR 1 --- [nio-8081-exec-1] u.f.m.a.service.feign.FeignErrorDecoder  : decode exception method: IdentityServiceClient#getAllApiKeys()
api-gateway           | 2022-09-28 15:10:00.942 ERROR 1 --- [nio-8081-exec-1] u.f.m.a.service.feign.FeignErrorDecoder  : Feign error: HTTP/1.1 503
api-gateway           | 
api-gateway           | feign.Response$ByteArrayBody@7d9a6870
api-gateway           | 2022-09-28 15:10:00.942 ERROR 1 --- [nio-8081-exec-1] u.f.m.a.service.feign.FeignErrorDecoder  : Throwing exception: null
**...**
api-gateway           | feign.RetryableException: Connection refused executing GET http://identity-service/api/all
api-gateway           |     at feign.FeignException.errorExecuting(FeignException.java:268) ~[feign-core-11.8.jar:na]
api-gateway           |     Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
api-gateway           | Error has been observed at the following site(s):
api-gateway           |     *__checkpoint ? org.springframework.web.filter.reactive.ServerWebExchangeContextFilter [DefaultWebFilterChain]
api-gateway           |     *__checkpoint ? org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
api-gateway           |     *__checkpoint ? HTTP GET "/providers/b691eda6-f021-4534-8b4d-aaa5a27584d" [ExceptionHandlingWebHandler]
api-gateway           | Original Stack Trace:
api-gateway           |         at feign.FeignException.errorExecuting(FeignException.java:268) ~[feign-core-11.8.jar:na]
**...**
api-gateway           | Caused by: java.net.ConnectException: Connection refused

由于這在 Docker Compose 之外有效，我認為這是罪魁禍首，但我不確定以及如何解決這個問題。

uj5u.com熱心網友回復：

我以前也遇到過同樣的問題。通過添加這個：

eureka.instance.prefer-ip-address=true

并洗掉它：

# eureka.instance.hostname=${HOST_NAME:localhost}

為我作業。

標籤：弹簧靴码头工人春云spring-cloud-feign

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