阿里springcloud alibaba 閘道器gateway + nacos 遇到503錯誤

FH-Admin發表於2021-12-10

POM檔案依賴

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
        <version>3.0.2</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

nacos的版本如下:

<properties>
    <nacos.version>2021.1</nacos.version>
</properties>

gateway的application.yml檔案配置如下:

//fhadmin.cn
server:
  port: 9040

spring:
  application:
    name: gateway
  cloud:
    gateway:
      routes:
        - id: consumer
          uri: lb://consumer
          #          uri: http://localhost:9010
          predicates:
            - Path=/**
    nacos:
      discovery:
        server-addr: localhost:8848
        metadata:
          preserved.heart.beat.interval: 3 #心跳間隔。時間單位:秒。心跳間隔
          preserved.heart.beat.timeout: 6 #心跳暫停。時間單位:秒。 即服務端6秒收不到客戶端心跳,會將該客戶端註冊的例項設為不健康:
          preserved.ip.delete.timeout: 9 #Ip刪除超時。時間單位:秒。即服務端9秒收不到客戶端心跳,會將該客戶端註冊的例項刪除:
當我透過uri: http://localhost:9010去呼叫服務時,是可以呼叫的,但是當我用uri lb://consumer時就無法呼叫服務,報錯503.

解決辦法是:
加入feign依賴。
<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
        <version>3.0.2</version>
    </dependency>

    <!--fegin元件-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
        <version>3.0.2</version>
    </dependency>
    <!-- Feign Client for loadBalancing -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-loadbalancer</artifactId>
        <version>3.0.2</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
猜測原因:nacos相容feign,feign整合ribbon,預設實現負載均衡;或許是nacos不相容springcloud gateway自帶的ribbon。實現案例 fhadmin.cn
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