Gateway 网关报错 SERVICE_UNAVAILABLE

背景

在搭建微服务框架的时候使用的Gateway网关，网关通了，但是在调用服务的时候报了异常。

SERVICE_UNAVAILABLE "Unable to find instance for admin-auth"

相关配置

admin-gateway.yml 依赖

<dependencies>
        <!-- 原因：该版本SpringCloud不再默认优先加载bootstrap.yml文件，解决办法：添加spring-cloud-starter-bootstrap依赖 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-bootstrap</artifactId>
        </dependency>

        <!-- SpringCloud Gateway -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

        <!-- SpringCloud Alibaba Nacos -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <!-- SpringCloud Alibaba Nacos Config -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>

        <!-- SpringCloud Alibaba Sentinel -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

        <!-- SpringCloud Alibaba Sentinel Gateway -->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-sentinel-gateway</artifactId>
        </dependency>
        <!-- Sentinel Datasource Nacos -->
        <dependency>
            <groupId>com.alibaba.csp</groupId>
            <artifactId>sentinel-datasource-nacos</artifactId>
        </dependency>
</dependencies>

配置

server:
  port: 10010

spring:
  application:
    name: @[email protected]
  cloud:
    nacos:
      server-addr: 127.0.0.1:8848 # nacos地址
    gateway:
      discovery:
        locator:
          enabled: true
      routes:
        - id: admin-auth # 路由标识，必须唯一
          uri: lb://admin-auth # 路由的目标地址，lb为load balance，负载均衡
          predicates: # 路由断言，判断请求是否符合规则
            - Path=/admin-auth/**  # 判断请求是否以/user开头

解决

因为Gateway底层使用了Ribbon作为负载均衡，依赖中没有加入相关的组件，所以不可以进行正确的分发。加入即可：

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-loadbalancer</artifactId>
        </dependency>