Spring Cloud Kubernetes + Spring Cloud Gateway:无法找到k8s服务的实例 [英] Spring Cloud Kubernetes + Spring Cloud Gateway: Unable to find instance for k8s service

问题描述

我正在使用Spring Cloud Kubernetes + Spring Cloud Gateway(SCG)，但在将应用程序部署到GKE时遇到了一些麻烦. SCG找不到k8s服务，我仍然收到此错误:

I am using Spring Cloud Kubernetes + Spring Cloud Gateway(SCG) and I have some trouble to deploy my app on GKE. SCG does not find k8s service, I still get this error:

There was an unexpected error (type=Service Unavailable, status=503).
Unable to find instance for uiservice

uiservice是Angular应用.

uiservice is Angular app.

当我查看.../actuator/gateway/routes时，我得到以下结果:

When I take a look at .../actuator/gateway/routes I have this result:

[
  {
    "route_id": "CompositeDiscoveryClient_gateway",
    "route_definition": {
      "id": "CompositeDiscoveryClient_gateway",
      "predicates": [
        {
          "name": "Path",
          "args": {
            "pattern": "/gateway/**"
          }
        }
      ],
      "filters": [
        {
          "name": "RewritePath",
          "args": {
            "regexp": "/gateway/(?<remaining>.*)",
            "replacement": "/${remaining}"
          }
        }
      ],
      "uri": "lb://gateway",
      "order": 0
    },
    "order": 0
  },
  {
    "route_id": "CompositeDiscoveryClient_uiservice",
    "route_definition": {
      "id": "CompositeDiscoveryClient_uiservice",
      "predicates": [
        {
          "name": "Path",
          "args": {
            "pattern": "/uiservice/**"
          }
        }
      ],
      "filters": [
        {
          "name": "RewritePath",
          "args": {
            "regexp": "/uiservice/(?<remaining>.*)",
            "replacement": "/${remaining}"
          }
        }
      ],
      "uri": "lb://uiservice",
      "order": 0
    },
    "order": 0
  },
  {
    "route_id": "uiservice_route",
    "route_definition": {
      "id": "uiservice_route",
      "predicates": [
        {
          "name": "Path",
          "args": {
            "_genkey_0": "/*"
          }
        }
      ],
      "filters": [],
      "uri": "lb://uiservice",
      "order": 0
    },
    "order": 0
  },
  ....
]

请注意，由于以下原因而发现了很多服务:"route_id": "CompositeDiscoveryClient_gateway"和"route_id": "CompositeDiscoveryClient_uiservice"，这些路由不是我的(我没有定义它们).

Please note that services are well discovered because of that: "route_id": "CompositeDiscoveryClient_gateway" and "route_id": "CompositeDiscoveryClient_uiservice", those routes are not mine (I did not define them).

我看了这篇文章:

I took a look at this post:How to set up Spring Cloud Gateway application so it can use the Service Discovery of Spring Cloud Kubernetes? without success.

我的配置:

   spring:
      profiles:
        active: prod
      cloud:
        kubernetes:
          reload:
            enabled: true
        gateway:
          discovery:
            locator:
              enabled: true 
              lower-case-service-id: true
          globalcors:
            cors-configurations: 
              '[/**]':
                allowedOrigins: uiservice
                allowedMethods: "*"
                allowCredentials: true
                maxAge: 7200
                allowedHeaders: "*"
                exposedHeaders:
                - "Access-Control-Allow-Origin"
                - "Access-Control-Allow-Methods"
                - "Access-Control-Max-Age"
                - "Access-Control-Allow-Headers"
                - "Cache-Control"
                - "Authorization"
                - "Content-Type"
          routes:
          #======UISERVICE========
          - id: uiservice_route
            uri: lb://uiservice 
            predicates:
            - Path=/* #default route

          - id: uiservice_route_assets
            uri: lb://uiservice
            predicates:
            - Path=/assets/**
   management:
      endpoints:
        web:
          exposure:
            include: "*"
      endpoint:
          restart:
            enabled: true

此外，如何禁用网关自动发现?我不要"route_id": "CompositeDiscoveryClient_gateway"

Also, how can I disable gateway autodiscovering? I don't want the "route_id": "CompositeDiscoveryClient_gateway"

依赖项:

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

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Greenwich.SR2</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

感谢您的帮助

推荐答案

我在失去一个下午后终于找到了解决方案.我认为在使用功能区时发现服务存在问题.我使用k8s dns服务发现而不是依赖Ribbon，所以我的新配置是:

I finally found a solution after losing an afternoon. I think there is an issue on service discovering when using Ribbon. I use k8s dns service discovering instead of relying on Ribbon, so my new config is:

routes:
- id: uiservice_route
  uri: http://uiservice:4200 # switch 'lb://' to 'http://'
  predicates:
  - Path=/* 

K8s uiservice配置:

K8s uiservice config:

apiVersion: v1
kind: Service
metadata:
  name: uiservice
spec:
  sessionAffinity: ClientIP
  selector:
    app: uiservice
  ports:
    - name: http
      port: 4200
      targetPort: ui-port

一个新的问题出现了:由于k8s服务本身就是这样做，为什么要使用Ribbon来平衡请求?

A new question arised: Why using Ribbon to load balance requests since k8s services natively do that?

这篇关于Spring Cloud Kubernetes + Spring Cloud Gateway:无法找到k8s服务的实例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！