ASP.NET Core 2.2 Kubernetes Inress：未找到自定义路径的静态内容 [英] ASP.Net Core 2.2 Kubernetes Ingress: not found static content for custom path

问题描述

我有以下ingress.yml：

apiVersion: extensions/v1beta1
kind: Ingress 
metadata:
  name: ingress 
  namespace: default 
  annotations:
    kubernetes.io/ingress.class: "nginx" 
    nginx.ingress.kubernetes.io/ssl-redirect: "false" 
    nginx.ingress.kubernetes.io/rewrite-target: /$2
  labels: 
    app: ingress 
spec:
  rules:  
    - host: 
      http:   
        paths:
          - path: /apistarter(/|$)(.*)
            backend:
              serviceName: svc-aspnetapistarter
              servicePort: 5000
          - path: //apistarter(/|$)(.*)
            backend:
              serviceName: svc-aspnetapistarter
              servicePort: 5000

部署ASP.NET Core2.2API应用程序并导航到http://localhost/apistarter/后，浏览器调试器控制台在加载静态内容和Java脚本时显示错误。此外，导航到http://localhost/apistarter/swagger/index.html会导致

Fetch error Not Found /swagger/v2/swagger.json

对于使用不同路径前缀的多个微服务，我使用相同的入口。它运行在我本地的Kubernetes集群上，使用的是microk8。目前还没有出现在任何云提供商身上。我已签出How to configure an ASP.NET Core multi microservice application and Azure AKS ingress routes so that it doesn't break resources in the wwwroot folder和https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/proxy-load-balancer?view=aspnetcore-2.1，但这些都没有帮助。

推荐答案

按照以下步骤运行代码：

1. 入口：从ingress.yml移除URL重写

apiVersion: extensions/v1beta1
kind: Ingress 
metadata:
  name: ingress 
  namespace: default 
  annotations:
    kubernetes.io/ingress.class: "nginx" 
    nginx.ingress.kubernetes.io/ssl-redirect: "false" 
  labels: 
    app: ingress 
spec:
  rules:  
    - host: 
      http:   
        paths:
          - path: /apistarter # <---
            backend:
              serviceName: svc-aspnetapistarter
              servicePort: 5000

2. 部署：将环境变量与ingress.yml中的路径基一起传递

apiVersion: apps/v1
kind: Deployment
# ..
spec:
  # ..
  template:
    # ..
    spec:
      # ..
      containers:
        - name: test01
          image: test.io/test:dev
          # ...
          env:
            # define custom Path Base (it should be the same as 'path' in Ingress-service)
            - name: API_PATH_BASE # <---
              value: "apistarter"

3. 程序：启用Program.cs中的环境参数加载

var builder = new WebHostBuilder()
    .UseContentRoot(Directory.GetCurrentDirectory())
    // ..
    .ConfigureAppConfiguration((hostingContext, config) =>
    {
        // ..  
        config.AddEnvironmentVariables(); // <---
        // ..
    })
    // ..

4. 启动：在Startup.cs中应用UsePath BaseMiddleware

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    private readonly IConfiguration _configuration;

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        var pathBase = _configuration["API_PATH_BASE"]; // <---

        if (!string.IsNullOrWhiteSpace(pathBase))
        {
            app.UsePathBase($"/{pathBase.TrimStart('/')}");
        }

        app.UseStaticFiles(); // <-- StaticFilesMiddleware must follow UsePathBaseMiddleware

        // ..

        app.UseMvc();
    }

    // ..
}

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