404错误：尝试在docker内部部署ocelot网关来调用微服务

问题描述

我们开发了两个 ASP.NET CORE (5.0) 微服务​​并将它们部署在 docker 中 http://localhost:28621/stock http://localhost:62362/user

两者都可以通过浏览器轻松访问。

我们已经将 ocelot 网关用于 API 网关。 当我们在 docker 中部署它时，我们得到了以下错误

warn: Ocelot.DownstreamRouteFinder.Middleware.DownstreamRouteFinderMiddleware[0] requestId: 0HM8658EF6KHC:00000002,prevIoUsRequestId: no prevIoUs request id,message: DownstreamRouteFinderMiddleware setting pipeline errors. IDownstreamRouteFinder returned Error Code: UnabletoFindDownstreamRouteError Message: Failed to match Route configuration for upstream path: /user,verb: GET. warn: Ocelot.Responder.Middleware.ResponderMiddleware[0] requestId: 0HM8658EF6KHC:00000002,message: Error Code: UnabletoFindDownstreamRouteError Message: Failed to match Route configuration for upstream path: /user,verb: GET. errors found in ResponderMiddleware. Setting error response for request path:/user,request method: GET ----------------------------------------- -------------------------------------------------- -----

ocelot.Development.json 如下

 {
  "Routes": [
    {
      "DownstreamPathTemplate": "/user","DownstreamScheme": "http","DownstreamHostAndPorts": [
        {
          "Host": "localhost","Port": 62362
        }
      ],"UpstreamPathTemplate": "/user","UpstreamHttpMethod": [ "Get" ]
    },{
      "DownstreamPathTemplate": "/stock","Port": 28621
        }
      ],"UpstreamPathTemplate": "/stock","UpstreamHttpMethod": [ "Get" ]
    }

  ],"GlobalConfiguration": {
    "BaseUrl": "https://localhost:5021"
  }
}

---

startup.cs

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddOcelot();

    }

    public async void Configure(IApplicationBuilder app,IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        app.UseRouting();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
        await app.USEOcelot();
    }
}

---

program.cs

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
              Host.CreateDefaultBuilder(args)
                   .ConfigureAppConfiguration((hostingContext,config) =>
                   {
                       config.AddJsonFile($"ocelot.                                          
 {hostingContext.HostingEnvironment.EnvironmentName}.json",true,true);
                   })
                  .ConfigureWebHostDefaults(webBuilder =>
                  {
                      webBuilder.UseStartup<Startup>();
                  });
    }

---

请指导我们哪里出错了 我们使用的是.net core 5.0

谢谢

解决方法

您的 Ocelot 容器无法使用“DownstreamHostAndPorts”设置访问其他容器的服务：{'Host': 'localhost'}。容器的'localhost'和宿主机的'localhost'不一样！

要解决这个问题，请朝这个方向看：

• 创建 Docker 网络
• 使用 --network-alias 标志在同一网络下运行所有​​三个容器
• 在 Ocelot json 文件中使用网络别名和默认端口（因为容器可以直接相互通信，所以不需要映射外部端口！）