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我有一个 .Net Core 3.1 WebAPI 作为 Docker 容器运行 + Eureka 服务器也作为 Docker 运行。当我从 Visual Studio 运行 API 时，它会成功注册到 Eureka Docker 实例，我可以在 Eureka 控制台中看到该服务。但是，一旦我对 API 进行 dockerize 并运行它，我就会收到如下连接错误：

fail: Steeltoe.Discovery.Eureka.Transport.EurekaHttpClient[0]
productsapi_1   |       RegisterAsync Failed
productsapi_1   | System.Net.Http.HttpRequestException: Connection refused
productsapi_1   |  ---> System.Net.Sockets.SocketException (111): Connection refused
productsapi_1   |    at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
productsapi_1   |    --- End of inner exception stack trace ---
productsapi_1   |    at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
......
productsapi_1   |    at Steeltoe.Discovery.Eureka.Transport.EurekaHttpClient.RegisterAsync(InstanceInfo info)
productsapi_1   | fail: Steeltoe.Discovery.Eureka.DiscoveryClient[0]
productsapi_1   |       Register Failed
productsapi_1   | System.Net.Http.HttpRequestException: Connection refused
productsapi_1   |  ---> System.Net.Sockets.SocketException (111): Connection refused
productsapi_1   |    at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
productsapi_1   |    --- End of inner exception stack trace ---
productsapi_1   |    at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
.....
productsapi_1   |    at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
productsapi_1   |    at System.Net.Http.HttpClient.FinishSendAsyncBuffered(Task`1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean 
disposeCts)
productsapi_1   |    at Steeltoe.Discovery.Eureka.Transport.EurekaHttpClient.RegisterAsync(InstanceInfo info)
productsapi_1   |    at Steeltoe.Discovery.Eureka.DiscoveryClient.RegisterAsync()
productsapi_1   | info: Steeltoe.Discovery.Eureka.DiscoveryClient[0]
productsapi_1   |       Registartion fail. HeartBeat not start
productsapi_1   | fail: Steeltoe.Discovery.Eureka.Transport.EurekaHttpClient[0]
productsapi_1   |       DoGetApplicationsAsync Failed
productsapi_1   | System.Net.Http.HttpRequestException: Connection refused
productsapi_1   |  ---> System.Net.Sockets.SocketException (111): Connection refused
.....

这是在运行docker -compose up 之后。Eureaka 和 API 容器都已启动，但服务似乎没有注册。这就是我的 WebAPI 的样子：

启动.cs

 public void ConfigureServices(IServiceCollection services)
    {
        .....       
        services.AddDbContext<ApplicationDbContext>(o => o.UseMySql(Configuration.GetConnectionString("mysqlconnection")));
        services.AddDiscoveryClient(Configuration);
    }
    
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {        
       .....
        app.UseHttpsRedirection();
        app.UseRouting();
        app.UseAuthorization();
        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllers();
        });
        app.UseDiscoveryClient();
    }

码头工人撰写

version: '3.4'
services:
  productsapi:
    build: .
    ports: 
      - "5050:5000"
    depends_on:
      - eurekaserver
   
  eurekaserver:
    image: steeltoeoss/eureka-server:latest
    ports:
      - '8761:8761'

应用设置.json

     {
     ...
  "AllowedHosts": "*",
  ...
  "eureka": {
    "client": {
      "shouldRegisterWithEureka": true,
      "serviceUrl": "http://eurekaserver:8761/eureka",
      "ValidateCertificates": false
    },
    "instance": {
      "appName": "ProductService",
      "port": "5050",
      "hostName": "localhost"
    }
  }
}

我错过了什么？

4

2 回答 2

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我认为尤里卡很可能还没有准备好接收请求，这就是连接被拒绝错误的原因。根据我的经验，Eureka 需要 7-15（ish）秒才能启动。Docker compose 将按依赖顺序启动容器，但在启动下一个之前不会等待第一个的就绪状态。有一些选项可以更改启动行为，或者可以构建您的应用程序来处理这种性质的瞬时故障。

Steeltoe 旨在处理此类故障，并将尝试（默认每 30 秒）向 Eureka 发送一次心跳。如果第一个请求失败（因为 Eureka 还没有启动），那么下一个应该会成功。

您共享的错误消息（以及您打开的github 问题）表明您使用的是 Steeltoe 2.1.1，它是在近 3 年前发布的（在 .NET Core 3.1 之前）。我不认为这可能是问题的根本原因，但我强烈建议使用较新的版本。

于 2021-07-23T18:53:33.513 回答
0

终于让它与这个OSS调整一起工作。我的 appsettings.json 现在看起来像这样：

 {
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "ConnectionStrings": {
    "mysqlconnection": "server=mysqldata;port=3306;database=ProductsDB;userid=xxxx;password=xxxx;"
  },
  "PaymentsServiceUri": "http://PaymentService/api/payment",
  "spring": {
    "application": {
      "name": "ProductService"
    }
  },
  "eureka": {
    "client": {
      "shouldRegisterWithEureka": true,
      "serviceUrl": "http://eurekaserver:8761/eureka",
      "ValidateCertificates": false,
      "RegistryFetchIntervalSeconds": "15"
    },
    "instance": {
      "appName": "ProductService",
      "port": "5050",
      "hostName": "localhost",
      "LeaseRenewalIntervalInSeconds": "15"
    }
    }
  }
于 2021-07-25T11:47:22.403 回答