c# Grpc Client 无法连接到本地主机上的 docker(for windows) 容器中托管的 Grpc Server

Question

Grpc Greeter Service我和客户一起做了一个简单的。当服务托管在本地主机上时，客户端能够调用 rpc 并接收响应。但是，当服务在本地主机上的 docker 容器内运行时，客户端无法连接到该服务。

** Grpc 服务服务器 **

namespace GreeterServer
{
    class Program
    {
        private readonly static ManualResetEvent shutdown = new ManualResetEvent(false);
        static void Main(string[] args)
        {
            int port = 5000;
            Console.WriteLine("Hello World!");
            Server server = new Server{
                Services = {GreeterService.BindService(new GreeterController())},
                Ports = {new ServerPort("localhost", port, ServerCredentials.Insecure)}
            };
            server.Start();
            Console.WriteLine("Grpc Server started");
            Console.Read();
            shutdown.WaitOne();
        }
    }
}

** Grpc 服务的 Dockerfile **

FROM microsoft/dotnet:2.1-sdk as base
WORKDIR /app

COPY *.csproj .
RUN dotnet restore

COPY . .
RUN dotnet build -c Release -o out

FROM microsoft/dotnet:2.1-runtime
WORKDIR /app
COPY --from=base /app/out .
ENTRYPOINT ["dotnet", "GreeterServer.dll"]
EXPOSE 5000

** Grpc 客户端 **

namespace GreeterClient
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Console.WriteLine("Hello World!");
                Channel channel = new Channel("127.0.0.1:5000", ChannelCredentials.Insecure);
                GreeterService.GreeterServiceClient client = new GreeterService.GreeterServiceClient(channel);
                HelloRequest request = new HelloRequest
                {
                    Message = "Hi From Client"
                };
                HelloResponse response = client.SayHello(request);
                Console.WriteLine(response.Message);
            }
            catch(Exception e)
            {
                Console.WriteLine(e.ToString());
            }

        }
    }
}

** 来自 Grpc 客户端的堆栈跟踪 **

Grpc.Core.RpcException: Status(StatusCode=Unknown, Detail="Stream removed")
   at Grpc.Core.Internal.AsyncCall`2.UnaryCall(TRequest msg) in T:\src\github\grpc\src\csharp\Grpc.Core\Internal\AsyncCall.cs:line 75
   at Grpc.Core.DefaultCallInvoker.BlockingUnaryCall[TRequest,TResponse](Method`2 method, String host, CallOptions options, TRequest request) in T:\src\github\grpc\src\csharp\Grpc.Core\DefaultCallInvoker.cs:line 46
   at Grpc.Core.Interceptors.InterceptingCallInvoker.<BlockingUnaryCall>b__3_0[TRequest,TResponse](TRequest req, ClientInterceptorContext`2 ctx) in T:\src\github\grpc\src\csharp\Grpc.Core\Interceptors\InterceptingCallInvoker.cs:line 51
   at Grpc.Core.ClientBase.ClientBaseConfiguration.ClientBaseConfigurationInterceptor.BlockingUnaryCall[TRequest,TResponse](TRequest request, ClientInterceptorContext`2 context, BlockingUnaryCallContinuation`2 continuation) in T:\src\github\grpc\src\csharp\Grpc.Core\ClientBase.cs:line 174
   at Grpc.Core.Interceptors.InterceptingCallInvoker.BlockingUnaryCall[TRequest,TResponse](Method`2 method, String host, CallOptions options, TRequest request) in T:\src\github\grpc\src\csharp\Grpc.Core\Interceptors\InterceptingCallInvoker.cs:line 48
   at Greeter.Proto.GreeterService.GreeterServiceClient.SayHello(HelloRequest request, CallOptions options) in F:\c#\GrpcPracticeWithDocker\GreeterClient\GrpcClasses\GreeterGrpc.cs:line 70
   at Greeter.Proto.GreeterService.GreeterServiceClient.SayHello(HelloRequest request, Metadata headers, Nullable`1 deadline, CancellationToken cancellationToken) in F:\c#\GrpcPracticeWithDocker\GreeterClient\GrpcClasses\GreeterGrpc.cs:line 66
   at GreeterClient.Program.Main(String[] args) in F:\c#\GrpcPracticeWithDocker\GreeterClient\Program.cs:line 23

Answer 1

(1) 不要在 docker 内的 GRPC 服务器中使用 localhost，它将不起作用，因为无法从 docker 外部访问环回 localhost，您需要监听所有接口，因此请使用“0.0.0.0”，例如。

端口 = {new ServerPort("0.0.0.0", 端口, ServerCredentials.Insecure)}

以下是涉及此问题的堆栈：无法连接到在本地 Docker 容器中运行的 Go GRPC 服务器

（2）我也有同样的问题。我发现问题是我在使用 docker run 或 docker compose 时没有使用交互式 shell。如果您使用 docker run，则需要使用 -it 命令，对于 docker compose，您需要使用 stdin_open: true 和 tty:true。

Docker 运行示例

docker run --name grpcserver -p 8081:8081 -it -d grpcserver

Docker 撰写示例

version: '3'

services:
  web:
    container_name: mynginx
    build:
      context: ./nginx
      dockerfile: Dockerfile
    ports:
      - 8080:80
  grpcserver:
    image: grpcserver
    container_name: grpcserver
    stdin_open: true
    tty: true
    build:
      context: .
      dockerfile: Dockerfile

这是另一个讨论此问题的堆栈： Interactive shell using Docker Compose

祝你好运！