Cannot connect to Go GRPC server running in local Docker container

Question

I have a go grpc service. I'm developing on a mac, sierra. When running a grpc client against the service locally, all is well, but when running same client against same service in the docker container I get this error:

transport: http2Client.notifyError got notified that the client transport was broken EOF.
FATA[0000] rpc error: code = Internal desc = transport is closing

this is my docker file:

FROM golang:1.7.5

RUN mkdir -p /go/src/github.com/foo/bar
WORKDIR /go/src/github.com/foo/bar

COPY . /go/src/github.com/foo/bar
# ONBUILD RUN go-wrapper download
RUN go install

ENTRYPOINT /go/bin/bar

EXPOSE 51672

my command to build the image:

docker build -t bar .

my command to launch the docker container:

docker run -p 51672:51672 --name bar-container bar

Other info:

• client program runs fine from within the docker container
• connecting to a regular rest endpoint works fine (http2, grpc related?)

• running the lsof command in OS X yields these results

  $lsof -i | grep 51672
  com.docke   984 oldDave   21u  IPv4 0x72779547e3a32c89      0t0  TCP *:51672 (LISTEN)
  com.docke   984 oldDave   22u  IPv6 0x72779547cc0fd161      0t0  TCP localhost:51672 (LISTEN)
  

• here's a snippet of my server code:

  server := &Server{}
  endpoint := "localhost:51672"
  lis, err := net.Listen("tcp", endpoint)
  if err != nil {
      log.Fatalf("failed to listen: %v", err)
  }
  
  s := grpc.NewServer(grpc.Creds(creds))
  
  pb.RegisterExpServiceServer(s, server)
  
  // Register reflection service on gRPC server.
  reflection.Register(s)
  
  log.Info("Starting Exp server: ", endpoint)
  
  if err := s.Serve(lis); err != nil {
      log.Fatalf("failed to serve: %v", err)
  }
  

Answer 1

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