dockerizing.Net API 时如何修复端口错误

Question

I am trying to dockerize my.Net API and I cannot seem to get access to it after I create a container with it. I attempt to send a request using postman but I get a "Socket Hang Up" error. I believe this has to do with the ports I am using although I am not sure how to fix it. Below is all the information I could gather.

Dockerfile:

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /app

COPY WebAPI.csproj .
RUN dotnet restore "WebAPI.csproj"

COPY . ./
RUN dotnet publish "WebAPI.csproj" -c Release -o /publish

RUN dotnet build

FROM build AS final
WORKDIR /app
COPY --from=build /publish .
EXPOSE 5000
ENTRYPOINT ["dotnet", "WebAPI.dll"]

Commands:

docker build -t webapi:latest .    
docker run -p 5000:5000 webapi:latest

Postman Proxy:

127.0.0.1:5000

PS I have tried changing the ports in multiple ways, changing proxy settings for postman and nothing seems to work

Answer 1

Microsoft has set the environment variable ASPNETCORE_URLS to http://+:80/ in the aspnet image, which makes your application listen on port 80.

So your run command should map port 80 like this

docker run -p 5000:80 webapi:latest

Then your API will be available on http://localhost:5000/

Note that Swagger is only available when your application runs in Development mode and the Docker environment is not considered development. So by default, Swagger won't be available.