I am trying to get a brand new ASP.NET core MVC web application running from within a Docker container on my windows 10 machine.
I'm no docker expert but the port doesn't seem to get bound on the host. I get a response from within the container, but not from the host. The 2.2 sample works fine for me.
dotnet --version
3.0.100-preview6-012264
Steps to reproduce:
mkdir aspnetcore3_test
cd .\aspnetcore3_test\
mkdir aspnetapp
cd .\aspnetapp\
dotnet new mvc
cd ..
dotnet new sln
dotnet sln "aspnetcore3_test.sln" add "aspnetapp/aspnetapp.csproj"
Create a docker file with the following content:
FROM mcr.microsoft.com/dotnet/core/sdk:3.0 AS build
WORKDIR /app
# copy csproj and restore as distinct layers
COPY *.sln .
COPY aspnetapp/*.csproj ./aspnetapp/
RUN dotnet restore ./aspnetapp/*.csproj
# copy everything else and build app
COPY aspnetapp/ ./aspnetapp/
WORKDIR /app/aspnetapp
RUN dotnet publish -c Release -o out
FROM mcr.microsoft.com/dotnet/core/aspnet:3.0 AS runtime
WORKDIR /app
COPY --from=build /app/aspnetapp/out ./
EXPOSE 80
ENTRYPOINT ["dotnet", "aspnetapp.dll"]
Then do the docker bits:
docker build -t dockertest .
docker run --rm -it --name=dockertest dockertest:latest -p 80:80
Docker run outputs the following:
warn: Microsoft.AspNetCore.DataProtection.Repositories.FileSystemXmlRepository[60]
Storing keys in a directory '/root/.aspnet/DataProtection-Keys' that may not be persisted outside of the container. Protected data will be unavailable when container is destroyed.warn: Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager[35]
No XML encryptor configured. Key {5b22d641-4632-4440-8f7d-8ad9b5e48098} may be persisted to storage in unencrypted form.
info: Microsoft.Hosting.Lifetime[0]
Now listening on: http://[::]:80
info: Microsoft.Hosting.Lifetime[0]
Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]
Content root path: /app
With the container running Firefox says that it was unable to connect and docker port dockertest comes up empty
docker exec -i -t dockertest curl localhost spits out the template MVC app HTML
By adding the -p 80:80 after the name of the image, you're actually passing -p 80:80 as the args for the image executable, rather than as an arg for docker itself. The solution is to move that to before the image name:
docker run --rm -it --name=dockertest -p 80:80 dockertest:latest