How can I define Host_Port in dockerfile

Question

I am trying to debug my blazor server app application by running it into docker container. My application is using AD B2C which is configured for 4100 Host_port. I have created my dockerfile which is creating image and starting docker container as well. The problem is I'm trying to define Host_Port in dockerfile so that docker run command can pick it up form dockerfile. Firstly, Is it possible? If yes then how?

FROM mcr.microsoft.com/dotnet/aspnet:7.0 AS base
WORKDIR /app
EXPOSE 443

FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
WORKDIR /src
COPY ["TS.UI/TS.UI.csproj", "TS.WebUI/"]
COPY ["TS.Common/TS.Common.csproj", "TS.Common/"]
COPY ["TS.Lab/TS.Lab.csproj", "TS.Lab/"]
RUN dotnet restore "TS.WebUI/TS.WebUI.csproj"
COPY . .
WORKDIR "/src/TS.WebUI"
RUN dotnet build "TS.UI.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "TS.UI.csproj" -c Release -o /app/publish /p:UseAppHost=false

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "TS.UI.dll"]

Here, I tried by adding ENV ASPNETCORE_HTTPS_PORT=4100 but it is also not working.

I also tried with Expose 4100 but that is also creating on localhost:{someRandomPort}:{ExposePort}

I have done it using compose. And it is working fine. For knowledge perspective I'm just trying if it is possible or not.

Answer 1

launchSettings.json

"Docker": {
      "commandName": "Docker",
      "launchBrowser": true,
      "launchUrl": "{Scheme}://{ServiceHost}:{ServicePort}",
      "environmentVariables": {
        "ASPNETCORE_URLS": "https://+:443;http://+:80"
      },
      "publishAllPorts": false,
      "useSSL": true,
      "sslPort": 4100
    }

We can provide specific port using sslPort.