CODEWITHSUNDEEP
c#docker.net-core
mmffggss
mmffggss

Reputation: 215

how to set the environment of dotnet core in docker?

I want to be able to run dotnet core by docker in different environments(for now just development and production) but my docker always start in production environment. here is my docker file:

FROM microsoft/dotnet:sdk AS build-env

WORKDIR /app

# Copy csproj and restore as distinct layers
COPY *.csproj ./
RUN dotnet restore

# Copy everything else and build
COPY . ./
RUN dotnet publish -o out

# Build runtime image
FROM microsoft/dotnet:aspnetcore-runtime
WORKDIR /app
COPY --from=build-env /app/out .
ENTRYPOINT ["dotnet", "test.dll"]

I have appsettings.Production.json and appsettings.Development.json and I have configured my two environments in program.cs like below:

 public static IWebHostBuilder CreateWebHostBuilder (string[] args) =>
            WebHost.CreateDefaultBuilder (args)

            .ConfigureAppConfiguration ((hostingContext, config) => {
                config.AddJsonFile ("appsettings.Development.json", optional : false, reloadOnChange : false)
                    .AddJsonFile ("appsettings.Production.json", optional : false, reloadOnChange : false);
            })
            //End of update
            .UseStartup<Startup> ();

I build the docker image and container but when it starts it starts in production mode I want it to start in development mode

Upvotes: 18

Views: 23180

Answers (4)

Vladimir Titkov
Vladimir Titkov

Reputation: 303

I had same problem. My Project has 3 appsetings.json inside (one generic and two for development and production like this appsettings.development.json and appsettings.producation.json). I tried these:

  1. Not to mention environment in any docker files as I don't wanna stick to file (and source control respectively) because I should have possibility to run same image in different environments. I starts my container with --env ASPNETCORE_ENVIRONMENT=development or DOTNET_ENVIRONMENT=development with no result.
  2. I added ENV ASPNETCORE_ENVIRONMENT development to my dockerfile and it works. But this make me lose procs from 1st note. So I removed it.
  3. I start my container just with --env Environment=development and it somehow works! Miracle! Actually I still don't know why it works. Is 'Environment' a docker's built-in variable? And how it relate to ASPNETCORE_ENVIRONMENT? Or is ASPNETCORE_ENVIRONMENT (and DOTNET_ENVIRONMENT) variable dig to ENVIRONMENT variable eventually?

Upvotes: 3

wast
wast

Reputation: 986

ENTRYPOINT ["dotnet", "test.dll", "--environment=Development"]

Upvotes: 18

mili spring
mili spring

Reputation: 531

If you don't specify the environ while running the container, it will take “Production” by default.

To run another environ:

docker run -d -p 8000:80 –name something –env ASPNETCORE_ENVIRONMENT=Development myimage

Upvotes: 2

Mostafa Hussein
Mostafa Hussein

Reputation: 11940

ASP.NET Core reads the following environment variable ASPNETCORE_ENVIRONMENT if not set then it defaults to production. What you need to do is to use this in your Dockerfile

ENV ASPNETCORE_ENVIRONMENT Development

Or if you are using docker-compose.yml file

environment:
  ASPNETCORE_ENVIRONMENT: Development

For more details:

Upvotes: 12

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