How to create & run .net Core Console App in docker

Question

I have a .NET Core 2.1 console app. I want to run this console app in a Docker image. I'm new to Docker and just trying to figure it out.

At this time, I have a Dockerfile, which was inspired from Microsoft's Example. My file actually looks like this:

FROM microsoft/dotnet:2.1-runtime-nanoserver-1709 AS base
WORKDIR /app

FROM microsoft/dotnet:2.1-sdk-nanoserver-1709 AS build
WORKDIR /src
COPY MyConsoleApp/MyConsoleApp.csproj MyConsoleApp/
RUN dotnet restore MyConsoleApp/MyConsoleApp.csproj
COPY . .
WORKDIR /src/MyConsoleApp
RUN dotnet build MyConsoleApp.csproj -c Release -o /app

FROM build AS publish
RUN dotnet publish MyConsoleApp.csproj -c Release -o /app

FROM base AS final
WORKDIR /app
COPY --from=publish /app .
ENTRYPOINT ["dotnet", "MyConsoleApp.exe"]

My question is, what is the difference between: microsoft/dotnet:2.1-runtime-nanoserver-1709, microsoft/dotnet:2.1-sdk, and microsoft/dotnet:2.1-runtime? Which one should I use for my .NET 2.1 console app? I'm confused as to if I a) build my console app then deploy it to a docker image or b) build a docker image, get the code, and build the console app on the image itself. Any help is appreciated.

Mugen · Accepted Answer · 2019-07-31 15:20:43Z

14

For anyone interested in actual Dockerfile reference:

FROM microsoft/dotnet:2.2-sdk AS build
WORKDIR /app

COPY <your app>.csproj .
RUN dotnet restore <your app>.csproj

COPY . .
RUN dotnet publish -c Release -o out

FROM microsoft/dotnet:2.2-aspnetcore-runtime AS runtime
WORKDIR /app
COPY --from=build /app/out ./

ENTRYPOINT ["dotnet", "<your app>.dll"]

answered Jul 31, 2019 at 15:20

Mugen

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4 Comments

Mugen Over a year ago

note to use the correct .NET core version in the base images (2.1, 2.2 etc)

granadaCoder Over a year ago

so does ENTRYPOINT .. "find" the static main method (inside Program.cs)..........inside "<your app>.dll" ? Is that the magic?

Mugen Over a year ago

yes, same as when you just run the dll from debugger or command line

Odilbek Utamuratov Over a year ago

First, it did not work. I had just replaced /app with /source on the second line. Then it worked

bxN5 · Accepted Answer · 2018-08-09 14:36:47Z

2

It's a question more not about docker itself, but .net docker images

You can go to the https://hub.docker.com/r/microsoft/dotnet/ click in particular image find Dockerfile and understand what exactly software builds in this image and find the difference between different Dockerfile's

Regarding second question better to "build a docker image, get the code, and build the console app on the image itself." So you build the image, expose port, mount your code as volume, and your code executes inside the container with help of software installed in the container

answered Aug 9, 2018 at 14:36

bxN5

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Comments

Odilbek Utamuratov · Accepted Answer · 2023-11-23 09:32:13Z

1

For .NET 7 the following code works

FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
WORKDIR /source

COPY . .
RUN dotnet restore <your app name>.csproj --disable-parallel
RUN dotnet publish <your app name>.csproj -c Release -o /app --no-restore

FROM mcr.microsoft.com/dotnet/aspnet:7.0
WORKDIR /app
COPY --from=build /app ./

ENTRYPOINT ["dotnet", "<your app name>.dll"]

edited Nov 23, 2023 at 9:32

answered Nov 23, 2023 at 9:17

Odilbek Utamuratov

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Comments

Rumit Patel · Accepted Answer · 2019-01-09 10:56:40Z

0

microsoft/dotnet:2.1-runtime-nanoserver-1709 - This image is used to setup .net runtime, under which any .net app runs.

microsoft/dotnet:2.1-sdk-nanoserver-1709 - This image is of SDK used to compile your .net core app

Refer this blog for how to create & run .net core console app in docker:

edited Jan 9, 2019 at 10:56

Rumit Patel

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answered Jan 9, 2019 at 10:16

Sagar

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Comments

zhimin · Accepted Answer · 2019-01-09 11:13:29Z

0

My answer for the first question is:

microsoft/dotnet:2.1-runtime-nanoserver-1709 is a docker image you can run .net core apps,

And microsoft/dotnet:2.1-sdk-nanoserver-1709 is a docker image you build apps , you can also run app with it.

And my answer for the second question is:

If you just want to run app in docker, build your app with visual studio on you local machine (this will be the most easy way to build it), use the microsoft/dotnet:2.1-runtime-nanoserver-1709 , build a docker image.

answered Jan 9, 2019 at 11:13

zhimin

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Nimantha · Accepted Answer · 2021-12-06 03:08:43Z

0

I put an example on Github on how to do this for a .net core webapi application, so should be pretty much the same for a console application.

My docker file looks like:

https://github.com/MikeyFriedChicken/MikeyFriedChicken.DockerWebAPI.Example

This is doing pretty much the same as yours.

Just to clarify previous answers what your dockerfile is doing is creating 'temporary' images which have the ability to build your software. Once it is all built these images just get scrapped.

If you look at your last lines in your dockerfile you can see it copies the output from the build images to your final image which is based on 'microsoft/dotnet:2.1-runtime-nanoserver-1709' which has just enough libraries and dependencies for running your .net core application.

edited Dec 6, 2021 at 3:08

Nimantha

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answered Jan 9, 2019 at 13:11

Michael Ceber

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