Based on docs from https://github.com/dotnet/dotnet-docker-samples

Three workflow:

1. use sdk docker image, build and run inside container
2. use sdk docker image to build, and use runtime image to run it
3. self contained, with any image based on os (supported by .net core).

console app

Use workflow 2, build with sdk and run with runtime image

This is supported by multi staged docker build

In a sample4 directory.

first, let’s create a console app, run:

dotnet new console -lang f#

Now create a Dockerfile:

FROM microsoft/dotnet:2-sdk AS build-env
WORKDIR /app

# copy fsproj and restore as distinct layers
COPY *.fsproj ./
RUN dotnet restore

# copy everything else and build
COPY . ./
RUN dotnet publish -c Release -o out

# build runtime image
FROM microsoft/dotnet:2-runtime 
WORKDIR /app
COPY --from=build-env /app/out ./
ENTRYPOINT ["dotnet", "sample4.dll"]

The COPY will copy all files, so let’s exclude temp dir who can exists locally

Add a .dockerignore file with

bin/
obj/
out/

and build it

docker build -t sample4 .

and run it

docker run --rm sample4 "from inside docker"

web app

Let’s use suave, with workflow 3

In a sample4 directory.

first, let’s create a console app

dotnet new console -lang f#

And add Suave

dotnet add package Suave

Now add suave code in main

with open Suave and

    startWebServer
        { defaultConfig with
            bindings = [ HttpBinding.create HTTP System.Net.IPAddress.Any 8083us ] }
        (Successful.OK "Hello World!")

we can try locally with dotnet run, who will create a server listening to 0.0.0.0:8083 and that’s exposed to host at http://127.0.0.1:8083

Now the Dockerfile

FROM microsoft/dotnet:2-sdk AS build-env
WORKDIR /app

# copy fsproj and restore as distinct layers
# COPY nuget.config ./
COPY *.fsproj ./
RUN dotnet restore

# copy everything else and build
COPY . ./
RUN dotnet publish -c Release -r linux-x64 -o out

# build runtime image
FROM microsoft/dotnet:2-runtime-deps
WORKDIR /app
COPY --from=build-env /app/out ./
ENTRYPOINT ["./sample5"]

And the .dockerignore

bin/
obj/
out/

Now build

docker build -t sample5 .

and run

docker run --rm -p 8083:8083 sample5