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