I've written before about .net core with docker and using it with .net core 2.1
But as .net core has moved forward through new versions the docker files change, this is a sample docker file for a .net core 2.2 web app.
FROM microsoft/dotnet:2.2-sdk-alpine3.8 AS build WORKDIR /app # copy csproj and restore as distinct layers COPY *.sln . COPY Serversncodenetcore2.2_docker/*.*.csproj ./Serversncodenetcore2.2_docker/ RUN dotnet restore # copy everything else and build app COPY Serversncodenetcore2.2_docker/. ./Serversncodenetcore2.2_docker/ WORKDIR /app/Serversncodenetcore2.2_docker RUN dotnet publish -c Release -o out FROM microsoft/dotnet:2.2.0-aspnetcore-runtime AS runtime WORKDIR /app COPY --from=build /app/Serversncodenetcore2.2_docker/out ./ ENTRYPOINT ["dotnet", "Serversncodenetcore2.2_docker.dll"]
The big difference from 2.1 is the images we use. In this case I am using the 2.2-sdk-alpine3.8 as my build image.
For the runtime I use the 2.2.0-aspnetcore-runtime