Hands-On RESTful Web Services with ASP.NET Core 3

Defining the Dockerfile

Let's proceed by describing the Dockerfile of our compose project. As mentioned previously, the Dockerfile is a simple text file that contains the commands a user could call to assemble an image. Let's examine a possible definition of the Dockerfile contained in the containers/api/ folder:

FROM mcr.microsoft.com/dotnet/core/sdk:3.1.100COPY . /appWORKDIR /appRUN dotnet restoreRUN dotnet buildRUN dotnet tool install --global dotnet-efENV PATH="${PATH}:/root/.dotnet/tools"RUN chmod +x containers/api/entrypoint.shCMD /bin/bash containers/api/entrypoint.sh

This code defines specific steps to build the Docker image. The FROM directive refers to the base image to use during the build process. This directive is mandatory, ...