Dockerfile

FROM node:12-alpine * to be based on which other Docker image?

RUN apk add --no-cache python g++ make * install additional software

WORKDIR /app * create and use directory /app inside the container

COPY . . * 1st parameter: local directory (./ is the directory where the Dockerfile is) * 2nd parameter: target directory inside the container * → copy everything where the Dockerfile is in, into the container under /app

RUN npm install * dependencies for the application

CMD ["node", "src/index.js"] * run the app - just like when running outside a container