FROM node:slim # WORKDIR specifies the directory our # application's code will live within WORKDIR /app # We copy our package.json file to our # app directory COPY package.json /app #for websockets EXPOSE 8080/tcp EXPOSE 8080/udp RUN apt-get update \ && apt-get clean \ && apt-get install -y ffmpeg # We then run npm install to install # express for our applicationRUN RUN npm install # We then copy the rest of our application # to the app direcoty COPY . /app # We start our application by calling # npm start. CMD ["npm", "start"]