make a docker image for nodejs project

Dockerfile-nodejs

FROM node:latest                    #FROM to tell which base os to use                
ENV NODE_ENV=production              # make it productive 

WORKDIR /app                          # telling Working directory where where the command should this is now the root directory

COPY ["package.json", "package-lock.json*", "./"]         #copyied this file
 
RUN npm install -g create-react-app                       #npm dependencies

RUN npm install                                            #update

COPY project/ .                                            #many file so put in folder then copied insider to root i.e /app

EXPOSE 3000                                                #exposed the 3000 port 
 
CMD [ "npm", "start" ]                                         #started the server