node js building docker

 FROM                  node:alpine       => Specify base image

 WORKDIR             /app                => Set the working directory to '/app' in the                                                                  container. All following commands will be 

                                                      issued relative to this dir

 COPY                   package.json ./   => Copy over only the package.json file

 RUN                    npm install        => Install all dependencies

 COPY                   ./ ./                 => Copy over all of our remaining source code

 CMD                    ["npm", "start"]  => Set the command to run when the container

                                                      starts up

Dockerfile

FROM node:alpine

WORKDIR /app

COPY package.json ./

RUN npm install

COPY ./ ./

CMD ["npm", "start"]

.dockerignore

node_modules

docker build .

Successfully built eb521ea6b7e6

docker run eb521ea6b7e6

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docker build -t abcdefg/efgh .            => Build an image based on the dockerfile in the 

                                                        current directory. Tag it as 'abcdefg/efgh'

docker run [image id or image tag]     => Create and start a container based on the

                                                        provided image id or tag

docker run -it [image id or image tag] [cmd] => Create and start container, but also

                                                                override the default command

docker ps                                    => Print out information about all of the 

                                                      running containers

docker exec -it [container id] [cmd]    => Execute the given command in a running 

                                                      container

docker logs [container id]                => Print out logs from the given container