Docker Mirror your host folder with the guest

To mount a volume that mirrors your files in your host

docker run -p 8080:3000 -v $(pwd):/var/www -w "/var/www" node npm start

• 8080:3000 your app runs in port 3000 and you want it to be served in 8080 in the host, this will forward the port.
• -v $(pwd):/var/www, mounts the current directory /var/www
• -w "/var/www" sets the working directory inside the container to /var/www, so when when we execute our command it’ll execute their
• node name of the image
• npm start our command to be executed in the working directory

So it starts the node container, exposes 8080 and forward 3000 to it. Mount a volume to mirror our local files, sets the working directory where the command will be executed. Finally, execute the command.