AWS Cloud9 users: please check the notes below the video before proceeding.
Due to changes with Amazon's acquisition of Cloud9, instead of changing directories (the cd command) into the workspace directory as I do in the video, make sure you change directories into the actual blog directory you created. i.e. You must be in the ~/environment/blog directory to run the rails server command.
cd .. cd workspace rails server -b $IP -p $PORT (Ctrl + C to shutdown Rails server)