What is Redis?
Redis is an open source, advanced in-memory key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
######1. If you're running OS X, install redis in terminal using Homebrew :
brew install redis
######2. Add the redis and hiredis gems to the project's Gemfile (remember to bundle install
after you do this) :