redis_session_storage
#Installation
gem install redis_session_storage
#Usage
Edit config/initializers/session_storage.rb with the following:
Rails.application.config.session_store :redis_session_storage
#Options
Rails.application.config.session_store :redis_session_storage, {options}
:host => the redis host to connect to. Defaults to 127.0.0.1
:port => the redis port, defaults to 6379
:db => redis db to use, defaults to 0
:serializer => Json(:json) or Ruby Marshaller is default
:key => the prefix for the keys in redis and the name of the cookie