Redis with Rails

Redis is an open source, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
You can run atomic operations on these types, like appending to a string; incrementing the value in a hash; pushing to a list; computing set intersection, union and difference; or getting the member with highest ranking in a sorted set.

wget http://redis.googlecode.com/files/redis-2.4.5.tar.gz
tar xzf redis-2.4.5.tar.gz
cd redis-2.4.5
make

Once installed, run the server with the below command.

 src/redis-server

Official Site : redis.io
Good Link for ROR with redis : http://jimneath.org/2011/03/24/using-redis-with-ruby-on-rails.html