Installation commands:
$ wget http://redis.googlecode.com/files/redis-2.4.8.tar.gz
$ tar xvfz redis-2.4.8.tar.gz
$ cd redis-2.4.8/
$ mkdir -p /opt/redis
$ make PREFIX=/opt/redis install
$ cp redis.conf /opt/redis/redis.conf
$ chown -R redis:redis /opt/redis