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
useradd -rMU -d /opt/redis -s /bin/false -c redis redis