For Redis 2.6 Installation as a Service on Amazon Linux and CentOS:
Note: Please make sure you have superuser privileges

1. wget https://raw.github.com/saxenap/install-redis-amazon-linux-centos/master/redis-install-script.sh
2. chmod 777 redis-install-script.sh
3. ./redis-install-script.sh

For Redis Server init Script:

1. wget https://raw.github.com/saxenap/install-redis-amazon-linux-centos/master/redis-server

References:
http://www.codingsteps.com/install-redis-2-6-on-amazon-ec2-linux-ami-or-centos/
https://raw.github.com/gist/257849/9f1e627e0b7dbe68882fa2b7bdb1b2b263522004/redis-server
https://raw.github.com/gist/2776679/c131c0548e7cd2ece85edfb8bea70575586147c7/install-redis.sh