Add the Redis cartridge to your app
rhc add-cartridge http://cartreflect-claytondev.rhcloud.com/reflect\?github\=smarterclayton/openshift-redis-cart -a <app_name>
Get Redis env variables
When you SSH into your gear, you can see Redis env variables such as host, port, username and password that you can use in your applications:
rhc ssh <app_name>
env | grep -i redis | sort