How to deploy rails application to amazon EC2

I am new to amazon servcies, currently, i have an rails application and ready to deploy to amazon ec2, and connect to amazon rds.

But I am not sure which way is the most straightforward to deploy application to amazon ec2 and connect to rds.

I did some research on amazon documentation, seems there are several ways to do that:

1. CodeDeploy
2. ElasticBeansTalk
3. OpsWork

Moreover, rubber seems another way to deploy rails application. But those methods made me confused, which one is the most simplest one.

Could someone guide me how to deploy rails application to amazon ec2 and connect to rds database service?

Thanks!!!