This is kind of offtopic but what is the attraction of using Heroku over using EC2 directly now. I remember back in the day when EC2 didn't have RDS and Elasticbeanstalk Heroku was an attractive option because you could deploy and scale without needing to do any kind of system administration.

But now EC2 is offering managed databases through RDS and elastic bean stalk gives you git style deployment similar to Heroku I don't see what Heroku is offering other than another point of failure and another set of security problems. It looks like Heroku uses linux containers for isolation. So not only do you have to worry about someone attacking the underlying EC2 VMs Heroku uses but you have to worry about the tenants collocated on your Heroku VM attacking you through the linux kernel as well.