Convox Rack is a private PaaS that runs in your AWS account.
Install a Rack from Convox Console
$ convox apps create myapp
Creating app myapp... OK
$ convox env set SECRET=foo -a myapp
Setting SECRET... OK, RABCDEFGH
$ convox deploy ~/src/myapp -a myapp
Building myapp... OK
Creating release RHGFEFCBA... OK
Promoting release RHGFEFCBA... OKApache 2.0