What about the layer between CloudFoundry and Amazon EC2 for example? You indicate in your post that this is open? Do you use a cloud abstraction layer similar to deltaCloud for enabling this? Regarding Elastic Load Balancing, it's possible to configure the AWS ELB through its api. But who controls the instances in that case, is it the ELB or still the cloudFoundry cloud controller? Could you explain how it works thx for you answers!