Amazon EC2 Automated Deploy Idea

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You can add or scale out your virtual machine easily on Amazon EC2.
This characteristic is a  big burden for designing a automated and flexible deploy workflow or deploy module.

Then, revise the Amazon web services.
You can access Amazon web services by some 3rd party library.
And get the instance list (= server list), collect destination IP address for coping your web application.

I suggest, every web application on your system has the security group for its own.

Everytime, whether your machine added or not, whether your system scaled ouy automatically, you can get the exact server list at deploy time.