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As far as I know multi-tenancy normally handled at application level either using single database or multiple databases.

But From your explanation what I am getting feel is you want to provisioning of single application on multiple servers for multiple clients each having a separate application and database instances.

I am not sure of any open source framework available but I am sure this is possible on AWS with automation scripts in shell.

If you found any such framework then please let me know

Thanks

Microsoft has an excellent writeup on how one could approach multi-tenant architecture.

Helped me a lot when I did a project with multiple tenants.

Link: https://msdn.microsoft.com/en-us/library/aa479086.aspx

Terraform from HashiCorp combined with Puppet, Chef, Ansible whatever you prefer

Multi-tenant cloud Setup