Hi Ben,
Thanks for your reply. 
Actually I'm a little confused by "virtual environment". I guess what it means 
is as below:  - 1 Seed VM as deployment starting point.  - Both undercloud and 
overcloud images are loaded into Glance of Seed VM.  - 15 VMs are created. 1 
for undercloud, 1 for overcloud controller, left 13 are for overcloud compute.  
- 1 Host machine acts as container for all 15 VMs. It can be separated from 
Seed VM.  - Seed VM communicates with Host machine to create 15 VMs and 
installed corresponding images.  Is it correct? Or can you roughly introduces 
the topology of the devtest virtual environment.
Best RegardsLeslie Wang
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