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Install PackStack in two nodes (Controller and Compute)

I want to install distributed OpenStack using PackStack. PackStack by default needs 3 nodes, Controller, Network and Compute. I want to merge controller with the network node but I couldn't find any instruction for that. My plan is to create a virtual machine for the Controller and the compute node will be installed on bare metal I tried inserting Controller IP address as Network host in the PackStack answer file, but it was not successful. Should I do anything else for that?

In addition, I want to know is it necessary to have two NIC in the Controller and Compute machine? and if yes which NIC address should I set for Hosts in the PackStack answer file? Is it Ok to the both NIC in machine bind to the same IP range or it should be different?