@Larry Snoddy Below is the current supported and recommended system requirements/environment for On-Premises 2015.2:
VMware® vSphere server (recommended) or VMware® ESX server
Minimum 6GB of allocated memory. 8 to 12 GB of RAM is recommended for improved performance for subscriptions that may serve a higher volume of requests.
2 CPUs
150 GB Disk
While it may be possible to use redhat 7, we have not tested against this nor can we provide support for issues that arise from deploying to redhat 7.