I want to run nano server on old hardware, but I cannot seem to find the right system requirements?

Also, where do I find the image?

thank you, I am really looking forward to Dockerizing!

System requirements are not ready yet. To try out Nano Server, download the Windows Server Technical Preview 2 ISO from here: 

https://www.microsoft.com/en-us/evalcenter/evaluate-windows-server-technical-preview?i=1

There is a Nano Server folder in the image and the deployment guide will get you started. To learn more about Nano Server, visit this blog:

http://blogs.technet.com/b/nanoserver/archive/2015/05/12/welcome-to-the-new-nano-server-blog.as