Any suggested render farm for connecting machines in a local network?

Hello all, I have some machines that can be connected in a local network but not internet, so may I know if there is any good render farm for blender 2.80 to connect them since network renderer add-on no longer exists. Because no internet is connected, the blender cloud server could not be used. So if any one has built the blender cloud server together with flamenco successfully, could you share some experience with me, please? Much appreciated!

I’m using http://cgru.info/home since a long time, it’s easy to setup and quite efficient.
You can look here on how to setup your network to use it : http://ramellij.blogspot.com/2015/06/how-to-build-open-source-renderfarm.html

The interface seems a bit complicated but in fact it’s simple and easy to understand once you get used to it.