There is a feature request out there for what you are wanting to do. As is, we don't have a built in method but I'll leave this link here for anyone landing here.
Migrating this feature request from GitHub :
I'd love to see the option of running multiple PiHoles in your network and a means to keep all of them in sync (whitelists, etc). Ideally, only one would serve the Web Interface, and it would show stats for multiple PiHoles. (the other PiHoles could be "satellite" PiHoles or something)
The use case is the following: I have PiHole running flawlessly in an Ubuntu Server 16.04 VM in Hyper-V. But this is a single point of failure - when I reboot my Hy…