How to sync settings for two Pi-Holes on network?

[realtebo]

I'd like to add a second pi-hole in my network, to allow load balancing or, at least, a failover if the mainn pihole should go down.

Is there a documented / raccomended way to share or keep synced settings beetween two pi-holes?
I kow that external lists will be updated automatically, no problem.

But How to allow sync of black and white list? and of audited of course?

[jfb]

@realtebo

I’d like to add a second pi-hole in my network, to allow load balancing or, at least, a failover

Depending on your router and clients, you might find that the loads won't be balanced. Since a normal Pi-Hole setup can easily handle a home network, this shouldn't be a problem, but you may not get the balance feature with two Pi-Holes in parallel.

Example - I use an Apple router for DHCP, two Pi-Holes in parallel. Pi-1 is listed first in DNS, Pi-2 is listed second. Pi-1 routinely gets 99% of the traffic, and only a few IOT devices leak over to Pi-2. When I fiddle with Pi-1 for updates or the like, traffic moves seamlessly to Pi-1 and then back again.

For syncing white and black lists (I don't use the audit feature), I run teleporter every few weeks. Since Pi-1 gets almost all the traffic, it has bigger white and black lists, so I export from Pi-1 and import at Pi-2.

[realtebo]

Thanks for your reply.

I will create something like a balancing because dns were pushed in a round robin order by openvpn when client connects. But this is not important at all.

I actually planned to rsync in pull mode from a master pihole to every single secondary dns.only white and black lists.

I just opened another trhead for a new question about this.

In this way, I'm near enough to a load balancing.