Comment on Adblockers stop publishers serving ads to (or even seeing) 1bn web users - Press Gazette
1984@lemmy.today 2 weeks agoIts actually not easy to run two of them since they are not designed for using a shared disk (you can get corrupted data). Its also not necessary, you can just leave the secondary dns server blank.
But if you want two because you want high availability in case one of your piholes goes down, you can rsync the settings between the two machines every 5 minutes or so. Its important to keep them in sync that way.
mic_check_one_two@lemmy.dbzer0.com 2 weeks ago
The secondary DNS isn’t for redundancy; machines will split requests across the two for load balancing. If you only have one running, you’ll end up with ads slipping through as the device still uses the default secondary DNS.