Keepalived

Overview # DNS is the backbone of your network. When your Pi-hole goes down, every device in your home loses internet access. Websites won’t load. Apps stop working. Smart home devices go offline. It’s a single point of failure that brings everything to a halt. This tutorial shows you how to build a resilient DNS infrastructure using two Pi-hole servers with automatic failover. If one server dies, the other seamlessly takes over in under 15 seconds — without any manual intervention.