Running Two Pi Holes in Tandem
When walking and listening to the 2.5 Admins I heard about the concept of going from treating servers as pets to treating them as cattle. They discussed the habit of giving servers functional names, rather than emotional ones. The examples were similar to DR-1 for for Disaster Recovery one, prod 1 for production one and related names.
Servers as Cattle, Not Pets
They spoke about the legacy habit of building a server up over a period of years to the modern habit of spinning up instances and containers that can easily be replicated within minutes, independent of hardware. They spoke about the need to take notes and set up an environment once, and then destroy it, and set it up again, and to follow the notes exactly. The concept is that you don’t set something up just once, you set it up over and over, and over again, until you have the work flow perfected, and written down, for repeatability, three years down the line.