How I turned two of the four Pis into a redundant DNS pair — Pi-hole blocking ads, Unbound recursing directly to root servers, zero ISP resolver seeing my queries. Plus the rolling upgrade playbook that gates each Pi behind a dig health check so the house never loses DNS.
$ grep -l "#RaspberryPi" /blog/*.mdx // 2 matches
#RaspberryPi
Three years ago I bought Raspberry Pis 'to learn Kubernetes' and never opened the boxes. This is what I did with them once I finally admitted that wasn't happening — and the repeatable baseline that means I never have to think about Pi setup again.