They're great for tinkering with distributed systems. I.e. if you want to play with Kubernetes, you can build a master and 2 workers out of RPis for like $90.

They're great for tinkering with distributed systems. I.e. if you want to play with Kubernetes, you can build a master and 2 workers out of RPis for like $90. They won't have enough power to run anything substantial, but it's enough to play around with upgrading the control plane or mess with the network plane. Same thing if you want to play with failure scenarios on distributed databases, or whatever. It's doable with VMs, but every time I try to do anything fancy with VM or container networking, I end up spending hours reading documentation because my VMs refuse to communicate at all. I also like it because they force me to use Ansible and actually make my installs repeatable. On my actual server, practically everything is some snowflake crap I did at 3am that I couldn't repeat if I had to.