So, unless I'm misunderstanding things due to a migraine, the Kea DHCP server (as packaged by Ubuntu, using their default systemd config): 1. Doesn't attempt to reconnect if it loses its connection to its database (MySQL, Postgres, etc) 2. *Exits* if it loses its database connection. 3. Isn't configured to have systemd restart it if it exits. So, basically, if anything causes Postgres to restart (like `apt upgrade`), I lose DHCP until I restart kea-dhcp4-server manually. Also, static DHCP reservations share the same default lease time as the rest of the devices on the network, and there's no really trivial way to override that. I can't just add `"valid-lifetime": 31500000` or something to each reservation. Instead, it looks like I'd need to use client classes, which is a bit more involved in my config.