A UniFi firmware update wipes everything except /data
My container had been dead since the last flash, because the flash took /usr and /var with it. The boot hook that puts it back cannot download anything.
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systemd-nspawn
Technitium DNS in a container on a UDM Pro Max
The UDM runs Debian and systemd, so it can run an nspawn container. What it cannot do is let that container talk to the router it is attached to.