Oh there is no docker involved; that is the host itself.

FriendlyElec NanoPi R6s

running: OpenWrt 23.05.2

Mounting:

- an internal microSD card I use for aux storage

- a microSDXC with 1TB through a maxed out USB 3.1 port on the front, which is also it's fastest storage, and where I keep my blockchain stuff.

Then, on the latter microSD, I used alpine's create-chroot script and modified it a little to produce a nice chroot I can now just get into, whenever I want.

To start services, I use dinit with my own service files, running inside the chroot - but being started/stopped itself by the host through procd/ubus.

So the whole thing is a makeshift VM. ^.^