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Great, sounds quite simple.

One thing I somewhat miss from what you are explaining is all the aditional things that LXD gets you (snapshots using ZFS, image publishing/sharing, migrating containers between LXD hosts...)

But maybe some of those things are still doable (e.g. mounting a ZFS dataset as storage for /var/lib/machines/containerX)...

Thanks for your answer!

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Haven't dealt with live migration, but mounting filesystems should be easy using systemd's unit dependencies.

Just drop a .mount file in /etc/systemd/system and set RequiredBy=systemd-nspawn@something.service and StopWhenUnneeded=true and the filesystem should be mounted before the machine starts and unmounted when the machine is shut down. See the manpages systemd.unit and systemd.mount for details.

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