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It looks like systemd-nspawn is gaining rootless support, see https://github.com/systemd/systemd/issues/30239
Until then, I'm not sure if there is anything lightweight. If you don't need lightweight, there is Podman.
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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Surprisingly simple and low footprint solution. Genuinely pleasant to work with.
[1]https://github.com/JanMa/nomad-driver-nspawn
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I discovered a similar project to run Docker containers as user without being root:
https://github.com/mtseet/proot-docker
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Linux user namespaces can be used to create containers without having root access, see ex. https://unix.stackexchange.com/questions/66084/simulate-chro...
There's also https://github.com/termux/proot-distro which may or may not count as containers depending on how you define the word but I think it does count