IIRC, Linux supports up to 32-levels of nesting, so that's an upper bound. This means that within a system container deployed by Sysbox, you can in theory nest

IIRC, Linux supports up to 32-levels of nesting, so that's an upper bound. This means that within a system container deployed by Sysbox, you can in theory nest inner containers up to 31 levels (since one of the 32 levels is used by the system container). In fact you can do docker-in-docker using privileged containers inside the system container. Having said this, while I've tried docker-in-docker inside the system container and it works fine, I've not gone to deeper nesting levels yet. And this is complex stuff, so I won't say that it definitely works until we try it.