By pure, I just meant no dependencies on c or c++ bindings other than libc. If that is the case you can do a musl build that has no dynamic dependencies, as all rust dependencies are static. So then your only dependency is the kernel, which is provided via podman/docker. A decent sized rust program with hundreds of dependencies I can get to compile down to 1.5MB. But that is depending on gnu. So if you had 4 or 5 of those on a node, it might be less data to use one gnu base image that is really small like rhel micro, and build rust for gnu. But if you have cpu hungry services like I do, then you usually have only a couple per node, so from scratch musl can be a bit smaller.