For Linux - I think this will do: keep /tmp off tmpfs, don't mention it in the configs of tmpfiles.d I might be missing something but these are the key suspect

For Linux - I think this will do: keep /tmp off tmpfs, don't mention it in the configs of tmpfiles.d I might be missing something but these are the key suspects (I generally prefer this to be wiped, using tmpfs) Not sure about anything else *nix