NanoBSD NanoBSD does this. It's a version of FreeBSD with an immutable (read-only) base. I've always been surprised OpenBSD hasn't created similar capabilitie

NanoBSD NanoBSD does this. It's a version of FreeBSD with an immutable (read-only) base. I've always been surprised OpenBSD hasn't created similar capabilities, given that the use case for an immutable base is great for routers / firewalls - and OpenBSD is commonly used for that. https://docs.freebsd.org/en/articles/nanobsd/ https://docs.freebsd.org/en/articles/nanobsd/