How to boot a physical server from a virtual container over the network?

Question

FreeBSD

Actually, there is a cluster of virtual machines based on proxmox and several physical servers with a minimum system size, but a heavy load on the network and processor (software routers, firewalls, braces). The task on the physical servers is to make the download by pxe and use the KVM container in rw mode as the system. The network boot server is up and running, there are no problems here, but I can’t figure out how to make the server consider the network virtual as its root system. The task is complicated by the fact that you need to load FreeBSD. Of the options, I consider starting a virtual machine, fumbling its root on nfs in the future, the task comes down to mounting the root on nfs, but is it possible to do this or in which direction to dig. I don’t want to compile mfsBSD for each router, and it’s problematic to update or change the configuration later, I want to get all the delights of virtualization such as archiving, replication, etc. on physical servers.

Answer 1

www.freebsd.org/doc/handbook/network-pxe-nfs.html
Is it?

Answer 2

Not really. According to this manual, I will have to raise FreeBSD on a virtual machine and in it already make a subdirectory like a chroot, from where to give images via NFS, like a virtual machine in a virtual machine, I know this option, but I wanted to do without an overhead. While I'm looking at possible options, I'll look for this and RAW via ISCSI for another weekend, and on Monday I'll decide what to choose.