If you are using a typical distro like fedora, debian or ubuntu, and you are wiping everything, you don’t really need to know anything. The installer will handle everything for you. Just delete all partitions while installing and start fresh and it should all just work.
If your install media refuses to boot for whatever reason, then you may have to disable secure boot in the system EFI/BIOS menu.
Of the things people complain about that systemd brings in, this is among the least offensive. It makes sense for an init system to provide such functionality, the function of spawning new system processes.
Additionally, in modern systems it doesn’t make sense to use such features. Spawning a new process per request or on demand doesn’t gain you much and does reduce performance.
Spawning new processes on most OS is pretty slow compared to other operations. Additionally, there would also be an increase in latency as the new process needs to be loaded, whereas most software these days can handle the new request in more efficient ways.
I think you can also try to reuse the same process for multiple requests, stopping it only once it has been quiet for a while. But this still doesn’t really help much.
Historically, i think it was used to try to save memory. But today its a bigger nusance than it is worth. I just checked how much memory sshd is using, and i think it is less than 10mb.
total kB 8508 6432 1160
And to be clear, you theoretically can’t save much if any memory doing this because you must have enough memory available to be able to run the process, otherwise bad things will happen or some other process gets oomed.
Additionally, spawning a new process per request can represent an availability violation. An attacker could launch a series of very slow connections to a server spawning a new process per request, causing a depletion of resources.
With all that said, I wouldn’t say there are no uses at all for this, it can be useful to make very minimal network connected software that does some very basic stuff in a secure network.