by Ciro Santilli (@cirosantilli, 32)
Video 1. Unpacking 200 servers by Play with Junk (2021) Source.
Video 2. Visiting Hetzner in Falkenstein by der8auer (2022) Source.
As per stackoverflow.com/a/52351480/895245 our standard test setup is: 
while true; do
  resp=$"$(date): hello\n"
  len="$(printf '%s' "$resp" | wc -c)"
  printf "HTTP/1.1 200 OK\r\nContent-Length: $len\r\n\r\n${resp}\n" | nc -Nl 8000
done
It runs one instance of the Linux kernel and has one IP address. Each node is therefore a complete computer. As such is must also contain RAM memory, disk storage and a network interface controller.
  • there can be more than one node per server.
  • there can be more than one CPU per node
E.g.:
Figure 1. Source. Good image from Wikimedia Commons. In this one we can see how the blades are put vertically, and you get several of them per horizontal rack space, instead of a tipical single rack server going all the way horizontally.
Video 1. HP Blade Server by Brian Kirsch (2013) Source.
In the video we can see that it contains RAM, disk storage, we are told about two CPUs, and networking interfaces, so it is a complete computer on its own. He also explains that unlike typical rack servers, each blade unit does not have its own coolers and power supply related hardware, which goes instead on the chassis.
Server run on the current machine. That's how all websites are developed and born!

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