Systemd invocation parameters

Question

This is a request for official documentation. As I understand it, kernel command line parameters, e.g.:

root=/dev/sda1 foo=bar

That are not recognized by the kernel itself are passed on to init, on linux now most commonly systemd.

While the kernel's own parameters are largely documented, I can't find any for systemd itself. man systemd does refer to a handful of things but it does not seem to cover this, and searching online has led me nowhere.

Answer 1

As @Bigon notes, the official documentation you are looking for is in man kernel-command-line.