Custom NixOS image to boot from USB and run from RAM

Help
1

Just wanted to let you know that I’m fairly new to NixOS and just starting out on my journey.

I’m interested in creating a Nix system that boots from USB and runs with all data in RAM so that I can remove the USB stick during run. Maybe even /nix/store could also live in RAM, possibly as a unionfs of a squashfs base and a writable top filesystem.

I’ve heard about the copytoram boot parameter and also found some helpful information on how to customize an image for booting from a USB flash drive. Can anyone provide further guidance or advice on how to achieve this? Thanks in advance!

2

The most important question for me would be:

How can I define the boot parameters like copytoram when creating a USB bootable NixOS?

Then I could experiment more with the created image.

3 
{
  boot.kernelParams = [ "copytoram" ];
}
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