# raspberry pi hosting brainstorming

## Raspberry Pi netbooting

* pi loads something from pxe
* this can be ipxe
* or a kernel
* user data is somewhere
* ceph / rbd
* nfs (security? nfs over tls1.3?)

## Mounting NFS

* Can be done from Linux
* From ipxe?
* https://ipxe.org/gsoc/nfs

## The kernel problem

* ipxe or whatever is loading a kernel
* we need to have a generic way to jump to the right kernel
* What we can do easily
* have a fixed kernel + initramfs
* then load / mount nfs or something else (even ceph rbd)
* Forces all users to run same kernel+initramfs
* Upgrades might break the user
* This might work for testing
* We might be able to kexec!

## OS image approach

* From SD card
* pxe boots a kernel
* kernel loads initramfs
* but initramfs cannot be modified
* user cannot update kernel

## What we would like to have

* raspberry pi boots without anything in it -> netboot
* it loads an image with a bootloader or similar
* something abstract that does efi or bios load whatever...
* optimal case
* Approaches
* ipxe
* can load kernel/initramfs
* cannot load something from ceph

## NFSroot based approach

* http://alexforencich.com/wiki/en/linux/diskless_pxe_nfs

## Interesting facts

* Changing the PI and keeping your state/ip address/OS

## References

* https://ipxe.org/

* https://www.raspberrypi.org/documentation/hardware/raspberrypi/bootmodes/net_tutorial.md
* https://www.raspberrypi.org/documentation/hardware/raspberrypi/bootmodes/net.md
* https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md