Raspberry Pi Network Boot Approach

README.md

How I tried it:

Build Docker Images

sudo docker build -f Dockerfile.dnsmasq -t local/dnsmasq .

sudo docker build -f Dockerfile.nfs -t local/nfs-server .

Edited the setup.sh from here

1. Updated the URL to: url="http://downloads.raspberrypi.org/raspios_lite_armhf/archive/2022-01-28-13:51/"

dnsmasq.conf

port=0
dhcp-range=10.50.0.1,10.50.3.254
log-dhcp
enable-tftp
tftp-root=/tftpboot
pxe-service=0,"Raspberry Pi Boot"

docker-compose.yml

version: "2"

services:
  netboot_boot:
    image: local/dnsmasq
    privileged: true
    container_name: dnsmasq
    network_mode: "host"
    volumes:
      - ./os/boot:/tftpboot
      - ./dnsmasq.conf:/etc/dnsmasq.conf

  netboot_root:
    image: local/nfs-server
    container_name: nfs-server
    privileged: true
    network_mode: "host"
    volumes:
#      - ./exports:/etc/exports
      - ./os:/nfsshare

Dockerfile.dnsmasq

FROM alpine

RUN apk add --no-cache dnsmasq

EXPOSE 53/tcp \
       53/udp \
       67/udp

ENTRYPOINT ["dnsmasq", "--no-daemon", "--user=dnsmasq", "--group=dnsmasq"]

Dockerfile.nfs

FROM alpine

RUN apk --update --no-cache add bash nfs-utils \
  && echo "/nfs/client1 *(rw,sync,no_subtree_check,no_root_squash)" | tee -a /etc/exports
COPY run_nfs /usr/bin/
COPY exports /etc/exports

#VOLUME /nfs/client1

ENTRYPOINT ["run_nfs"]

exports

/nfsshare *(rw,sync,no_subtree_check,no_root_squash)

run_nfs

#!/bin/bash

set -xe

trap "stop; exit 0;" SIGTERM SIGINT

stop()
{
  # We're here because we've seen SIGTERM, likely via a Docker stop command or similar
  # Let's shutdown cleanly
  echo "SIGTERM caught, terminating NFS process(es)..."
  /usr/sbin/exportfs -ua
  pid1=$(pidof rpc.nfsd)
  pid2=$(pidof rpc.mountd)
  kill -TERM $pid1 $pid2 > /dev/null 2>&1
  echo "Terminated."
  exit
}

mkdir -p /nfsshare

# Fixed nlockmgr port
#echo 'fs.nfs.nlm_tcpport=32768' >> /etc/sysctl.conf
#echo 'fs.nfs.nlm_udpport=32768' >> /etc/sysctl.conf
#sysctl -p > /dev/null

mount -t nfsd nfds /proc/fs/nfsd

rpcbind -w
rpc.nfsd -N 2 -V 3 -N 4 -N 4.1 8
exportfs -arfv

rpc.statd
rpc.mountd -N 2 -V 3 -N 4 -N 4.1 -F

setup.sh

#!/bin/sh

set -xe

die() {
	printf '\033[1;31mERROR:\033[0m %s\n' "$@" >&2  # bold red
	exit 1
}

which xz > /dev/null || die 'please install xz'
which docker > /dev/null || die 'please install docker'
which docker-compose > /dev/null || die 'please install docker-compose with: sudo pip3 install docker-compose'

cd "$(dirname "$0")"

DEST=$(pwd)

url="http://downloads.raspberrypi.org/raspios_lite_armhf/archive/2022-01-28-13:51/"
server_ip=$(ip route get 1 | awk '{print $NF;exit}')

mkdir -p os/boot os/root

wget $url/boot.tar.xz -O- | tar -C os/boot -xJf -
wget $url/root.tar.xz -O- | sudo tar -C os/root -xJf -

echo "dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/nfs \
	nfsroot=$server_ip:/nfsshare/root,vers=3 rw ip=dhcp rootwait elevator=deadline" | \
	sudo tee os/boot/cmdline.txt

echo "proc                           /proc           proc    defaults          0       0
"$server_ip":/nfsshare/boot   /boot           nfs     defaults          0       0" | sudo tee os/root/etc/fstab

sudo rm -f os/root/etc/init.d/resize2fs_once