Coreos ipxe provision

cloud-config-bootstrap.sh

#!/bin/bash

wget -O cloud-config.yaml http://10.10.20.1/cloud-config.php
coreos-install -d /dev/vda -c cloud-config.yaml
reboot

cloud-config.php

<?php $private_ipv4 = $_SERVER['REMOTE_ADDR'] ?>
#cloud-config
hostname: "<?= md5(microtime(true)) ?>"
coreos:
  update:
    reboot-strategy: best-effort
  units:
    - name: etcd2.service
      command: start
    - name: fleet.service
      command: start
    - name: flanneld.service
      drop-ins:
        - name: 50-network-config.conf
          content: |
            [Service]
            ExecStartPre=/usr/bin/etcdctl set /coreos.com/network/config '{ "Network": "10.1.0.0/16" }'
      command: start
  etcd2:
    # generate a new token for each unique cluster from https://discovery.etcd.io/new?size=3
    # specify the initial size of your cluster with ?size=X
    discovery: https://discovery.etcd.io/...
    advertise-client-urls: http://<?= $private_ipv4 ?>:2379,http://<?= $private_ipv4 ?>:4001
    initial-advertise-peer-urls: http://<?= $private_ipv4 ?>:2380
    listen-client-urls: http://<?= $private_ipv4 ?>:2379,http://<?= $private_ipv4 ?>:4001,http://127.0.0.1:2379,http://127.0.0.1:4001
    listen-peer-urls: http://<?= $private_ipv4 ?>:2380,http://127.0.0.1:2380
  flannel:
    interface: "<?= $private_ipv4 ?>"
ssh_authorized_keys:
  - ssh-rsa AAAAB3NzaC1...

coreos.ipxe

#!ipxe

set base-url http://stable.release.core-os.net/amd64-usr/current
kernel ${base-url}/coreos_production_pxe.vmlinuz rootfstype=btrfs coreos.autologin cloud-config-url=http://10.10.20.1/cloud-config-bootstrap.sh
initrd ${base-url}/coreos_production_pxe_image.cpio.gz
boot

dnsmasq.conf

# Only relevant parts shown
dhcp-range=set:vlan20,10.10.20.10,10.10.20.200,255.255.255.0,30m
enable-tftp
tftp-root=/var/ftpd
tftp-secure
dhcp-boot=net:vlan20,coreos.ipxe