RancherOS iPXE boot script and cloud-config. Ramdisk based deployment with persistent storage on disk. Configures private IP on eth1 from EC2 metadata.

cloud-config.yaml

#cloud-config
hostname: rancher-os
ssh_authorized_keys:
  - ssh-rsa REPLACE_WITH_PUBLIC_SSH_KEY
rancher:
  debug: false
  cloud_init:
    datasources:
      - ec2
  state:
   formatzero: true
   fstype: auto
   dev: LABEL=RANCHER_STATE
   autoformat:
     - /dev/vda
     - /dev/sda
  network:
    dns:
      nameservers:
        - 8.8.8.8
        - 8.8.4.4
    interfaces:
      eth0:
        dhcp: true
      eth1:
        address: $private_ipv4/16
        mtu: 1450

rancheros-ipxe-boot-script

#!ipxe
# Boots RangerOS in Ramdisk with persistent storage on disk /dev/vda
 
# Location of Kernel/Initrd images
set base-url http://releases.rancher.com/os/latest
 
kernel ${base-url}/vmlinuz rancher.state.dev=LABEL=RANCHER_STATE rancher.state.formatzero=true rancher.state.autoformat=[/dev/sda,/dev/vda] rancher.cloud_init.datasources=[ec2]
initrd ${base-url}/initrd
boot

I'd suggest console=tty1 rancher.autologin=tty1 so that the VNC console from the web panel logs in without asking for a none existing password. In case of trouble... 😄