os/butane/k8s-leader-install.yaml

variant: flatcar
version: 1.0.0
systemd:
  units:
    - name: installer.service
      enabled: true
      contents: |
        [Unit]
        Requires=network-online.target
        After=network-online.target
        [Service]
        Type=forking
        TimeoutStartSec=600
        RemainAfterExit=yes
        ExecStart=/usr/bin/sh -c "flatcar-install -d /dev/vda -i /opt/ignition.json && udevadm settle && systemctl reboot"
        [Install]
        WantedBy=multi-user.target
storage:
  disks:
    - device: /dev/vda
      wipe_table: true
      partitions:
      - label: ROOT
  filesystems:
    - path: /
      device: /dev/disk/by-partlabel/ROOT
      format: btrfs
      wipe_filesystem: true
      label: ROOT
  files:
    - path: /opt/ignition.json
      mode: 0700
      contents:
        source: http://192.168.40.3/leader.json