https://github.com/cybozu-go/placemat/pull/7

cluster.yml

kind: Node
name: my-node
spec:
  interfaces:
    - my-net
  volumes:
    - name: ubuntu
      source: https://cloud-images.ubuntu.com/releases/16.04/release/ubuntu-16.04-server-cloudimg-amd64-disk1.img
      recreatePolicy: IfNotPresent
    - name: seed
      cloud-config:
        user-data: seed.yml
        network-config: network.yml
      recreatePolicy: Always
    - name: data
      size: 10G
      recreatePolicy: Always
  resources:
    cpu: 2
    memory: 4G
---
kind: Network
name: my-net
spec:
  addresses:
    - 172.16.0.11/22

network.yml

version: 2
ethernets:
  ens3:
    addresses:
      - 172.16.0.12/22
    gateway4: 172.16.0.11

seed.yml

#cloud-config
users:
  - name: cybozu
    sudo: ALL=(ALL) NOPASSWD:ALL
    primary-group: cybozu
    groups: users, admin
    lock_passwd: false
    passwd: $6$rounds=4096$m3AVOWeB$EPystoHozf.eJNCm4tWyRHpJzgTDymYuGOONWxRN8uk4amLvxwB4Pc7.tEkZdeXewoVEBEX5ujUon9wSpEf1N.

write_files:
  - path: /etc/ssh/sshd_config
    content: |
      Port 22
      Protocol 2
      HostKey /etc/ssh/ssh_host_rsa_key
      HostKey /etc/ssh/ssh_host_dsa_key
      HostKey /etc/ssh/ssh_host_ecdsa_key
      HostKey /etc/ssh/ssh_host_ed25519_key
      UsePrivilegeSeparation yes

      KeyRegenerationInterval 3600
      ServerKeyBits 1024

      SyslogFacility AUTH
      LogLevel INFO

      LoginGraceTime 120
      PermitRootLogin prohibit-password
      StrictModes yes

      RSAAuthentication yes
      PubkeyAuthentication yes

      IgnoreRhosts yes
      RhostsRSAAuthentication no
      HostbasedAuthentication no

      PermitEmptyPasswords no
      ChallengeResponseAuthentication yes
      PasswordAuthentication yes
      UsePAM yes

      X11Forwarding yes
      X11DisplayOffset 10
      PrintMotd no
      PrintLastLog yes
      TCPKeepAlive yes

      AcceptEnv LANG LC_*

      Subsystem sftp /usr/lib/openssh/sftp-server

kind: Node
name: bootserver
spec:
  interfaces:
    - my-net
  volumes:
    - name: ubuntu
      source: https://cloud-images.ubuntu.com/releases/16.04/release/ubuntu-16.04-server-cloudimg-amd64-disk1.img
      recreatePolicy: IfNotPresent
    - name: seed
      cloud-config:
        user-data: seed.yml
        network-config: network.yml
    - name: data
      size: 10G
      recreatePolicy: Always
  resources:
    cpu: 2
    memory: 2G
---
kind: Network
name: my-net
spec:
  addresses:
    - 10.0.0.1/22