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cloud-init NoCloud の local-init で network を設定させたい場合、cloud-localds--network-config で netplan の設定ファイルを指定できることになっている。指定の通りに netplan の yaml ファイルを作って実行する。

cloud-localds -N network.yaml guest.iso guset.user-data

すると、こんなエラーがでて困っていた。

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 653, in sta>
    ret = functor(name, args)
  File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 362, in mai>
    init.apply_network_config(bring_up=bool(mode != sources.DSMODE_LOCAL))
  File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 699, in apply>
    self.distro.networking.wait_for_physdevs(netcfg)
  File "/usr/lib/python3/dist-packages/cloudinit/distros/networking.py", line 1>
    physdevs = self.extract_physdevs(netcfg)
  File "/usr/lib/python3/dist-packages/cloudinit/distros/networking.py", line 4>
    return net.extract_physdevs(netcfg)
  File "/usr/lib/python3/dist-packages/cloudinit/net/__init__.py", line 493, in>
    raise RuntimeError('Unknown network config version: %s' % version)
RuntimeError: Unknown network config version: None

デバッグしてよーくよく見てみると、network.yaml は次のようになっていないといけない。version はトップレベル。network をトップレベルにしてはいけないということだった。netplan のドキュメントみながら書くとはまってしまった。

---
# DO THIS
version: 2
ethernets: {}
---
# NOT DO THIS
network:
  version: 2
  ethernets: {}
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