# cloud-init's network-config schema (distinct from the #cloud-config
# user-data schema in server.yaml.tpl/agent.yaml.tpl — no "#cloud-config"
# header here, and `version: 2` picks the netplan-style dialect). eth0 is
# the interface name libvirt's virtio NIC presents as inside a fresh
# Ubuntu cloud image — the only interface that exists at boot, since each
# node has exactly one network_interface in main.tf's libvirt_domain.
# `nameservers` points at the gateway rather than a public resolver
# because that's also where libvirt's own DNS forwarder listens (the `dns
# { enabled = true }` block on libvirt_network.k3s in main.tf) — it
# resolves both k3s.local addresses and forwards everything else out.
version: 2
ethernets:
  eth0:
    addresses:
      - ${ip}/${prefix_length}
    gateway4: ${gateway}
    nameservers:
      addresses: [${gateway}]