Node Interface Naming

Problem

Hetzner servers don't guarantee consistent NIC names across reboots. eno1 might become enp3s0 after a kernel update, breaking VLAN configuration and OVN bridge mapping.

Solution

systemd-networkd link files match interfaces by MAC address and force consistent names:

systemd.network.links = {
  "00-eno1" = {
    matchConfig.PermanentMACAddress = "b4:2e:99:cd:02:76"; # lucy's MAC
    linkConfig.Name = "eno1";
  };
  "01-enp3s0" = {
    matchConfig.PermanentMACAddress = "6c:b3:11:5d:26:7a"; # lucy's OpenStack NIC
    linkConfig.Name = "enp3s0";
  };
};

Each node profile (lucy, makise, quinn) defines its own MAC addresses. This ensures eno1 always carries Kubernetes traffic and enp3s0 always connects to br-ex.