ansible/roles/network/templates/netcfg.yaml.j2

# {{ ansible_managed }}

{% if network_interfaces is defined %}
network:
  version: 2
  ethernets:
{% for iface in network_interfaces %}
{% if iface.name is defined %}
     {{ iface.name }}:
{% endif %}
{% if iface.address is defined %}
       addresses:
{% for addr in iface.address %}
         - {{ addr }}
{% endfor %}
{% endif %}
{% if iface.gateway4 is defined %}
       gateway4: {{ iface.gateway4 }}
{% endif %}
{% if iface.gateway6 is defined %}
       gateway6: {{ iface.gateway6 }}
{% endif %}
{% endfor %}
{% else %}
{# Default network configuration #}
network:
  version: 2
  ethernets:
{% if ansible_default_ipv4.interface is defined %}
    {{ ansible_default_ipv4.interface }}:
{% if ansible_default_ipv4.address is defined or ansible_default_ipv6.address is defined %}
      addresses:
{% if ansible_default_ipv4.address is defined %}
        - {{ ansible_default_ipv4.address }}/{{ (ansible_default_ipv4.network + "/" + ansible_default_ipv4.netmask) | ansible.utils.ipaddr('prefix') }}
{% endif %}
{% if ansible_default_ipv6.address is defined %}
        - {{ ansible_default_ipv6.address }}/{{ ansible_default_ipv6.prefix }}
{% endif %}
{% if ansible_default_ipv4.gateway is defined %}
      gateway4: {{ ansible_default_ipv4.gateway }}
{% endif %}
{% if ansible_default_ipv6.gateway is defined %}
      gateway6: {{ ansible_default_ipv6.gateway }}
{% endif %}
{% endif %}
{% endif %}
{% endif %}