hosts.j2

127.0.0.1	localhost
::1     localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

{% for host in hosts_alternates %}
{{ host }}	{{ ansible_host }} {{ inventory_hostname }}
{% else %}
{{ ansible_default_ipv4.address }}	{{ ansible_host }} {{ inventory_hostname }}
{% if 'address' in ansible_default_ipv6 %}
{{ ansible_default_ipv6.address }}	{{ ansible_host }} {{ inventory_hostname }}
{% endif %}
{% endfor %}

{% for host in hosts_additionals %}
{{ host.address }}	{{ host.names|join(' ') }}
{% endfor %}