Pulp

For environment with ipv6 disabled, provide a option/check to determine if ipv6 listener should be configured.

In roles/pulp_webserver/templates/nginx.conf.j2, the configuration default to always listen on both ipv4 and ipv6.

{% if pulp_webserver_disable_https | bool %}
        listen {{ pulp_webserver_http_port }} default_server deferred;
        listen [::]:{{ pulp_webserver_http_port }} default_server deferred;
{% else %}
        listen {{ pulp_webserver_https_port }} default_server deferred ssl;
        listen [::]:{{ pulp_webserver_https_port }} default_server deferred ssl;

One option may be to base this on the ansible_all_ipv6_addresses fact.

{% if pulp_webserver_disable_https | bool %}
        listen {{ pulp_webserver_http_port }} default_server deferred;
        {% if ansible_all_ipv6_addresses != [] %}
        listen [::]:{{ pulp_webserver_http_port }} default_server deferred;
        {% endif %}
{% else %}
        listen {{ pulp_webserver_https_port }} default_server deferred ssl;
        {% if ansible_all_ipv6_addresses != [] %}
        listen [::]:{{ pulp_webserver_https_port }} default_server deferred ssl;
        {% endif %}