The same Docker image cannot work both on IPv4-only and IPv6 networks

[hoh]

Deployments with IPv6 require forking the image or overwriting nginx.conf.

When listening on listen [::]:80;, @pando85 reported in #189 that IPv4-only Docker installs do not work as Nginx is trying to bind on IPv6 and fails.

However, when binding on listen 80 in this repo's config, it appears that Nginx only binds on IPv4 and is not reachable over IPv6.

The issue seems more complex than I expected as the official Nginx Docker image itself is using an entrypoing bash script to replace the listen 80 line before running Nginx:

# enable ipv6 on default.conf listen sockets
sed -i -E 's,listen       80;,listen       80;\n    listen  [::]:80;,' /$DEFAULT_CONF_FILE

Any idea how to solve this and have the same image on

Related links:

• https://nginx.org/en/docs/http/ngx_http_core_module.html#listen
• https://github.com/nginxinc/docker-nginx/blob/2ef3fa66f2a434cd5e44e35a02f4ac502cf50808/stable/buster/10-listen-on-ipv6-by-default.sh#L57
• https://github.com/wallabag/docker/pull/173
• https://github.com/wallabag/docker/pull/189