gistfile1.txt

{{ range $host, $containers := groupBy $ "Env.VIRTUAL_HOST" }}
upstream {{ $host }} {

{{ range $index, $value := $containers }}
    {{ with $address := index $value.Addresses 0 }}
    server {{ $address.IP }}:{{ $address.Port }};
    {{ end }}
{{ end }}

}

server {
    #ssl_certificate /etc/nginx/certs/demo.pem;
    #ssl_certificate_key /etc/nginx/certs/demo.key;

    gzip_types text/plain text/css application/json application/x-javascript
               text/xml application/xml application/xml+rss text/javascript;

    server_name {{ $host }};

    location / {
        proxy_pass http://{{ $host }};
        include /etc/nginx/proxy_params;
    }
}
{{ end }}