nginx-proxy/nginx.tmpl

server {
    listen 80 default_server;
    server_name _; # This is just an invalid value which will never trigger on a real hostname.
    return 503;
}
{{ range $host, $containers := groupBy $ "Env.VIRTUAL_HOST" }}
upstream {{ $host }} {

{{ range $index, $value := $containers }}

	{{ $addrLen := len $value.Addresses }}
	{{/* If only 1 port exposed, use that */}}
	{{ if eq $addrLen 1 }}
		{{ with $address := index $value.Addresses 0 }}
		   # {{$value.Name}}
		   server {{ $address.IP }}:{{ $address.Port }};
		{{ end }}

	{{/* If more than one port exposed, use the one matching VIRTUAL_PORT env var */}}
	{{ else if $value.Env.VIRTUAL_PORT }}
		{{ range $i, $address := $value.Addresses }}
		   {{ if eq $address.Port $value.Env.VIRTUAL_PORT }}
		   # {{$value.Name}}
		   server {{ $address.IP }}:{{ $address.Port }};
		   {{ end }}
		{{ end }}

	{{/* Else default to standard web port 80 */}}
	{{ else }}
		{{ range $i, $address := $value.Addresses }}
		   {{ if eq $address.Port "80" }}
		   # {{$value.Name}}
		   server {{ $address.IP }}:{{ $address.Port }};
		   {{ end }}
		{{ end }}
    {{ end }}
{{ end }}
}

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

	server_name {{ $host }};
        proxy_buffering off;

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