include /etc/nginx/modules/http_lua.conf;

events {}

set_by_lua $nginx_proxy_source_port 'return os.getenv("$NGINX_PROXY_SOURCE_PORT")';
set_by_lua $nginx_proxy_source_address 'return os.getenv("$NGINX_PROXY_SOURCE_ADDRESS")';

stream {
    server {

        listen $nginx_proxy_source_port;
        proxy_pass $nginx_proxy_source_address;
    }
}