map $domain $no {
    hostnames;

	  default    0;
    bndy.net   1;
    zb.net     2;
}

server {
  server_name bndy.net;

  if ($server_name != $no) {
        rewrite ^/(.*) $scheme://$server_name/$1 permanent;
   }
}

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    if ($no = 1) {
        rewrite ^/(.*) $scheme://$server_name/$1 permanent;
    }
}

Docker

# print the log for container
$: docker logs -f <container-name> 1>/dev/null