nginx server_name inside stream block possible?

Question

Current setup as follows:

stream {
    server {
        listen 9987 udp;

        server_name  subdomain.EXAMPLE.com; # this line is resulting in an error

        proxy_pass localhost:9987;
        proxy_timeout 1s;
        proxy_responses 1;
        error_log logs/dns.log;
    }
}

server_name subdomain.EXAMPLE.com;

Is this possible?

$nginx -t

$nginx: [emerg] "server_name" directive is not allowed here in /etc/nginx/nginx.conf:15

Works just fine without server_name, but I'd like to use a sub-domain if possible. (I am using a build with --with-stream, thats not my issue.)

Merengue

An alternative approach that may work for some is to bind against a specific IP address: listen x.x.x.x:9987 udp – Osiris

Answer 1

TCP has no concept of server names, so this is not possible. It only works in HTTP because the client sends the hostname it is trying to access as part of the request, allowing nginx to match it to a specific server block.

Source: https://forum.nginx.org/read.php?2,263208,263217#msg-263217

Merengue

Hello, this seems unexact as another post indicates that Nginx has the ability to read the SNI header in the SSL handshake before passing the request to the upstream server : serverfault.com/a/999428 – Geralyngeraniaceous

Answer 2

While it is not in the original nginx, it is implemented in a Chinese fork of it via SNI: https://tengine.taobao.org/document/stream_sni.html

Underscore

Answer 3

It's now possible, as of NGINX 1.25.5

More info here: https://nginx.org/en/docs/stream/ngx_stream_core_module.html#server_name

Sachiko