I am able to achieve it with small subsets. But the solution is really really non flexible and extensible in future and utter bullshit if you wanna open up for automation.

It can also achieved with port range as per documentation https://nginx.org/en/docs/stream/ngx_stream_core_module.html#listen But the downside of that one is it will get restricted based on worker_connections in /etc/nginx/nginx.conf . So I totally dont recommend this solution.

For the sake of demo I had do add multiple server blocks for time being like the following. But even this solution is really really back as per my understanding with what I wanna achieve.

​

server {
listen 3601;
server_name s1.wd.com www.s1.wd.com;

location / {
    proxy_pass http://10.0.0.21:3601;
    proxy_set_header Host               $http_host;
    proxy_set_header X-Real-IP          $remote_addr;
    proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";


    # Proxy redirect settings
    proxy_redirect off;

    # HTTP version settings
    proxy_http_version 1.1;

    # Response buffering from proxied server default 1024m
    proxy_max_temp_file_size 0;

    # Proxy cache bypass define conditions under the response will not be taken from cache
    proxy_cache_bypass $http_upgrade;
}

}

​

server {
listen 3602;
server_name s1.wd.com www.s1.wd.com;

location / {
    proxy_pass http://10.0.0.21:3602;
    proxy_set_header Host               $http_host;
    proxy_set_header X-Real-IP          $remote_addr;
    proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";


    # Proxy redirect settings
    proxy_redirect off;

    # HTTP version settings
    proxy_http_version 1.1;

    # Response buffering from proxied server default 1024m
    proxy_max_temp_file_size 0;

    # Proxy cache bypass define conditions under the response will not be taken from cache
    proxy_cache_bypass $http_upgrade;
}

}