Nginx使用proxy_bind负载tcp socket，解决代理端口耗尽

http {
    upstream backend {
        server 10.0.0.100:1234;
        server 10.0.0.101:1234;
 }

    server {
        # ...
        location / {
            # ...
            proxy_pass http://backend;
            proxy_bind $split_ip;
            proxy_set_header X-Forwarded-For $remote_addr;
        }
    }

    split_clients "$remote_addr$remote_port" $split_ip {
        10%  10.0.0.210;
        10%  10.0.0.211;
        10%  10.0.0.212;
        10%  10.0.0.213;
        10%  10.0.0.214;
        10%  10.0.0.215;
        10%  10.0.0.216;
        10%  10.0.0.217;
        10%  10.0.0.218;
        *    10.0.0.219;
    }
}

https://blog.csdn.net/realmardrid/article/details/111143443

Overcoming Ephemeral Port Exhaustion in NGINX and NGINX Plus