nginx.config

worker_processes 4;
worker_rlimit_nofile 40000;
include /etc/nginx/modules-enabled/*.conf;

events {
    worker_connections 8192;
}

stream {
        upstream http_servers {
                least_conn;
                server <NODE_IP>:80 max_fails=3 fail_timeout=5s;
                server <NODE_IP>:80 max_fails=3 fail_timeout=5s;
                server <NODE_IP>:80 max_fails=3 fail_timeout=5s;
                server <NODE_IP>:80 max_fails=3 fail_timeout=5s;
        }

        upstream https_servers {
                least_conn;
                server <NODE_IP>:443 max_fails=3 fail_timeout=5s;
                server <NODE_IP>:443 max_fails=3 fail_timeout=5s;
                server <NODE_IP>:443 max_fails=3 fail_timeout=5s;
                server <NODE_IP>:443 max_fails=3 fail_timeout=5s;
        }

        upstream k3s_servers {
                server <CONTROL_NODE_IP>:6443;
                server <CONTROL_NODE_IP>:6443;
        }

        server {
                listen 80;
                proxy_pass http_servers;
        }

        server {
                listen 443;
                proxy_pass https_servers;
        }

        server {
                listen 6443;
                proxy_pass k3s_servers;
        }
}