kubespray/roles/kubernetes/node/templates/loadbalancer/nginx.conf.j2

error_log stderr notice;

worker_processes 2;
worker_rlimit_nofile 130048;
worker_shutdown_timeout 10s;

events {
  multi_accept on;
  use epoll;
  worker_connections 16384;
}

stream {
  upstream kube_apiserver {
    least_conn;
    {% for host in groups['kube_control_plane'] -%}
    server {{ hostvars[host]['access_ip'] | default(hostvars[host]['ip'] | default(fallback_ips[host])) }}:{{ kube_apiserver_port }};
    {% endfor -%}
  }

  server {
    listen        127.0.0.1:{{ loadbalancer_apiserver_port|default(kube_apiserver_port) }};
    proxy_pass    kube_apiserver;
    proxy_timeout 10m;
    proxy_connect_timeout 1s;
  }
}

http {
  aio threads;
  aio_write on;
  tcp_nopush on;
  tcp_nodelay on;

  keepalive_timeout {{ loadbalancer_apiserver_keepalive_timeout }};
  keepalive_requests 100;
  reset_timedout_connection on;
  server_tokens off;
  autoindex off;

  {% if loadbalancer_apiserver_healthcheck_port is defined -%}
  server {
    listen {{ loadbalancer_apiserver_healthcheck_port }};
    location /healthz {
      access_log off;
      return 200;
    }
    location /stub_status {
      stub_status on;
      access_log off;
    }
  }
  {% endif %}
}