环境：

操作系统：ubuntu 18.04

Nginx版本：nginx version: nginx/1.14.0 (Ubuntu)

nginx安装方法(默认安装方法)：apt install nginx -y 

查看nginx安装参数：

nginx version: nginx/1.14.0 (Ubuntu)
built with OpenSSL 1.1.1  11 Sep 2018
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fdebug-prefix-map=/build/nginx-H4cN7P/nginx-1.14.0=. -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_geoip_module=dynamic --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_sub_module --with-http_xslt_module=dynamic --with-stream=dynamic --with-stream_ssl_module --with-mail=dynamic --with-mail_ssl_module

这里注意到 --with-stream=dynamic 这个模块是动态加载（据说nginx从1.9版本后支持动态加载模块）

修改nginx配置文件：

直接编辑  /etc/nginx/nginx.conf

注意，不要在http{}里修改，可以在 events后面修改，

stream {
  upstream apiserver {
      server 172.16.100.6:6443 weight=5 max_fails=3 fail_timeout=30s;
      server 172.16.100.7:6443 weight=5 max_fails=3 fail_timeout=30s;
      server 172.16.100.8:6443 weight=5 max_fails=3 fail_timeout=30s;
  }
  server {
      listen 6443;
      proxy_pass apiserver;
      proxy_connect_timeout 10s;
      proxy_timeout 300s;
  }
}

接下来就测试后再重新加载下吧

nginx -t

nginx -s reload