nginx+tomcat高性能负载均衡集群：https://www.cnblogs.com/gcjava/p/6601293.html
apache+tomcat+mod_jk：https://blog.csdn.net/johnstrive/article/details/4555198
nginx+tomcat+memcached：https://blog.csdn.net/zht666/article/details/38515147
nginx(web server loadbalance) + redis(session server) + tomcat(app server)：https://m.imooc.com/article/21377
nginx服务器讲解：https://www.cnblogs.com/jiekzou/p/4486447.html
keepalived+nginx双主高可用负载均衡：https://www.linuxidc.com/Linux/2017-05/143739.htm
一个tomcat最多可以承载多少访问量？