apache + tomcat load balance and cluster

load balancer环境应该是1个apache server, 多个tomcat server (tomcat1, tomcat2)
load balance是用apache server进行分流，把请求按照权重以及当时负荷分给tomcat1,tomcat2


tomcat cluster是指在load balance时各个tomcat之间如何共享资源（特别是共享session）

http://blog.csdn.net/liumyong/article/details/336269

http://www.bjfys.com/web/post/754.html

tomcat 5.5 + apache 2.0
http://blog.csdn.net/kypfos/article/details/3081330
http://hi.baidu.com/luodaijun/blog/item/5bbe4cfb5ffef864034f56a1.html


tomcat 6 + apache 2.2
http://jackandroid.iteye.com/blog/627147
http://renren.it/a/fuwuqiruanjian/Tomcat/20101005/48070.html
http://www.mulesoft.com/tomcat-clustering



Tomcat集群Cluster实现原理剖析
http://www.haogongju.net/art/238812