mod_cluster 介绍
mod_cluster 是一个基于HTTP协议的负载均衡和集群的 Apache 模块，支持使用Tomcat的应用服务器，例如 Tomcat 和 JBoss
AS
Where mod_cluster differs from mod_jk and mod_proxy is that it provides a back
channel from the webservers back to the httpd servers. The webservers use this
back channel to provide @R_304_4045@ion to the httpd-side about their current
state. The use of this back channel provides a number of advantages,
including:
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Dynamic configuration of httpd workers.
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Server-side load balance factor calculation.
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Fine grained web-app lifecycle control.
An added benefit of mod_cluster is that, unlike mod_jk, use of the AJP
protocol between httpd and the back-end servers will be optional. The httpd
connections to application server nodes can use HTTP, HTTPS, or AJP. (Note
that in this first beta release, testing has been focused on AJP.)