tomcat集群下的session共享和负载均衡（apache实现）

环境

操作系统：windows
tomcat1：Apache Tomcat/7.0.52（8085）
tomcat2：Apache Tomcat/7.0.52（8086）
jdk：1.8.0_251
apache-http：httpd-2.2.17-win32-x86-no_ssl（8888）

说明

基于httpd实现的session共享、负载均衡和反向代理。

部署

httpd配置

1、直接双击httpd-2.2.17-win32-x86-no_ssl.msi文件安装httpd

2、修改httpd\conf\httpd.conf

修改监听端口

Listen 8888

增加自定义配置文件的引入

include "D:\software\httpd\conf\mod_jk.conf"

3、在httpd\conf\下新建mod_jk.conf文件

内容：

LoadModule jk_module modules/mod_jk-1.2.31-httpd-2.2.3.so
JkWorkersFile conf/workers.properties
JkMount /*.jsp controller

4、复制JK插件mod_jk-1.2.31-httpd-2.2.3.so到httpd\modules\下

5、在httpd\conf\下新建workers.properties文件

#server 
worker.list=controller
#========tomcat1======== 
worker.tomcat1.port=8025
worker.tomcat1.host=127.0.0.1
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor=1

#========tomcat2======== 
worker.tomcat2.port=8026
worker.tomcat2.host=127.0.0.1
worker.tomcat2.type=ajp13
worker.tomcat2.lbfactor=1

#========controller,负载均衡控制器======== 
worker.controller.type=lb
worker.controller.balanced_workers=tomcat1,tomcat2
worker.controller.sticky_session=false
worker.controller.sticky_session_force=1
#worker.controller.sticky_session=1

说明：

1、worker.xxx.port/host/type/lbfactor中的xxx为tomcat中server.xml内的jvmRoute标签的内容

2、port是AJP/1.3的端口号

tomcat配置

1、在tomcat\conf\server.xml中：

修改ip和端口号

<Connector port="8085" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
<Connector port="8025" protocol="AJP/1.3" redirectPort="8443" />

增加jvmRoute配置

<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">
...

增加集群配置

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>

tomcat测试资源

1、部署test.jsp到测试包内

test.jsp内容参考如下（title和h1的内容可根据不同的tomcat进行调整以方便观察）：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>tomcat1</title>
</head>
<body>
<center><h1>tomcat1</h1></center>
<center>
<h3>sessionId:</h3><%=session.getId()%>
<h3>session创建时间：</h3><%=session.getCreationTime()%>
<center>
</body>
</html>

2、在所有工程包的web.xml中添加<distributable/>配置

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  version="3.0"
  metadata-complete="true">

  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>
<distributable/>
</web-app>