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Apache+Tomcat配置负载均衡

2012-10-10 11:00 246 查看
由于集团开始实施个人任务管理模块,内部业务支撑平台的使用人数直线上升,每个月的月初在线人数达到顶峰,原有的一个Tomcat已经胜任不了,俺决定通过负载均衡来解决。

之前没搞过负载均衡,于是乎,在各大搜索网站搜索文档无数。从原理着手,先理解一下原理,有助于接下来的实施,然后再找找有哪些技术和方案,最后决定用Apache+Tomcat配置负载均衡来解决

接下来就开始在虚拟机上搞实验,俺的是笔记本,开两个虚拟机,卡得我想吐。喝了半怀咖啡,鼠标才给我动两下,伤不起呀。果断关掉一个虚拟机,决定在一个虚拟机内开两个Tomcat来测试:

1、首先需要下载相关的文件:

Apache: httpd-2.2.17-win32-x86-no_ssl.msi

Tomcat: apache-tomcat-6.0.35-windows-x86.zip

模块 : tomcat-connectors-1.2.37-windows-i386-httpd-2.2.x.zip

JDK : jdk-6u10-rc2-bin-b32-windows-i586-p-12_sep_2008.exe

2、安装JDK文件,配置JDK环境

3、安装Apache服务器,按照网上查的资料,需要配置以下文件

修改http.conf,在文件最后加上下面一句话就可以了:include "安装目录\Apache Software Foundation\Apache2.2\conf\mod_jk.conf"

复制mod_jk.so到安装目录\Apache Software Foundation\Apache2.2\modules

http.conf同目录下新建mod_jk.conf文件,内容如下:

LoadModule jk_module modules/mod_jk.so

JkWorkersFile conf/workers.properties

#指定那些请求交给tomcat处理,"controller"为在workers.propertise里指定的负载分配控制器名
JkMount /*.jsp controller

在http.conf同目录下新建 workers.properties文件,内容如下

#server

worker.list = controller

#========tomcat1========

worker.tomcat1.port=11009

worker.tomcat1.host=localhost

worker.tomcat1.type=ajp13

worker.tomcat1.lbfactor = 1

#========tomcat2========

worker.tomcat2.port=12009

worker.tomcat2.host=localhost

worker.tomcat2.type=ajp13

worker.tomcat2.lbfactor = 1

#========tomcat3========

#worker.tomcat3.port=13009

#worker.tomcat3.host=192.168.0.80 //在我的虚拟机中的,可以算远程的吧 #worker.tomcat3.type=ajp13

#worker.tomcat3.lbfactor = 1

#========controller,负载均衡控制器========

worker.controller.type=lb

#worker.controller.balanced_workers=tomcat1,tomcat2,tomcat3 worker.controller.balanced_workers=tomcat1,tomcat2

worker.controller.sticky_session=false worker.controller.sticky_session_force=1 #worker.controller.sticky_session=1

4、安装Tomcat,并配置如下:

修改SERVER.XML文件

1)、<Connector port="11009" protocol="AJP/1.3" redirectPort="8443" />

2)、 <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">

3)、<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="8">
<!--

<Manager className="org.apache.catalina.ha.session.BackupManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"
mapSendOptions="8"/> -->
<!-- -->
<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>

<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="localhost"
port="4000"
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
<!-- timeout="60000"-->
<Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender" />
</Sender>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
</Channel>

<Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
filter=""/>
<Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>

<Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>

<ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>

编写测试页面test2.jsp

<%@ page contentType="text/html; charset=GBK" %>

<%@ page import="java.util.*" %>

<html><head><title>Cluster App Test</title></head>

<body>

Server Info:

<%

out.println(request.getLocalAddr() + " : " + request.getLocalPort()+"<br>");%>

<%

out.println("<br> ID " + session.getId()+"<br>");

// 如果有新的 Session 属性设置

String dataName = request.getParameter("dataName");

if (dataName != null && dataName.length() > 0) {

String dataValue = request.getParameter("dataValue");

session.setAttribute(dataName, dataValue);

}

out.println("<b>Session 列表</b><br>");

System.out.println("============================");

Enumeration e = session.getAttributeNames();

while (e.hasMoreElements()) {

String name = (String)e.nextElement();

String value = session.getAttribute(name).toString();

out.println( name + " = " + value+"<br>");

System.out.println( name + " = " + value);

}

%>

<form action="test2.jsp" method="POST">

名称:<input type=text size=20 name="dataName">

<br>

值:<input type=text size=20 name="dataValue">

<br>

<input type=submit>

</form>

</body>

</html>

修改项目下面的web.xml,加入<distributable/>

测试成功,Session同步复制
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