ubuntu下面进行apache+tomcat集群：
1.下载httpd-2.2.19.tar.gz和
apache-tomcat-7.0.20.tar.gz
2.安装apache httpd
先解压：tar -zxvf httpd-2.2.19.tar.gz
切换目录：cd httpd-2.2.19
安装：
./configure --enable-mods-shared='proxy proxy_ajp proxy_balancer proxy_connect proxy_ftp proxy_http proxy_rewrite'
注：如果出
现错误提示：checking whether to enable mod_deflate... configure: error:
mod_deflate has been requested but can not be built due to prerequisite
failures
zlib-devel 没装的原因:
apt-get install zlib1g-dev
make
make install
修改apache的配置文件/usr/local/apache2/conf/httpd.conf：Listen 80 修改为9999. 非root用户默认是不能用80端口。
测试是否安装成功：
#/usr/local/apache2/bin/httpd –k start
打开浏览器，输入：http://localhost:9999
，显示“It works
”，安装成功。
3.安装两个tomcat
解压apache-tomcat-7.0.20.tar.gz。复制为tomcat1，tomcat2
4.修改tomcat2中的端口不要和tomcat1重复。
5.修改tomcat1/conf/server.xml文件：
1、找到<Engine name="Catalina" defaultHost="localhost">，修改成<Engine name="Catalina" defaultHost="localhost"
jvmRoute="tomcat1"
>
2、在Engine
标签内，加入以下：
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="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="auto"
port="4000" <!--tomcat2不要重复这个端口号-->
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
<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"/>
</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>
tomcat2做类似的修改，粗字体不要重复即可
3、修改apache的配置文件/usr/local/apache2/conf/httpd.conf：
在文件的最后加入以下：
修改apache的配置文件/usr/local/apache2/conf/httpd.conf：
在文件的最后加入以下：
NameVirtualHost 192.168.1.158:9999
<VirtualHost 192.168.1.158:9999>
ServerAdmin abc@163.com
#本机的IP地址
ServerName 192.168.1.158
ServerAlias 192.168.1.158
ProxyPass / balancer://cluster/ stickysession=JSESSIONID|jsessionid nofailover=On
ProxyPassReverse / balancer://cluster/
#ErrorLog "logs/error.log"
#CustomLog "logs/access.log" common
</VirtualHost>
#The ProxyRequests directive should usually be set off when using ProxyPass.
ProxyRequests Off
<proxy balancer://cluster>
BalancerMember ajp://192.168.1.158:8009 loadfactor=1 route=tomcat1 smax=5 max=20 ttl=120 retry=300 timeout=15
BalancerMember ajp://192.168.1.158:9009 loadfactor=1 route=tomcat2 smax=5 max=20 ttl=120 retry=300 timeout=15
ProxySet lbmethod=bytraffic
</proxy>
注：ajp://192.168.1.158:8009 的端口一定要与对应的tomcat的server.xml中的<Connector port="8009"
protocol="AJP/1.3" redirectPort="8443" />的端口一致。
6.测试集群
1、创建一个java web project，命名为Test
2、修改web.xml，加入<distributable/>
3、创建index.jsp页面，内容如下：
<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="java.util.*" %>
<html><head><title>Cluster Test</title></head>
<body>
<%
//HttpSession session = request.getSession(true);
System.out.println(session.getId());
out.println("<br> SESSION ID:" + session.getId()+"<br>");
// 如果有新的请求，则添加session属性
String name = request.getParameter("name");
if (name != null && name.length() > 0) {
String value = request.getParameter("value");
session.setAttribute(name, value);
}
out.print("<b>Session List:</b>");
Enumeration<String> names = session.getAttributeNames();
while (names.hasMoreElements()) {
String sname = names.nextElement();
String value = session.getAttribute(sname).toString();
out.println( sname + " = " + value+"<br>");
System.out.println( sname + " = " + value);
}
%>
</body>
</html>
把java web project工程复制到两个tomcat的webapp目录中。启动tomcat：./startup.sh和apache：./httpd -k start。在浏览器中输入：http://localhost:9999/Test/index.jsp
以上步骤只是为了记录本人的一点操作流程，这年头好记性不如破网络。
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