首先安装Apache2.2:

由于安装apache2.2需要先安装arp和arp-util这两个东东所以也要从www.apache.org/dist上下载.

安装apr
# cd srclib/apr
# ./configure --prefix=/usr/local/apr
# make
# make install

安装apr-util
# cd ../apr-util/
# ./configure --prefix=/usr/local/apr-util  --with-apr=/usr/local/apr
# make
# make install

安装 apache(编译时加入ajp代理以及反向代理参数以及负载均衡参数)

#./configure --prefix=/usr/apache2.2 --enable-proxy --enable-proxy-ajp --enable-proxy-balancer --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util

#make

#make install

启动apache:

#/usr/apache2.2/bin/apachectl –k start

负载均衡配置

apache安装成功以后需要对它的两个配置文件conf/httpd.conf和conf/extra/httpd-vhosts.conf做一点小小的修改。
在conf/httpd.conf文件里搜索一下“Include conf/extra/httpd-vhosts.conf”，把前面的“#”去掉。然后“conf/extra/httpd-vhosts.conf”文件修改如下：

<VirtualHost *:80>

   ServerName localhost #服务器名称

   CustomLog logs/dmim_log combined #日志

#负载均衡配置,可列出多个Tomcat;以下为连接Tomcat AJP监听器,

   <Proxy balancer://localhost>

   BalancerMember ajp://134.140.55.236:8009

   BalancerMember ajp://134.140.55.236:9009

   BalancerMember ajp://134.140.55.239:8009

   </Proxy>

#代理配置

   <Location />

   ProxyPass balancer://localhost/

   #ProxyPassReverse balancer://localhost/

   </Location>

</VirtualHost>

集群配置:

Tomcat5.5自带集群功能,只要把server.xml中的“Cluster”元素注释掉就行了,并且在每个web应用项目的web.xml文件，添加<distributable/>元素。然后把tomcat复制几份到不同机器就行了(根据Tomcat官方文档描述一般配置2~4个作为集群,tomcat的配置要跟apache的负载均衡配置相对应);如果集群放在同一台机器上,要注意修改各个server.xml的以下元素: (红色的表示每个服务器配置的端口都不能一样,以免端口被占用)

<Server port="8005" shutdown="SHUTDOWN">

    <Connector port="8080" maxHttpHeaderSize="8192"

               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"

               enableLookups="false" redirectPort="8443" acceptCount="100"

               connectionTimeout="20000" disableUploadTimeout="true" />

<Connector port="8009"

               enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />

        <Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"

                 managerClassName="org.apache.catalina.cluster.session.DeltaManager"

                 expireSessionsOnShutdown="false"

                 useDirtyFlag="true"

                 notifyListenersOnReplication="true">

            <Membership

                className="org.apache.catalina.cluster.mcast.McastService"

                mcastAddr="228.0.0.4"

                mcastPort="45564"

                mcastFrequency="500"

                mcastDropTime="3000"/>

            <Receiver

                className="org.apache.catalina.cluster.tcp.ReplicationListener"

                tcpListenAddress="auto"

                tcpListenPort="4001"

                tcpSelectorTimeout="100"

                tcpThreadCount="6"/>

            <Sender

                className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"

                replicationMode="pooled"

                ackTimeout="15000"

                waitForAck="true"/>

            <Valve className="org.apache.catalina.cluster.tcp.ReplicationValve"

                   filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>

            <Deployer className="org.apache.catalina.cluster.deploy.FarmWarDeployer"

                      tempDir="/tmp/war-temp/"

                      deployDir="/tmp/war-deploy/"

                      watchDir="/tmp/war-listen/"

                      watchEnabled="false"/>

            <ClusterListener className="org.apache.catalina.cluster.session.ClusterSessionListener"/>

        </Cluster>

最后重启apache和各个tomcat就行了