Apache负载均衡-session共享

Apache负载均衡实战
              含Session共享
一 准备工作
下载Apache、tomcat
    2个或者多个tomcat
F:\JavaProgram\apache-tomcat-7.0.64-8088
F:\JavaProgram\apache-tomcat-7.0.64-8080
1个apache
F:\Apache24\bin

下载mod_jk.so
将此文件添加到目录F:\Apache24\modules
二 配置文件
1 修改Apache conf目录下的httpd.conf
在最后一行添加
include "F:\Apache24\conf\mod_jk.conf"

2 新建mod_jk.conf文件
在目录F:\Apache24\conf下添加文件,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 /* controller

3 tomcat配置
在Server.xml文件中添加两端配置:

<Engine defaultHost="localhost" name="Catalina" jvmRoute="tomcat2">

集群配置:
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
                 channelSendOptions="6">
          <Manager className="org.apache.catalina.ha.session.BackupManager"
                   expireSessionsOnShutdown="false"
                   notifyListenersOnReplication="true"
                   mapSendOptions="6"/>

          <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="5000"
                      selectorTimeout="100"
                      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"/>
            <Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
          </Channel>

          <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
                 filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>

          <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.ClusterSessionListener"/>
        </Cluster>

4 应用配置
需要在应用的web.xml文件中添加如下配置,表示该应用将在分布式容器中部署:
  <distributable/>

5 新建workers.properties文件
在目录F:\Apache24\conf下添加文件,内容如下
#server
worker.list = controller
#========tomcat1========
worker.tomcat1.port=8009
worker.tomcat1.host=127.0.0.1
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor = 1

#========tomcat2========
worker.tomcat2.port=8019
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


附一 Apache基本的操作方法:
本文假设你的apahce安装目录为/usr/local/apache2,这些方法适合任何情况
apahce启动命令:
推荐/usr/local/apache2/bin/apachectl start apache启动
apache停止命令
/usr/local/apache2/bin/apachectl stop   停止
apache重新启动命令:
/usr/local/apache2/bin/apachectl restart 重启
要在重启 Apache 服务器时不中断当前的连接,则应运行:
/usr/local/sbin/apachectl graceful

附二 引申以及需要注意的问题:
1、 session复制的方式:BackupManager与DeltaManager
2、 Java应用session的value需要序列化,否则无法实现session共享

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