使用memcache實現session共享

• 1. Install memcached:

              1.1 Extract it. You can just open memcached.exe to use it. 

              1.2 Test get/set data.

                        Add Client jars in lib of web. See the test code in testMemcache.txt.

                        You can download Client  jars from:

• 2. install apache:

              2.1 You can download it from: 

              2.2 Reference document about how to install:

          

• 3. install one more tomcat:

             3.1 Update three ports in conf/server.xml of tomcat            
                   <Server port="9005" shutdown="SHUTDOWN"> 
                   <Connector port="9595" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />
                   <Connector port="9009" protocol="AJP/1.3" redirectPort="8443" />

             3.2  Configure tomcat cluster: see the "Configure tomcat cluster .txt ".

tomcat集羣配置：

 

1、修改httpd.conf
我的Apache安裝在D:\Program Files\Apache Software Foundation\Apache2.2，找到conf目錄下的httpd.conf，在文件的最後一行添加
include "D:\Program Files\Apache Software Foundation\Apache2.2\conf\mod_jk.conf"
2、新建mod_jk.conf文件，內容如下：
LoadModule jk_module modules/mod_jk-1.2.30-httpd-2.2.3.so
JkWorkersFile conf/workers.properties
#指定那些請求交給tomcat處理,"controller"爲在workers.propertise裏指定的負載分配控制器名
JkMount /* controller
3、將下載的JK插件mod_jk-1.2.30-httpd-2.2.3.so複製到Apache安裝目錄的modules目錄下。
4、新建並編輯workers.properties文件，內容如下：
#server
worker.list = controller,tomcat1,tomcat2
#========tomcat1========
worker.tomcat1.port=8080
worker.tomcat1.host=localhost
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor = 1
#========tomcat2========
worker.tomcat2.port=9595
worker.tomcat2.host=localhost
worker.tomcat2.type=ajp13
worker.tomcat2.lbfactor = 1
 
#========controller,負載均衡控制器========
worker.controller.type=lb
worker.controller.balanced_workers=tomcat1,tomcat2
worker.controller.sticky_session=1

• 4. Add jars in lib of tomcat:

  • kryo-1.04.jar,

  • kryo-serializers-0.10.jar

  • memcached-session-manager-1.6.3.jar

  • memcached-session-manager-tc7-1.6.3.jar

  • minlog-1.2.jar

  • msm-kryo-serializer-1.6.3.jar

  • spymemcached-2.7.3.jar

        You can download these jars from：

 

• 5. Update the <context> element (in  conf/CONTEXT.XML)

 <Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"    
      memcachedNodes="n1:127.0.0.1:11211"    
      requestUriIgnorePattern=".*\.(png|gif|jpg|css|js)$"    
      sessionBackupAsync="false"    
      sessionBackupTimeout="100"    
      transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"    
      copyCollectionsForSerialization="false" 
/>

 

• 6. Test code:

<%  
    String tmp = (String)session.getAttribute("tmp");  
    if(tmp == null || tmp == ""){  
        session.setAttribute("tmp","i am created in tomcat  . my id is : "+session.getId());  
        tmp = (String)session.getAttribute("tmp");  
        out.println(" null now to created value !");  
        out.println("<br/>");  
        out.println(tmp);  
        System.out.println(tmp);  
    }else{  
        out.println(tmp);  
        System.out.println(tmp);  
    }  
%> 

    Test result: you can get the same session id when viewing the print message from different tomcat.