Tomcat集群、负载均衡

Tomcat 集群还是有一些局限性。

该功能不会复制有状态的会话 Enterprise JavaBeans（EJB）。 您需要在分布式应用程序中避免使用有状态的会话 EJB。
该功能不会将动态更新复制到 Java 命名和目录接口（JNDI）。您需要为集群每个节点中的分布式应用程序配置所使用的全部 JNDI 名称。
该功能不会将可分布的 Web 应用程序复制到集群中的其他节点。您需要将可分布的 Web 应用程序部署到每个节点。

Quartz集群处理HA

1. 利用http://blog.csdn.net/lifetragedy/article/details/7712691 进行基本配置

2. 利用http://www.cnblogs.com/RUN-TIME/p/4467606.html#配置mod_jk.conf

3. 启动tomcat1和tomcat2， 以及httpd完成tomcat集群

4. 所有对象和Dao数据库连接必须Serializable。如果遇到“unable to apply diff to key”和“java.io.invalidobjectexception could not find a sessionfactory”异常，表示你的Dao数据连接没有被序列化，同时你需要增加以下内容到tomcat的context.xml中。

<Manager className="org.apache.catalina.session.PersistentManager" saveOnRestart="false"   maxActiveSessions="-1" minIdleSwap="-1" maxIdleSwap="-1" maxIdleBackup="-1">
       <Store className="org.apache.catalina.session.FileStore"/>
</Manager>

5. mod_jk.conf
JkMount /*.do controller
JkMount /*WEB-INF controller
JkMount /*j_spring_security_check controller
JkMount /*.action controller
JkMount /servlet/* controller
JkMount /*.jsp controller
JkMount /*.do controller
JkMount /*.action controller
JkMount /* controller
JkMount /*.xhtml controller

6. httpd.conf

Define SRVROOT "D:/Apache24"
ServerRoot "${SRVROOT}"


LoadModule jk_module modules/mod_jk.so
JkWorkersFile "D:/Apache24/conf/workers.properties"  
JkLogFile "D:/Apache24/logs/mod_jk.log"  
JkLogLevel info  
JkMount /servlet/* ajp13  
JkMount /*.jsp ajp13  
JkMount /*.do ajp13 


Include conf/mod_jk.conf


7. workers.properties

worker.list = controller
#tomcat1
worker.tomcat1.port=8009      
worker.tomcat1.host=localhost
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor=1
#tomcat2
worker.tomcat2.port=9009    
worker.tomcat2.host=localhost
worker.tomcat2.type=ajp13
worker.tomcat2.lbfactor=1
#========controller========
worker.controller.type=lb
worker.controller.balance_workers=tomcat1,tomcat2
worker.lbcontroller.sticky_session=0
worker.controller.sticky_session_force=true
worker.connection_pool_size=3000
worker.connection_pool_minsize=50
worker.connection_pool_timeout=50000


8.Tomcat2's server.xml
part1:
<Connector port="9090" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="9443" />
part2:
<Connector port="9009" protocol="AJP/1.3" redirectPort="9443"
                    URIEncoding="UTF-8"  minSpareThreads="25" maxSpareThreads="75"
                            enableLookups="false" disableUploadTimeout="true" connectionTimeout="20000"
                            acceptCount="300"  maxThreads="300" maxProcessors="1000" minProcessors="5"
                            useURIValidationHack="false"
                                      compression="on" compressionMinSize="2048"
compressableMimeType="text/html,text/xml,text/javascript,text/css,text/plain"/>


part3:
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">
        <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"
                         bind="127.0.0.1"
                         address="228.0.0.4"
                         port="45564"
                         frequency="500"
                         dropTime="3000"/>
             <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
                       address="auto"
                       port="4002"
                       selectorTimeout="100"
                       maxThreads="6"/>
             <Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
               <Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender" timeout="60000"/> 
             </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;.*\.xhtml;.*\faces\.xhtml;"/>
              <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
         </Cluster>




参考链接：

http://skanion.iteye.com/blog/1171568

http://publib.boulder.ibm.com/wasce/V2.1/zh_CN/configuring-tomcat-native-clusters.html

http://blog.csdn.net/lifetragedy/article/details/7712691

http://xstarcd.github.io/wiki/Java/tomcat_cluster.html

http://grass51.blog.51cto.com/4356355/1123400

http://www.hello-code.com/blog/Web/201506/5156.html

http://www.ahlinux.com/tomcat/21686.html

http://www.oschina.net/question/1014681_107718

http://www.cnblogs.com/RUN-TIME/p/4467606.html#