THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- Ensure that every object placed in the HTTP session implements java.io.Serializable. The clustering feature serializes the objects when it distributes them to the other nodes in the cluster.
- The deployment descriptor for your Web application, that is the
web.xmlfile in the Web archive, must indicate that your Web application is distributable. To do this, insert the distributable element in the deployment descriptor.Code Block XML XML borderStyle solid title Excerpt from web.xml borderStyle solid <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app> <display-name> ... </display-name> <description> ... </description> <distributable> <distributable/> ... </web-app> - Do not use stateful session Enterprise JavaBeans (EJBs). The clustering feature does not replicate stateful EJBs among the nodes in the cluster.
- If your Web application uses a database, every node in the cluster can access the database. Ensure that the JDBC drivers are installed on every node and that the datasource objects are defined correctly on every node.
- Do not depend on dynamic updates to the Java Naming and Directory Interface (JNDI). You need to configure all the JNDI names used by your application in every node of the cluster. The clustering feature does not replicate JNDI changes among the nodes in the cluster.
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- For every node in the cluster, update
server.xmlas follows after the server is stopped:
whereCode Block XML XML borderStyle solid title Excerpt from server.xml borderStyle solid ... <Engine name="Catalina" defaultHost="${ServerHostname}" jvmRoute="nodeId"> ...- nodeId is a node identifier that is unique among all the nodes in the cluster. If you are using mod_jk, make sure that the jvmRoute attribute value matches your worker name in
workers.properties.
- nodeId is a node identifier that is unique among all the nodes in the cluster. If you are using mod_jk, make sure that the jvmRoute attribute value matches your worker name in
- Restart the server to enable the new configuration.
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The template for your Web application deployment plan is shown as follows. See Creating deployment plans for Web applications for more information about the parameters.
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<web-app xmlns="http://geronimo.apache.org/xml/ns/j2ee/web/tomcat-1.2"
xmlns:dep="http://geronimo.apache.org/xml/ns/deployment-1.2">
<dep:environment>
<dep:moduleId>
<dep:groupId>org.mygroup</dep:groupId>
<dep:artifactId>web-cluster-server1</dep:artifactId>
<dep:version>2.2</dep:version>
<dep:type>war</dep:type>
</dep:moduleId>
<dep:dependencies>
<dep:dependency>
<dep:groupId>console.realm</dep:groupId>
<dep:artifactId>geronimo-properties-realm</dep:artifactId>
<dep:version>1.0</dep:version>
<dep:type>car</dep:type>
</dep:dependency>
</dep:dependencies>
<dep:hidden-classes/>
<dep:non-overridable-classes/>
</dep:environment>
<context-root>/servlet-examples-cluster</context-root>
<security-realm-name>geronimo-properties-realm</security-realm-name>
<security>
<default-principal>
<principal name="anonymous" class="org.apache.geronimo.security.realm.providers.GeronimoUserPrincipal"/>
</default-principal>
<role-mappings>
<role role-name="tomcat">
<principal name="admin" class="org.apache.geronimo.security.realm.providers.GeronimoGroupPrincipal"/>
</role>
</role-mappings>
</security>
<cluster>TomcatCluster</cluster>
<gbean class="org.apache.geronimo.tomcat.cluster.CatalinaClusterGBean" name="TomcatCluster">
<attribute name="className">org.apache.catalina.ha.tcp.SimpleTcpCluster</attribute>
<attribute name="initParams"/>
<reference name="ClusterManager">
<name>TomcatClusterManager</name>
</reference>
<reference name="TomcatValveChain">
<name>ReplicationValve</name>
</reference>
<reference name="ClusterListenerChain">
<name>ClusterSessionListener</name>
</reference>
<reference name="Channel">
<name>TomcatGroupChannel</name>
</reference>
</gbean>
<!-- Cluster Manager -->
<gbean name="TomcatClusterManager" class="org.apache.geronimo.tomcat.cluster.ClusterManagerGBean">
<attribute name="className">org.apache.catalina.ha.session.DeltaManager</attribute>
<attribute name="initParams">name=${clusterName}
channelSendOptions=6
expireSessionsOnShutdown=false
notifyListenersOnReplication=true
mapSendOptions=6</attribute>
</gbean>
<!-- Cluster Channel -->
<gbean class="org.apache.geronimo.tomcat.cluster.ChannelGBean" name="TomcatGroupChannel">
<attribute name="className">org.apache.catalina.tribes.group.GroupChannel</attribute>
<attribute name="initParams"/>
<reference name="Membership">
<name>TomcatMembership</name>
</reference>
<reference name="Receiver">
<name>TomcatReceiver</name>
</reference>
<reference name="Sender">
<name>TomcatSender</name>
</reference>
<reference name="ChannelInterceptor">
<name>TomcatChannelInterceptor</name>
</reference>
</gbean>
<!-- Cluster Membership -->
<gbean class="org.apache.geronimo.tomcat.cluster.MembershipServiceGBean" name="TomcatMembership">
<attribute name="className">org.apache.catalina.tribes.membership.McastService</attribute>
<attribute name="initParams">
mcastAddr=228.0.0.4
mcastPort=45564
mcastFrequency=500
mcastDropTime=3000
</attribute>
</gbean>
<!-- Cluster Receiver -->
<gbean class="org.apache.geronimo.tomcat.cluster.ReceiverGBean" name="TomcatReceiver">
<attribute name="className">org.apache.catalina.tribes.transport.nio.NioReceiver</attribute>
<attribute name="initParams">
tcpListenAddress=auto
tcpListenPort=4001
tcpSelectorTimeout=100
tcpThreadCount=6
</attribute>
</gbean>
<!-- Cluster Sender -->
<gbean class="org.apache.geronimo.tomcat.cluster.SenderGBean" name="TomcatSender">
<attribute name="className">org.apache.catalina.tribes.transport.ReplicationTransmitter</attribute>
<attribute name="initParams">
replicationMode=pooled
waitForAck=true
</attribute>
</gbean>
<!-- Cluster Valves-->
<gbean class="org.apache.geronimo.tomcat.ValveGBean" name="ReplicationValve">
<attribute name="className">org.apache.catalina.ha.tcp.ReplicationValve</attribute>
<attribute name="initParams">filter=.*\.gif;.*\.js;.*\.css;.*\.png;.*\.jpeg;.*\.jpg;.*\.htm;.*\.html;.*\.txt;</attribute>
<reference name="NextValve">
<name>JvmRouteBinderValve</name>
</reference>
</gbean>
<!-- Cluster Route Binder -->
<gbean class="org.apache.geronimo.tomcat.ValveGBean" name="JvmRouteBinderValve">
<attribute name="className">org.apache.catalina.ha.session.JvmRouteBinderValve</attribute>
<attribute name="initParams">enabled=true</attribute>
</gbean>
<!-- Cluster Listener -->
<gbean class="org.apache.geronimo.tomcat.cluster.ClusterListenerGBean" name="ClusterSessionListener">
<attribute name="className">org.apache.catalina.ha.session.ClusterSessionListener</attribute>
<reference name="NextListener">
<name>JvmRouteSessionIDBinderListener</name>
</reference>
</gbean>
<!-- Cluster Binder Listener-->
<gbean class="org.apache.geronimo.tomcat.cluster.ClusterListenerGBean" name="JvmRouteSessionIDBinderListener">
<attribute name="className">org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener</attribute>
</gbean>
<!-- Cluster Channel Interceptor -->
<gbean class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean" name="TomcatChannelInterceptor">
<attribute name="className">org.apache.catalina.tribes.group.interceptors.TcpFailureDetector</attribute>
</gbean>
</web-app>
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The following code snippet is part of a clustering example that uses unicast configuration. Static members are defined using org.apache.geronimo.tomcat.cluster.StaticMemberGBean. You have to define each static member within your deployment plan to make sure that your application is clustered successfully, and make sure that TCP ports for session replication are defined consistently on each node.
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<cluster>TomcatCluster</cluster>
<gbean name="TomcatCluster" class="org.apache.geronimo.tomcat.cluster.CatalinaClusterGBean">
<attribute name="className">org.apache.catalina.ha.tcp.SimpleTcpCluster</attribute>
<attribute name="initParams"/>
<reference name="ClusterListenerChain">
<name>TomcatClusterListenerChain</name>
</reference>
<reference name="TomcatValveChain">
<name>ReplicationValve</name>
</reference>
<reference name="Channel">
<name>TomcatChannel</name>
</reference>
<reference name="ClusterManager">
<name>TomcatClusterManager</name>
</reference>
</gbean>
<gbean name="TomcatClusterListenerChain" class="org.apache.geronimo.tomcat.cluster.ClusterListenerGBean">
<attribute name="className">org.apache.catalina.ha.session.ClusterSessionListener</attribute>
<attribute name="initParams"/>
</gbean>
<gbean name="ReplicationValve" class="org.apache.geronimo.tomcat.ValveGBean">
<attribute name="className">org.apache.catalina.ha.tcp.ReplicationValve</attribute>
<attribute name="initParams">.*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;</attribute>
<reference name="NextValve">
<type>TomcatValve</type>
<name>JvmRouteBinderValve</name>
</reference>
</gbean>
<gbean name="JvmRouteBinderValve" class="org.apache.geronimo.tomcat.ValveGBean">
<attribute name="className">org.apache.catalina.ha.session.JvmRouteBinderValve</attribute>
<attribute name="initParams">enabled=true</attribute>
</gbean>
<gbean name="TomcatClusterManager" class="org.apache.geronimo.tomcat.cluster.ClusterManagerGBean">
<attribute name="className">org.apache.catalina.ha.session.DeltaManager</attribute>
<attribute name="initParams">name=${clusterName}
channelSendOptions=6
expireSessionsOnShutdown=false
notifyListenersOnReplication=true
mapSendOptions=6
</attribute>
</gbean>
<gbean name="TomcatChannel" class="org.apache.geronimo.tomcat.cluster.ChannelGBean">
<attribute name="className">org.apache.catalina.tribes.group.GroupChannel</attribute>
<attribute name="initParams"/>
<reference name="Membership">
<name>ClusterMembership</name>
</reference>
<reference name="Receiver">
<name>ClusterReceiver</name>
</reference>
<reference name="Sender">
<name>ClusterSender</name>
</reference>
<reference name="ChannelInterceptor">
<name>DisableMcastInterceptor</name>
</reference>
</gbean>
<gbean name="ClusterMembership" class="org.apache.geronimo.tomcat.cluster.MembershipServiceGBean">
<attribute name="className">org.apache.catalina.tribes.membership.McastService</attribute>
<attribute name="initParams">address=228.0.0.4
port=45564
frequency=500
dropTime=3000
</attribute>
</gbean>
<gbean name="ClusterReceiver" class="org.apache.geronimo.tomcat.cluster.ReceiverGBean">
<attribute name="className">org.apache.catalina.tribes.transport.nio.NioReceiver</attribute>
<attribute name="initParams">address=IPAddress1
port=TCP_port1
selectorTimeout=100
maxThreads=6
</attribute>
</gbean>
<gbean name="ClusterSender" class="org.apache.geronimo.tomcat.cluster.SenderGBean">
<attribute name="className">org.apache.catalina.tribes.transport.ReplicationTransmitter</attribute>
</gbean>
<gbean name="DisableMcastInterceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
<attribute name="className">org.apache.geronimo.tomcat.interceptor.DisableMcastInterceptor</attribute>
<attribute name="initParams"/>
<reference name="NextInterceptor">
<name>TcpPingInterceptor</name>
</reference>
</gbean>
<gbean name="TcpPingInterceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
<attribute name="className">org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor</attribute>
<attribute name="initParams">Interval=60</attribute>
<reference name="NextInterceptor">
<name>TcpFailureDetector</name>
</reference>
</gbean>
<gbean name="TcpFailureDetector" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
<attribute name="className">org.apache.catalina.tribes.group.interceptors.TcpFailureDetector</attribute>
<attribute name="initParams"/>
<reference name="NextInterceptor">
<name>StaticMember1Interceptor</name>
</reference>
</gbean>
<gbean name="StaticMember1Interceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
<attribute name="className">org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor</attribute>
<attribute name="initParams"/>
<reference name="StaticMember">
<name>StaticMember2</name>
</reference>
<reference name="NextInterceptor">
<name>MessageDispatch15Interceptor</name>
</reference>
</gbean>
<gbean name="MessageDispatch15Interceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
<attribute name="className">org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor</attribute>
<attribute name="initParams"/>
<reference name="NextInterceptor">
<name>ThroughputInterceptor</name>
</reference>
</gbean>
<gbean name="ThroughputInterceptor" class="org.apache.geronimo.tomcat.cluster.ChannelInterceptorGBean">
<attribute name="className">org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor</attribute>
<attribute name="initParams"/>
</gbean>
<gbean name="StaticMember2" class="org.apache.geronimo.tomcat.cluster.StaticMemberGBean">
<attribute name="className">org.apache.catalina.tribes.membership.StaticMember</attribute>
<attribute name="initParams">port=TCP_port2
securePort=-1
host=IPAddress2
domain=test-domain
UniqueId={2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}
</attribute>
</gbean>
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