tomcat session cluster

tomcat 的session cluster是为了应对session的保持和统一，常见的有四种：

• 一种是标准会话管理(StandardManager)，但是只能保持一段时间；
• 持久会话管理(PersistentManager)，这种方式可以将会话保持在file中，也可以调用保存在数据库(JBDCStore)的某个表中，但是这种表只能自己用不能共享给其他session主机，然而，这一段代码看着好眼熟，原来是背后就是体现JBDCStore的一段功能：

<Manager className=”org.apache.catalina.session.PersistentManager”
saveOnRestart=”true”>
<Store className=”org.apache.catalina.session.JDBCStore”
driverName=”com.mysql.jdbc.Driver”
connectionURL=”jdbc:mysql://localhost:3306/mydb?user=jb;password=pw”/>    //连接至具体的数据库里面的哪个表，看着很眼熟吧。。。
</Manager>

• Delta会话管理，是session集群管理的一种方式，无论是哪台session有了更新都会多播通知其他所有节点，其他节点都会跟着更新，所以不适合规模的集群，在不断电的状况下确实能保持优越的故障转移能力
• BackupManager，者种会话集群方式与Delta有所不同，它可以指定每台session server的同步节点，不用在全网同步

host3：

cat /etc/tomcat/server.xml
<?xml version=’1.0′ encoding=’utf-8′?>
<!–
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements.  See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the “License”); you may not use this file except in compliance with
the License.  You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
–>
<!– Note:  A “Server” is not itself a “Container”, so you may not
define subcomponents such as “Valves” at this level.
Documentation at /docs/config/server.html
–>
<Server port=”8005″ shutdown=”SHUTDOWN”>
<!– Security listener. Documentation at /docs/config/listeners.html
<Listener className=”org.apache.catalina.security.SecurityListener” />
–>
<!–APR library loader. Documentation at /docs/apr.html –>
<Listener className=”org.apache.catalina.core.AprLifecycleListener” SSLEngine=”on” />
<!–Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html –>
<Listener className=”org.apache.catalina.core.JasperListener” />
<!– Prevent memory leaks due to use of particular java/javax APIs–>
<Listener className=”org.apache.catalina.core.JreMemoryLeakPreventionListener” />
<Listener className=”org.apache.catalina.mbeans.GlobalResourcesLifecycleListener” />
<Listener className=”org.apache.catalina.core.ThreadLocalLeakPreventionListener” />

<!– Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
–>
<GlobalNamingResources>
<!– Editable user database that can also be used by
UserDatabaseRealm to authenticate users
–>
<Resource name=”UserDatabase” auth=”Container”
type=”org.apache.catalina.UserDatabase”
description=”User database that can be updated and saved”
factory=”org.apache.catalina.users.MemoryUserDatabaseFactory”
pathname=”conf/tomcat-users.xml” />
</GlobalNamingResources>

<!– A “Service” is a collection of one or more “Connectors” that share
a single “Container” Note:  A “Service” is not itself a “Container”,
so you may not define subcomponents such as “Valves” at this level.
Documentation at /docs/config/service.html
–>
<Service name=”Catalina”>

<!–The connectors can use a shared executor, you can define one or more named thread pools–>
<!–
<Executor name=”tomcatThreadPool” namePrefix=”catalina-exec-”
maxThreads=”150″ minSpareThreads=”4″/>
–>

<!– A “Connector” represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
Java AJP  Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL HTTP/1.1 Connector on port 8080
–>
<Connector port=”8080″ protocol=”HTTP/1.1″
connectionTimeout=”20000″
redirectPort=”8443″ />
<!– A “Connector” using the shared thread pool–>
<!–
<Connector executor=”tomcatThreadPool”
port=”8080″ protocol=”HTTP/1.1″
connectionTimeout=”20000″
redirectPort=”8443″ />
–>
<!– Define a SSL HTTP/1.1 Connector on port 8443
This connector uses the BIO implementation that requires the JSSE
style configuration. When using the APR/native implementation, the
OpenSSL style configuration is required as described in the APR/native
documentation –>
<!–
<Connector port=”8443″ protocol=”org.apache.coyote.http11.Http11Protocol”
maxThreads=”150″ SSLEnabled=”true” scheme=”https” secure=”true”
clientAuth=”false” sslProtocol=”TLS” />
–>

<!– Define an AJP 1.3 Connector on port 8009 –>
<Connector port=”8009″ protocol=”AJP/1.3″ redirectPort=”8443″ />

<!– An Engine represents the entry point (within Catalina) that processes
every request.  The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html –>

<!– You should set jvmRoute to support load-balancing via AJP ie :
<Engine name=”Catalina” defaultHost=”localhost” jvmRoute=”jvm1″>
–>
<Engine name=”Catalina” defaultHost=”www.b2.com” jvmRoute=”Tomcat2″>

<!–For clustering, please take a look at documentation at:
/docs/cluster-howto.html  (simple how to)
/docs/config/cluster.html (reference documentation) –>
<!–
<Cluster className=”org.apache.catalina.ha.tcp.SimpleTcpCluster”/>
–>

<!– Use the LockOutRealm to prevent attempts to guess user passwords
via a brute-force attack –>
<Realm className=”org.apache.catalina.realm.LockOutRealm”>
<!– This Realm uses the UserDatabase configured in the global JNDI
resources under the key “UserDatabase”.  Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm.  –>
<Realm className=”org.apache.catalina.realm.UserDatabaseRealm”
resourceName=”UserDatabase”/>
</Realm>

<Host name=”localhost”  appBase=”webapps”
unpackWARs=”true” autoDeploy=”true”>

<!– SingleSignOn valve, share authentication between web applications
Documentation at: /docs/config/valve.html –>
<!–
<Valve className=”org.apache.catalina.authenticator.SingleSignOn” />
–>

<!– Access log processes all example.
Documentation at: /docs/config/valve.html
Note: The pattern used is equivalent to using pattern=”common” –>
<Valve className=”org.apache.catalina.valves.AccessLogValve” directory=”logs”
prefix=”localhost_access_log.” suffix=”.txt”
pattern=”%h %l %u %t &quot;%r&quot; %s %b” />

</Host>
<Host name=”www.b2.com” appBase=”webapps”>
<Cluster className=”org.apache.catalina.ha.tcp.SimpleTcpCluster”
channelSendOptions=”6″>

<!–  <Manager className=”org.apache.catalina.ha.session.BackupManager”
expireSessionsOnShutdown=”false”
notifyListenersOnReplication=”true”
mapSendOptions=”6″/>
–>
<Manager className=”org.apache.catalina.ha.session.DeltaManager”
expireSessionsOnShutdown=”false”
notifyListenersOnReplication=”true”/>

<Channel className=”org.apache.catalina.tribes.group.GroupChannel”>
<Membership className=”org.apache.catalina.tribes.membership.McastService”
address=”228.0.2.4″
port=”45564″
frequency=”500″
dropTime=”3000″/>
<Receiver className=”org.apache.catalina.tribes.transport.nio.NioReceiver”
address=”172.16.52.60″
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|.*\.jpeg|.*\.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>
<Context path=”” docBase=”myapp”>
</Context>
</Host>
</Engine>
</Service>
</Server>

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