Tomcat6集群

所需软件：
Apache2.2：http://archive.apache.org/dist/httpd/binaries/win32/
tomcat-connectors-1.2.37:http://apache.etoak.com/tomcat/tomcat-connectors/jk/source/jk-1.2.28/tomcat-connectors-1.2.28-src.zip
JK2 1.2：http://labs.xiaonei.com/apache-mirror/tomcat/tomcat-connectors/jk/binaries/

端口设置
Apache 80
Tomcat1 8005 8080 8443 8009
Tomcat2 8006 8081 8444 8010

1.解压jk2将mod_jk.so放在Apache2.2\modules目录下
2.配置apache
打开httpd.conf对应位置添加
LoadModule jk_module modules/mod_jk.so
JkWorkersFile  conf/workers.properties
JkMountFile   conf/urimap.properties

增加配置文件workers.properties
在apache目录conf创建两个文件workers.properties，内容如下
worker.list=router    #配置请求处理server  这里可以配置多个server
参考：http://wenku.baidu.com/view/5a135db91a37f111f1855b7a.html
# Define the LB worker
worker.router.type=lb
worker.router.balance_workers=tomcat1,tomcat2    #指定分担请求的server列表，用逗号分隔
#设置用于负载均衡的server的session可否共享这里如果设置为0在复制session的时候tomcat会报错，但可以进行复制，如果设置为1就没有错误
worker.router.sticky_session=1

# Define 1 real tomcat using ajp13
worker.tomcat1.type=ajp13
worker.tomcat1.host=localhost
worker.tomcat1.port=8009
worker.tomcat1.lbfactor=1

# Define another tomcat using ajp13
worker.tomcat2.type=ajp13
worker.tomcat2.host=localhost
worker.tomcat2.port=8010
worker.tomcat2.lbfactor=1

增加配置文件urimap.properties
在apache目录conf创建两个文件workers.properties，内容如下
/*.jsp=router        #表示所有的jsp文件都由router这个server处理
/*/servlet/*=router
/cluster/*=router
!/*.gif=router                   #所有以.gif结尾的请求都不由controller这个server处理
这里的"!”类似于java中的"!”，是“非”的意思
把tomcat应用程序的访问URI匹配到jk2的工作条目router。

3.Tomcat1配置
1 修改配置文件server.xml
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">
jvmRoute值要与workers.properties文件中定义的条目worker.tomcat1保持一致。

4.Tomcat2配置
1 修改配置文件server.xml
<Server port="8006" shutdown="SHUTDOWN">
    <Connector port="8081" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8444" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" />
    <Connector port="8010"
               enableLookups="false" redirectPort="8444" protocol="AJP/1.3" />
上面标注红色的端口值不能与Tomcat1相同，在同一个IP环境中需要保持唯一。
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">
jvmRoute值要与workers.properties文件中定义的条目worker.tomcat2保持一致。

5.session复制配置
还是在tomcat的server.xml中
engine节点下添加

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" channelSendOptions="6">
	 <Manager className="org.apache.catalina.ha.session.BackupManager"
	  expireSessionsOnShutdown="false"
	  notifyListenersOnReplication="true"
	  mapSendOptions="6"/>
	 <!--有人说DeltaManager稳定性高于BackupManager具体不清楚
	 <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="228.0.0.4"
		   port="45564"
		   frequency="500"
		   dropTime="3000"/>
		  <Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
		   address="auto"
		   port="5001"
		   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=""/>
	  <Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
	  
	 <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.JvmRouteSessionIDBinderListener"/>
	 <ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
	</Cluster> 

最终要的一个
在web项目的web.xml中添加<distributable/>不添加就不会去复制session

最后测试：
建web项目在index.jsp中内容：

<body>
  	<center>
  	<h1>
  	<%
  	session.setAttribute("username","xiaomei");
  	out.println("</hr>");
  	out.println("session attribute:"+session.getAttribute("username"));
  	out.println("SessionId:"+session.getId());
  	out.println("</hr>");
  	%>
  	</h1>
  	<a href="other.jsp">跳转</a>
  	
  	</center>
  </body>

orther.jsp中取出存在session中的username值，看是否有值显示

正确显示为：
session attribute:xiaomei
SessionId:8C0113C471EF5ED1989CAFCC4CC81807.tomcat1

然后down掉当前tomcat点击跳转，看是否会显示：
session attribute:xiaomei
SessionId:8C0113C471EF5ED1989CAFCC4CC81807.tomcat2
则配置成功！

附上tomcat-connectors-1.2.37-src\conf\workers.properties

# 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 that the distributed version of this file requires modification
# before it is usable.
#
# Reference documentation: http://tomcat.apache.org/connectors-doc/reference/workers.html
#
# As a general note, the characters $( and ) are used internally to define
# macros. Do not use them in your own configuration!!!
#
# Whenever you see a set of lines such as:
# x=value
# y=$(x)\something
#
# the final value for y will be value\something

# Define two status worker:
# - jk-status for read-only use
# - jk-manager for read/write use
worker.list=jk-status
worker.jk-status.type=status
worker.jk-status.read_only=true

worker.list=jk-manager
worker.jk-manager.type=status

# We define a load balancer worker
# with name "balancer"
worker.list=balancer
worker.balancer.type=lb
# error_escalation_time: seconds, default = recover_time/2 (=30)
# Determines, how fast a detected error should switch from
# local error state to global error state
# Since: 1.2.28
worker.balancer.error_escalation_time=0

# - max_reply_timeouts: number, default=0
#   If there are to many reply timeouts, a worker
#   is put into the error state, i.e. it will become
#   unavailable for all sessions residing on the respective
#   Tomcat. The number of tolerated reply timeouts is
#   configured with max_reply_timeouts. The number of
#   timeouts occuring is divided by 2 once a minute and the
#   resulting counter is compared against max_reply_timeouts.
#   If you set max_reply_timeouts to N and the errors are
#   occuring equally distributed over time, you will
#   tolerate N/2 errors per minute. If they occur in a burst
#   you will tolerate N errors.
#   Since: 1.2.24
worker.balancer.max_reply_timeouts=10



# Now we add members to the load balancer
# First member is "node1", most
# attributes are inherited from the
# template "worker.template".
worker.balancer.balance_workers=node1
worker.node1.reference=worker.template
worker.node1.host=localhost
worker.node1.port=8109
# Activation allows to configure
# whether this node should actually be used
# A: active (use node fully)
# D: disabled (only use, if sticky session needs this node)
# S: stopped (do not use)
#   Since: 1.2.19
worker.node1.activation=A

# Second member is "node2", most
# attributes are inherited from the
# template "worker.template".
worker.balancer.balance_workers=node2
worker.node2.reference=worker.template
worker.node2.host=localhost
worker.node2.port=8209
# Activation allows to configure
# whether this node should actually be used
# A: active (use node fully)
# D: disabled (only use, if sticky session needs this node)
# S: stopped (do not use)
#   Since: 1.2.19
worker.node2.activation=A

# Finally we put the parameters
# which should apply to all our ajp13
# workers into the referenced template
# - Type is ajp13
worker.template.type=ajp13

# - socket_connect_timeout: milliseconds, default=0
#   Since: 1.2.27
worker.template.socket_connect_timeout=5000

# - socket_keepalive: boolean, default=false
#   Should we send TCP keepalive packets
#   when connection is idle (socket option)?
worker.template.socket_keepalive=true

# - ping_mode: Character, default=none
#   When should we use cping/cpong connection probing?
#   C = directly after establishing a new connection
#   P = directly before sending each request
#   I = in regular intervals for idle connections
#       using the watchdog thread
#   A = all of the above
#   Since: 1.2.27
worker.template.ping_mode=A

# - ping_timeout: milliseconds, default=10000
#   Wait timeout for cpong after cping
#   Can be overwritten for modes C and P
#   Using connect_timeout and prepost_timeout.
#   Since: 1.2.27
worker.template.ping_timeout=10000

# - connection_pool_minsize: number, default=connection_pool_size
#   Lower pool size when shrinking pool due
#   to idle connections
#   We want all connections to be closed when
#   idle for a long time in order to prevent
#   firewall problems.
#   Since: 1.2.16
worker.template.connection_pool_minsize=0

# - connection_pool_timeout: seconds, default=0
#   Idle time, before a connection is eligible
#   for being closed (pool shrinking).
#   This should be the same value as connectionTimeout
#   in the Tomcat AJP connector, but there it is
#   milliseconds, here seconds.
worker.template.connection_pool_timeout=600

# - reply_timeout: milliseconds, default=0
#   Any pause longer than this timeout during waiting
#   for a part of the reply will abort handling the request
#   in mod_jk. The request will proceed running in
#   Tomcat, but the web server resources will be freed
#   and an error is send to the client.
#   For individual requests, the timeout can be overwritten
#   by the Apache environment variable JK_REPLY_TIMEOUT.
#   JK_REPLY_TIMEOUT since: 1.2.27
worker.template.reply_timeout=300000

# - recovery_options: number, default=0
#   Bit mask to configure, if a request, which was send
#   to a backend successfully, should be retried on another backend
#   in case there's a problem with the response.
#   Value "3" disables retries, whenever a part of the request was
#   successfully send to the backend.
worker.template.recovery_options=3