linux+nginx+tomcat负载均衡，实现session同步

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软件及环境是：
虚拟机上装centos 5.5
IP为：192.168.0.51 装上nginx和tomcat 6.0.32 命名为 Tomcat1
一台win7上装tomcat 6.0.32 IP为：192.168.0.50 命名为 Tomcat2

首先装nginx，我是参照http://blog.s135.com/nginx_php_v6/ 配了一个Nginx + PHP（FastCGI）环境，然后再加上Tomcat的转发。具体配置已略！

下一步是配置Tomcat集群。分别打开tomcat1和tomcat2下conf中server.xml
<Server port="8005" shutdown="SHUTDOWN">

<Connector port="8080" maxHttpHeaderSize="8192"
maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
connectionTimeout="20000" disableUploadTimeout="true" />

<Connector port="8009" enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />

找到<Engine name="Catalina" defaultHost="localhost">
Tomcat1下的修改为<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">
Tomcat2下的修改为<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">

tomcat1找到
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
修改为

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"

channelSendOptions="6">

<Manager className="org.apache.catalina.ha.session.DeltaManager"

expireSessionsOnShutdown="false"

notifyListenersOnReplication="true"/>

<!--

<Manager className="org.apache.catalina.ha.session.BackupManager"

expireSessionsOnShutdown="false"

notifyListenersOnReplication="true"

mapSendOptions="6"/>

-->

<Membership className="org.apache.catalina.tribes.membership.McastService"

address="228.0.0.5"

bind="192.168.0.51"

port="45564"

frequency="500"

dropTime="3000"/>

<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"

address="192.168.0.51"

autoBind="100"

port="4001"

selectorTimeout="100"

maxThreads="6"/>

</Sender>

</Channel>

</Cluster>

tomcat2找到
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
修改为

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"

channelSendOptions="6">

<Manager className="org.apache.catalina.ha.session.DeltaManager"

expireSessionsOnShutdown="false"

notifyListenersOnReplication="true"/>

<!--

<Manager className="org.apache.catalina.ha.session.BackupManager"

expireSessionsOnShutdown="false"

notifyListenersOnReplication="true"

mapSendOptions="6"/>

-->

<Membership className="org.apache.catalina.tribes.membership.McastService"

address="228.0.0.5"

bind="192.168.0.50"

port="45564"

frequency="500"

dropTime="3000"/>

<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"

address="192.168.0.50"

autoBind="100"

port="4000"

selectorTimeout="100"

maxThreads="6"/>

</Sender>

</Channel>

</Cluster>

还需要在程序的web.xml里面</web-app>前面加入以下这句话
<distributable/>
session同步到这里设置完毕

服务器的启动顺序如下:
tomcat1 --> |tomcat2 --> |nginx

先启动tocmat1,等tomcat1启动完全的时候再启动tomcat2，等两个tocmat全启动之后，再启动nginx

负载的时候可以用APACHE或NGINX，如果什么都不用，两台一接防问了话，可能会出错极session不同步的问题，网上也很多人介意不要做seeeion同步，这样会降低机器的性能，有一个方法可以，就是NGINX的ip_hash,这样至少可以保证客户端去防问同一台TOCMAT，除非那台TOCMAT挂了