（转）Apache2 + Tomcat6配置负载均衡
 
1. 安装Apache和Tomcat，这里假定Apache2.2.3，Tomcat6.x；且Apache安装在apachehost，tomcat分别安装在tomcathost1和tomcathost2上；
2. 修改/etc/hosts文件，确定以下行没有被注释掉
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LoadModule proxy_module modules/mod_proxy.so  
LoadModule proxy_http_module modules/mod_proxy_http.so  
LoadModule proxy_ajp_module modules/mod_proxy_ajp.so 
  LoadModule proxy_module modules/mod_proxy.so
  LoadModule proxy_http_module modules/mod_proxy_http.so
  LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
3. 修改/etc/hosts文件，添加以下行：
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ProxyRequests off  
<Proxy balancer://tccluster> 
    BalancerMember http://tomcathost1:8080 loadfactor=2 max=150 smax=145 
    BalancerMember http://tomcathost2:8080 loadfactor=1 max=150 smax=145 
    Order Deny,Allow  
    Allow from all  
</Proxy> 
<Location /balancer-manager> 
    SetHandler balancer-manager  
    Order Deny,Allow  
    Allow from all  
</Location> 
<Location /examples> 
    ProxyPass balancer://tccluster/examples stickysession=jsessionid 
    ProxyPassReverse balancer://tccluster/examples  
    Order Deny,Allow  
    Allow from all  
</Location> 
  ProxyRequests off
  <Proxy balancer://tccluster>
      BalancerMember http://tomcathost1:8080 loadfactor=2 max=150 smax=145
      BalancerMember http://tomcathost2:8080 loadfactor=1 max=150 smax=145
      Order Deny,Allow
      Allow from all
  </Proxy>
  <Location /balancer-manager>
      SetHandler balancer-manager
      Order Deny,Allow
      Allow from all
  </Location>
  <Location /examples>
      ProxyPass balancer://tccluster/examples stickysession=jsessionid
      ProxyPassReverse balancer://tccluster/examples
      Order Deny,Allow
      Allow from all
  </Location>
4. 确定apachehost和两台tomcathost可以互访，并且两个tomcat机器在一个网段内；
5. 确定两台tomcat host多播已经打开，在Linux机器上可以使用cat /proc/net/dev_mcast检查，如果文件存在基本上就是打开了；另外确定两台tomcat机器的/etc/hosts文件中包含“xxx.xxx.xxx.xxx    hostname”比如“172.17.1.101    tomcathost1”或“172.17.1.102    tomcathost2”；
6. 修改两个tomcat的conf/server.xml文件，对Engine节点分别添加jvmRoute="tomcat1"和jvmRoute="tomcat2"，并添加以下内容：
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<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=