（转）Apache2 + Tomcat6配备负载均衡

（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=