apache与tomcat负载集群的3种方法 （转载）要实现session复制，还需要在context.xml添加属性distributablet
apache与tomcat负载集群的3种方法 （转载）
要实现session复制，还需要在context.xml添加属性distributable="true"，如下：
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><Context?distributable="true">
如果不想在context.xml中添加distributable="true"，还有另一方法是在应用程序的web.xml中添加<distributeable/>，不过这方法我没有测试。
配置完成，访问地址为：http://127.0.0.1:8079
另一个tomcat.worker3的配置
server.xml
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><Connector?port="8078"?protocol="HTTP/1.1"?connectionTimeout="20000"?redirectPort="8443"?/>
<Connector?port="9009"?protocol="AJP/1.3"?redirectPort="8443"?/>
<Engine?name="Catalina"?defaultHost="localhost"?jvmRoute="worker3">
???<Cluster?className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
context.xml配置tomcat.worker2一样。
配置完成，访问地址为：http://127.0.0.1:8078
注意：如果两个tomcat是放在同一台机内，server.xml可能还需要修改其它端口，请确认两个tomcat能正常启动。
在tomcat.worker2和tomcat.worker3的webapps文件夹添加同样的测试文件test"test.jsp
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><html>
<head>
??<title>helloapp</title>
</head>
<body>
<%
System.out.println("call?test.jsp");
%>???
SessionID:?<%=session.getId()?%>??
</body>
</html>
访问http://127.0.0.1:8078/test/test.jsp和http://127.0.0.1:8079/test/test.jsp，确保能成功访问。
现在开始apache和tomcat的不同方式集成
1、jk方式集成
下载mod_jk-1.2.31-httpd-2.2.3.so,请下载合适的mod_jk版本，改名为mod_jk.so放进modules文件夹内
修改conf/httpd.conf配置
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->LoadModule?jk_module?modules/mod_jk.so
JkWorkersFile?conf/workers.properties
JkLogFile?logs/mod_jk.log
JkLogLevel?debug
JkMount??/*.do?loadbalancer
JkMount??/*.jsp?loadbalancer
增加conf/workers.properties文件，添加内容
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->worker.list=loadbalancer
worker.worker2.port=8077???#ajp的监听端口
worker.worker2.host=108.88.3.105
worker.worker2.type=ajp13
worker.worker2.lbfactor=1
worker.worker3.port=9009
worker.worker3.host=127.0.0.1
worker.worker3.type=ajp13
worker.worker3.lbfactor=1
worker.loadbalancer.type=lb
worker.loadbalancer.balance_workers=worker2,worker3?#这里在的worker2、worker3为需要与上边tomcat设置的别名一致
worker.loadbalancer.sticky_session=1
配置完成任务，访问http://127.0.0.1:8081/test/test.jsp，检查是否能正常访问。
2、ajp_proxy
去掉httpd.conf文件中下面内容的注释(删掉#号)，开启下边的配置
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->Include?conf/extra/httpd-vhosts.conf
LoadModule?proxy_module?modules/mod_proxy.so
LoadModule?proxy_ajp_module?modules/mod_proxy_ajp.so
LoadModule?proxy_balancer_module?modules/mod_proxy_balancer.so
LoadModule?proxy_connect_module?modules/mod_proxy_connect.so
LoadModule?proxy_ftp_module?modules/mod_proxy_ftp.so
LoadModule?proxy_http_module?modules/mod_proxy_http.so
注意:
除了mod_proxy.so，mod_proxy_balancer.so，mod_proxy_connect.so
如果是采用ajp_proxy，需要加载mod_proxy_ajp.so这个模块；
如果是采用http_proxy，需要加载mod_proxy_http.so这个模块；
httpd.conf,删除刚才jk方式的配置内容，增加下边的配置
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->ProxyRequests?Off
<proxy?balancer://loadbalancer>?
BalancerMember?ajp://127.0.0.1:9009?loadfactor=1?route=worker3
BalancerMember?ajp://108.88.3.105:8077?loadfactor=1?route=worker2
</proxy>
conf/extra/httpd-vhosts.conf增加配置
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> --><VirtualHost?*:8081>
?????????ServerAdmin?xxxx@xxx.com
?????????ServerName?localhost
?????????ServerAlias?localhost
?????????ProxyPass?/?balancer://loadbalancer/?stickysession=jsessionid?nofailover=On
?????????ProxyPassReverse?/?balancer://loadbalancer/
?????????ErrorLog?"logs/loadbalancer-error.log"
?????????CustomLog?"logs/loadbalancer-access.log"?common
</VirtualHost>
配置完成任务，访问http://127.0.0.1:8081/test/test.jsp，检查是否能正常访问。
3、http_proxy
http_proxy的配置与ajp_proxy类似，修改方法2的httpd.conf配置如下，其它不变
<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->ProxyRequests?Off
<proxy?balancer://loadbalancer>?
BalancerMember?http://127.0.0.1:8078?loadfactor=1?route=worker3
BalancerMember?http://108.88.3.105:8079?loadfactor=1?route=worker2
</proxy>
配置完成任务，访问http://127.0.0.1:8081/test/test.jsp，检查是否能正常访问。
apache_tomcat配置文件下载:apache_tomcat
