apache tomcat负载均衡实验记录
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http://www.iteye.com/topic/1017961
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准备工作
Tomcat7?http://tomcat.apache.org/download-70.cgi
apache httpd server 2.2:?http://httpd.apache.org/download.cgi
apache tomcat connector:?http://archive.apache.org/dist/tomcat/tomcat-connectors/jk/binaries/win32/jk-1.2.31/
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相关文档：
web server how to:
http://tomcat.apache.org/connectors-doc/webserver_howto/apache.html
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安装路径：
httpd: ? ? ? ? ? ? D:\Server\Apache httpd2_2
tomcatD:\Server\tomcat7-1 tomcat7-2 tomcat7-3
JK?D:\Server\Apache httpd2_2\modules\mod_jk-1.2.31-httpd-2.2.3.so
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step 1: 添加并配置JK
D:\Server\Apache httpd2_2\conf\httpd.conf文件最后加上，意思是把这个配置加载进来
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include conf\mod_jk.conf
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LoadModule jk_module modules/mod_jk-1.2.31-httpd-2.2.3.soJkWorkersFile conf/workers.properties#指定那些请求交给tomcat处理,"controller"为在workers.propertise里指定的负载分配控制器名JkMount /*.jsp controller?
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Step 2: 配置worker
#serverworker.list = controller#========tomcat1========worker.tomcat1.port=11009worker.tomcat1.host=localhostworker.tomcat1.type=ajp13worker.tomcat1.lbfactor = 1#========tomcat2========worker.tomcat2.port=12009worker.tomcat2.host=localhostworker.tomcat2.type=ajp13worker.tomcat2.lbfactor = 1#========tomcat3========worker.tomcat3.port=13009worker.tomcat3.host=192.168.0.80 //在我的虚拟机中的，可以算远程的吧worker.tomcat3.type=ajp13worker.tomcat3.lbfactor = 1 #========controller,负载均衡控制器========worker.controller.type=lbworker.controller.balanced_workers=tomcat1,tomcat2,tomcat3worker.controller.sticky_session=falseworker.controller.sticky_session_force=1#worker.controller.sticky_session=1
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如果三个tomcat不在同一台机器上，那么下面改端口的事情就可以省很多力气，不过因为要单机做负载均衡，所以要更改三个tomcat的8005,8080的端口，确保都不一样，不然tomcat是没办法同时启动三个的。
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测试的时候我三个tomcat都放在本地,因为要同时启动三个tomcat,所以需要更改三个tomcat中的Connector端口号，将三个tomcat的的protocol="HTTP/1.1" 的connector的port改为10080,11080,12080。(原来是8080)
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同时讲原来8005的端口分别改成10005,11005,12005(这个是关闭tomcat的端口号)
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tomcat7-1
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<Connector port="10080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />?
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tomcat7-2
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<Connector port="11080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />?
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tomcat7-3
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<Connector port="12080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" />?
除了更改server.xml中 原来的8080的端口（protocol="HTTP/1.1" 的端口号）
还需要配置AJP13的端口号，同时打开默认注释掉的<Cluster>标签，对应的<Engine>的jvmRoute改成workers.property里面对应的名字，配置如下（删除了注释）
tomcat7-1
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<Connector port="11009" protocol="AJP/1.3" redirectPort="8443" /> <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1"> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>?
tomcat7-2
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<Connector port="12009" protocol="AJP/1.3" redirectPort="8443" /> <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2"> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>?
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tomcat7-3
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<Connector port="13009" protocol="AJP/1.3" redirectPort="8443" /> <Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat3"> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>?
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OK,这时候可以成功启动三个tomcat7了，当tomcat7-2启动后，tomcat7-1会打印出replication的信息
类似于
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2011-9-20 14:12:18 org.apache.catalina.ha.tcp.SimpleTcpCluster memberAdded信息: Replication member added:org.apache.catalina.tribes.membership.MemberImpl[tcp://{172, 16, 10, 96}:4001,{172, 16, 10, 96},4001, alive=1000, securePort=-1, UDP Port=-1, id={109 112 -14 -8 -44 98 79 85 -89 -48 -33 -127 -47 -3026 -75 }, payload={}, command={}, domain={}, ]??
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<%@ page contentType="text/html; charset=GBK"%><%@ page import="java.util.*"%><html><head><title>Cluster App Test</title></head><body>Server Info:<%out.println(request.getLocalAddr() + " : " + request.getLocalPort() + "<br>");%><%out.println("<br> ID " + session.getId() + "<br>");// 如果有新的 Session 属性设置String dataName = request.getParameter("dataName");if (dataName != null && dataName.length() > 0) {String dataValue = request.getParameter("dataValue");session.setAttribute(dataName, dataValue);}out.println("<b>Session 列表</b><br>");System.out.println("============================");Enumeration e = session.getAttributeNames();while (e.hasMoreElements()) {String name = (String) e.nextElement();String value = session.getAttribute(name).toString();out.println(name + " = " + value + "<br>");System.out.println(name + " = " + value);}%><form action="testlb.jsp" method="POST">名称:<input type=text size=20 name="dataName"><br>值:<input type=text size=20 name="dataValue"><br><input type=submit></form></body></html>?
多次刷新页面的sessionID看是同一个ID，说明session是复制成功了。那么session中的存储的东西呢，在输入框中分别输入1、1，2、2，3、3后，显示结果如下图：?
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