前面我们介绍了tomcat负载均衡配置的安装过程,接下来就进入我们的重点了——tomcat负载均衡配置代码内容。当然,我们在正确安装之后才能进行到这一步。之后还包括tomacat集群配置和应用配置。相关的代码介绍的比较详细,希望对大家有所帮助。
◆tomcat负载均衡配置过程
(1)在那台要安装apache的服务器上安装apache2.0.55,我的安装路径为默认C:\Program Files\Apache Group\Apache2
(2)安装后测试apache能否正常启动,调试到能够正常启动http://192.168.0.88
(3)下载jk2.0.4后解压缩文件
(4)将解压缩后的目录中的modules目录中的mod_jk2.so文件复制到apache的安装目录下的modules目录中,我的为C:\Program Files\Apache Group\Apache2\modules
(5)修改apache的安装目录中的conf目录的配置文件httpd.conf,在文件中加LoadModule模块配置信息的最后加上一句LoadModule jk2_module modules/mod_jk2.so
(6)分别修改三个tomcat的配置文件conf/server.xml,修改内容如下
修改前
- <!-- An Engine represents the entry point (within Catalina) that processes
- every request. The Engine implementation for Tomcat stand alone
- analyzes the HTTP headers included with the request, and passes them
- on to the appropriate Host (virtual host). -->
- <!-- You should set jvmRoute to support load-balancing via AJP ie :
- <Engine name="Standalone" defaultHost="localhost" jvmRoute="jvm1">
- -->
- <!-- Define the top level container in our container hierarchy -->
- <Engine name="Catalina" defaultHost="localhost">
#p#修改后
- <!-- An Engine represents the entry point (within Catalina) that processes
- every request. The Engine implementation for Tomcat stand alone
- analyzes the HTTP headers included with the request, and passes them
- on to the appropriate Host (virtual host). -->
- <!-- You should set jvmRoute to support load-balancing via AJP ie :-->
- <Engine name="Standalone" defaultHost="localhost" jvmRoute="tomcat1">
- <!-- Define the top level container in our container hierarchy
- <Engine name="Catalina" defaultHost="localhost">
- -->
将其中的jvmRoute="jvm1"分别修改为jvmRoute="tomcat1"和jvmRoute="tomcat2"和jvmRoute="tomcat3"
(7)然后重启三个tomcat,调试能够正常启动。
(8)在apache的安装目录中的conf目录下创建文件workers2.propertie,写入文件内容如下
- # fine the communication channel
- [channel.socket:192.168.0.1:8009]
- info=Ajp13 forwarding over socket
- #配置第一个服务器
- tomcatId=tomcat1 #要和tomcat的配置文件server.xml中的jvmRoute="tomcat1"名称一致
- debug=0
- lb_factor=1 #负载平衡因子,数字越大请求被分配的几率越高
- # Define the communication channel
- [channel.socket:192.168.0.2:8009]
- info=Ajp13 forwarding over socket
- tomcatId=tomcat2
- debug=0
- lb_factor=1
- # Define the communication channel
- [channel.socket:192.168.0.4:8009]
- info=Ajp13 forwarding over socket
- tomcatId=tomcat3
- debug=0
- lb_factor=1
- [status:]
- info=Status worker, displays runtime information.
- [uri:/jkstatus.jsp]
- info=Display status information and checks the config file for changes.
- group=status:
- [uri:/*]
- info=Map the whole webapp
- debug=0
#p#(9)在三个tomcat的安装目录中的webapps建立相同的应用,我和应用目录名为TomcatDemo,在三个应用目录中建立相同 WEB-INF目录和页面index.jsp,index.jsp的页面内容如下
- <%@ 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.print("<b>Session 列表</b>");
- 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="index.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>
(10)重启apache服务器和三个tomcat服务器,到此tomcat负载均衡配置完成。测试负载均衡先测试apache,访问http://192.168.0.88/jkstatus.jsp
能否正常访问,并查询其中的内容,有三个tomcat的相关配置信息和负载说明,访问http://192.168.0.88/TomcatDemo/index.jsp看能够运行,能运行,则已建立负载均衡。