一 所屬軟件
1 個Apache
1 個JDK
2 個Tomcat
二 負載均衡
負載均衡,就是apache將客戶請求均衡的分給tomcat1,tomcat2....去處理
1. 修改workers.properties
worker.list = work1,tomcat1,tomcat2
#========tomcat1========
worker.tomcat1.port=8009 #ajp13 端口號,在tomcat下server.xml配置,默認8009
worker.tomcat1.host=localhost #tomcat的主機地址,如不爲本機,請填寫ip地址
worker.tomcat1.type=ajp13
worker.tomcat1.lbfactor = 1 #server的加權比重,值越高,分得的請求越多
#========tomcat2========
worker.tomcat2.port=9009
worker.tomcat2.host=localhost
worker.tomcat2.type=ajp13
worker.tomcat2.lbfactor = 1
#========work1==========
worker.work1.type=lb
worker.work1.balanced_workers=tomcat1,tomcat2 #指定分擔請求的tomcat
worker.work1.sticky_session=1
2. 修改tomcat配置文件server.xml
如果你在不同電腦上安裝tomcat,tomcat的安裝數量爲一個,可以不必修改tomcat配置文件
我這裏是在同一臺電腦上安裝兩個tomcat,所以需要更改其中一個的設置
<Server port="8005" shutdown="SHUTDOWN"> //9005
<Connector port="8080" //9080
<Connector port="8009" //9009
<Connector port="8082" //9082
3. 測試一下
編寫一個測試jsp建立一個目錄test.裏面新建一個test.jsp,內容爲
<%
System.out.println("===========================");
%>
分別開兩個窗口運行
# /java/tomcat1/bin/catalina.sh run
# /java/tomcat2/bin/catalina.sh run
然後運行apache
訪問test.jsp,刷新你會發現每刷新一次其中一個tomcat處理一次
三 配置集羣
只配置負載均衡還不行,還要session複製,也就是說其中任何一個tomcat的添加的session,是要同步複製到其它tomcat,集羣內的tomcat都有相同的session
1. 修改tomcat1, tomcat2的server.xml,將集羣部分配置的在註釋符刪掉,並將tomcat2的4001端口改爲4002,以避免與tomcat衝突,
當然,如果是兩臺電腦,是不用改端口的,去掉註釋符即可
即:<Cluster ... </Cluster>
2. 增加jvmRoute tomcat1、tomcat2都需要設置
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">
3. 測試頁面
修改test.jsp,內容如下
<%@ page contentType="text/html; charset=utf-8" %>
<%@ 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 屬性設置
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">
名稱:<input type=text size=20 name="dataName">
<br>
值:<input type=text size=20 name="dataValue">
<br>
<input type=submit>
</form>
</body>