tomcat集羣安裝
軟件及環境:
apache-tomcat-6.0.29
nginx-0.8.15
centos5.5
nginx:192.168.1.251
tomat1:192.168.1.251
tomat2:192.168.1.252
tomcat安裝目錄爲:/usr/local/tomcat
nginx安裝目錄爲:/usr/local/nginx
jdk、tomcat、nginx安裝過程省略！
Tomcat1配置如下:
修改<Engine name="Catalina" defaultHost="localhost">爲
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">
在Engine字段中添加下cluster內容：
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="6" defaultMode="true">
<!-- <Manager className="org.apache.catalina.ha.session.BackupManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"
mapSendOptions="6"/> -->
<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.2" <!—組播地址-->
bind="192.168.1.251" <!—綁定本機的IP-->
port="45564" <!—通信端口-->
frequency="500"
dropTime="3000"/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="192.168.1.251"
autoBind="100"
port="5001"
selectorTimeout="100"
maxThreads="6"/>
<Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
</Channel>
<Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>
<!-- <Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/> -->
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>
Tomcat2配置如下:
修改<Engine name="Catalina" defaultHost="localhost">爲:
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">
在Engine字段中添加下cluster內容：
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="6" defaultMode="true">
<!-- <Manager className="org.apache.catalina.ha.session.BackupManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"
mapSendOptions="6"/> -->
<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<Channel className="org.apache.catalina.tribes.group.GroupChannel">
<Membership className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.2"
bind="192.168.1.252"
port="45564"
frequency="500"
dropTime="3000"/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="192.168.1.252"
autoBind="100"
port="5002"
selectorTimeout="100"
maxThreads="6"/>
<Sender className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
<Interceptor className="org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor"/>
</Channel>
<Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>
<!-- <Deployer className="org.apache.catalina.ha.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/> -->
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>
配置nginx負載：
使用nginx做負載很簡單，只要在配置文件裏面加
upstream www.tomcat.com {
# ip_hash; //啓用這個的話，整個C類地址會防問同一個server
server 192.168.1.251:8080;
server 192.168.1.252:8080;
#兩臺負載的IP地址，這裏默認的是RR
}
server
{
listen 80;
server_name _;
location / {
proxy_pass http://www.tomcat.com;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
到這裏配置文件就OK了，服務器的啓動順序如下:
|-------------| |-------------| |-------------|
|tomcat1 | --à |tomcat2 | --à |nginx |
|-------------| |-------------| |-------------|
先啓動tocmat1,等tomcat1啓動完全的時候再啓動tomcat2，等兩個tocmat全啓動之後，再啓動nginx
測試一下我們的配置,測試頁如下:
<%@ page contentType="text/html; charset=GBK" %>
<%@ page import="java.util.*" %>
<html><head><title>Cluster Test</title></head>
<body>
<%
//HttpSession session = request.getSession(true);
System.out.println(session.getId());
out.println("<br> SESSION ID:" + session.getId()+"<br>");
// 如果有新的請求，則添加session屬性
String name = request.getParameter("name");
if (name != null && name.length() > 0) {
String value = request.getParameter("value");
session.setAttribute(name, value);
}
out.print("<b>Session List:</b>");
Enumeration<String> names = session.getAttributeNames();
while (names.hasMoreElements()) {
String sname = names.nextElement();
String value = session.getAttribute(sname).toString();
out.println( sname + " = " + value+"<br>");
System.out.println( sname + " = " + value);
}
%>
<form action="index.jsp" method="post">
名稱:<input type=text size=20 name="name">
<br>
值:<input type=text size=20 name="value">
<br>
<input type=submit value="提交">
</form>
</body>
</html>
配置WEB-INF下的web.xml文件，在<web-app>中加入<distributable/>
<web-app>
<distributable/>
</web-app>
然後我們就可以用nginx來防問了！
先防問，然後隨便關閉那一個，再開啓，發現SESSION都是同步的！
PS:
負載的時候可以用APACHE或NGINX，如果什麼都不用，兩臺一接防問了話，可能會出錯極session不同步的問題，網上也很多人介意不要做seeeion同步，這樣會降低機器的性能，有一個方法可以，就是NGINX的ip_hash,這樣至少可以保證客戶端去防問同一臺TOCMAT，除非那臺TOCMAT掛了！