分别下载

tomcat http://archive.apache.org/dist/tomcat/tomcat-7/v7.0.22/bin/apache-tomcat-7.0.22.tar.gz

nginx http://nginx.org/download/nginx-1.1.14.tar.gz

 

准备两个虚拟机:

server1 192.168.1.112

server2 192.168.1.64

 

Tomcat直接解压,运行,使用默认的8080端口

tar zxvf apache-tomcat-7.0.22.tar.gz
cd apache-tomcat-7.0.22/bin
./startup.sh

访问http://192.168.1.112:8080和http://192.168.1.64:8080出现Tomcat首页即可

 

接下来安装nginx, nginx我就直接安装在server1上

nginx_upstream_jvm_route是一个Nginx的扩展模块,用来实现基于Cookie的SessionSticky的功能, 去SVN下载最新版

svn checkout http://nginx-upstream-jvm-route.googlecode.com/svn/trunk/ /root/dev/nginx-upstream-jvm-route-read-only

解压nginx

tar zxvf nginx-1.1.14.tar.gz

cd nginx-1.1.14

 运行

patch -p0 < /root/dev/nginx-upstream-jvm-route-read-only/jvm_route.patch
./configure --prefix=/etc/nginx --with-http_stub_status_module --add-module=/root/dev/nginx-upstream-jvm-route-read-only/
make
make install

在nginx安装目录下的conf/目录新建一个文件proxy.conf(/etc/nginx/conf/proxy.conf), 内容如下:

proxy_redirect          off; 
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 10m;
client_body_buffer_size 128k;
proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;
proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;

修改nginx配置文件/etc/nginx/conf/nginx.conf

完整配置如下

http {
include mime.types;

#反向代理配置
include proxy.conf;

default_type application/octet-stream;
sendfile on;
    keepalive_timeout  65;

upstream server1{
server 192.168.1.112:8080 srun_id=tomcat1;
server 192.168.1.64:8080 srun_id=tomcat2;
jvm_route $cookie_JSESSIONID|sessionid reverse;
}

server {
listen 80;
server_name localhost;
access_log /var/log/nginx/access.log;

location ~ ^/NginxStatus/ {
stub_status on; #Nginx 状态监控配置
access_log off;
}

location ~ ^/(WEB-INF)/ {
deny all;
}

location / {
root html;
index index.html index.htm;
proxy_pass http://server1;
}

location /doc {
root /usr/share;
autoindex on;
allow 127.0.0.1;
deny all;
}

location /images {
root /usr/share;
autoindex on;
}

具体配置说明请参考《轻量级WEB服务器Nginx》

然后运行nginx

/etc/nginx/sbin/nginx

访问http://192.168.1.112/NginxStatus,可以看到nginx状态

然后修改tomcat配置文件, 打开apache-tomcat-7.0.22/conf/server.xml, 找到最下面的<Engine name="Catalina" defaultHost="localhost">节点, 修改为

server1

<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat1">

并插入如下配置

<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster" 
channelSendOptions
="8">
<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
="224.0.0.4"
port
="45564"
frequency
="500"
dropTime
="3000"/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address
="192.168.1.112"
port
="4000"
autoBind
="100"
selectorTimeout
="5000"
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
=""/>
<Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
<ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>

server2

...
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcat2">
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions
="8">
<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
="224.0.0.4"
port
="45564"
frequency
="500"
dropTime
="3000"/>
<Receiver className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address
="192.168.1.64"
port
="4000"
autoBind
="100"
selectorTimeout
="5000"
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
=""/>
<Valve className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
<ClusterListener className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
<ClusterListener className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>
...

 

jvmRoute="tomcat1"和nginx配置upstream中的srun_id对应
membership中的address=224.0.0.4为组播IP,集群中的tomcat通信之用
receiver中的address设为本机IP,或auto,如果多个Tomcat在同一台电脑上,则要保证port端口不重复

在两个tomcat的webapps目录下分别新建一个项目test,

/test

/test/index.jsp

/test/WEB-INF/

/test/WEB-INF/web.xml

index.jsp内容

<%@ page language="java" contentType="text/html; charset=UTF-8"

pageEncoding
="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<%=session.getId() %><br>
<%

String msg = (String)session.getAttribute("msg");

if(null == msg){

session.setAttribute(
"msg", "Hello!");

}
else{

session.setAttribute(
"msg", msg + 0);

}

%>

<%=session.getAttribute("msg") %>

</body>

</html>


web.xml

<?xml version="1.0" encoding="UTF-8"?>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<distributable/>

</web-app>

注意上面的distributable节点,表示该应用是在集群环境下的。

 

重启tomcat后在两台机子上访问http://192.168.1.112/test

从SessionId后面带的服务器名可以看到负载均衡的效果。

然后将server1上的tomcat停掉,再刷新页面,可以看到原来访问server1的页面成功地切换到了server2,而sessionId没有变,session中的msg也和原来一样。

 

 

 



 

 

 

 posted on 2012-02-08 21:25  ﹎敏ō  阅读(3469)  评论(0编辑  收藏  举报