Nginx+Tomcat+Memcached负载均衡和session共享

Posted 2020-10-25 迢迢

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1. 演示搭建

说明：本文参考网络日志http://blog.csdn.net/remote_roamer/article/details/51133790，结合实际操作，仅做个演示记录。

1.1. 工具

1、Tomcat两个

2、Memcached

3、nginx

如图：

1.2. 结果演示

1、打开浏览器访问http://localhost:8080/index.jsp

1.3. 配置

1.3.1. 安装Nginx

1、准备nginx，解压即可

2、配置打开nginx目录下的conf/nginx.conf文件，替换复制如下内容到文件中。

 1 worker_processes  1;
 2   
 3 events {  
 4 worker_connections  1024;
 5 }  
 6   
 7 http {  
 8     include       mime.types;
 9     default_type  application/octet-stream;
10     sendfile        on;
11     keepalive_timeout  65; 
12     gzip  on; 
13     upstream  clusterApp.com {
14         server    127.0.0.1:18080  weight=1;
15         server    127.0.0.1:28080  weight=2;
16     }     
17   
18     server {  
19         listen       8080;
20         server_name  localhost;
21         location / {  
22             proxy_pass http://clusterApp.com;
23             proxy_redirect default;
24         }  
25         error_page   500 502 503 504  /50x.html;
26         location = /50x.html {  
27             root   html;  
28         }  
29 } 
30  
31 }

1.3.2. 安装Memcached

1、准备Memcached，解压即可

1.3.3. 安装Tomcat

1、准备两个tomcat

2、修改conf/server.xml的端口，可随意设置，只要保证两个tomcat可以正常跑起来。

3、下载memcached需要的jar包放到tomcat目录下的conf/lib下。所需jar如下：

说明：
其他版本下载链接（来自网络日志http://blog.csdn.net/remote_roamer/article/details/51133790）

#下载 memcached-session-manager jars to tomcat
http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager/1.9.5/memcached-session-manager-1.9.5.jar
http://repo1.maven.org/maven2/de/javakaffee/msm/memcached-session-manager-tc8/1.9.5/memcached-session-manager-tc8-1.9.5.jar

# 使用memcached 的时候要用到的jar文件
http://repo1.maven.org/maven2/net/spy/spymemcached/2.11.1/spymemcached-2.11.1.jar

# 使用javolution-serializer的时候用到的jar文件下载
http://repo1.maven.org/maven2/de/javakaffee/msm/msm-javolution-serializer/1.9.5/msm-javolution-serializer-1.9.5.jar
http://www.java2s.com/Code/JarDownload/javolution/javolution-5.5.1.jar.zip

# 下面是使用kryo-serializer的时候用到的jar文件下载
http://repo1.maven.org/maven2/de/javakaffee/msm/msm-kryo-serializer/1.9.5/msm-kryo-serializer-1.9.5.jar
http://repo1.maven.org/maven2/de/javakaffee/kryo-serializers/0.9/kryo-serializers-0.9.jar
 
#(相配合的kryo只能用3.+的版本。)
http://repo1.maven.org/maven2/com/esotericsoftware/kryo/3.0.3/kryo-3.0.3.jar
http://repo1.maven.org/maven2/com/esotericsoftware/minlog/1.3.0/minlog-1.3.0.jar
http://repo1.maven.org/maven2/com/esotericsoftware/reflectasm/1.11.3/reflectasm-1.11.3.jar
http://repo1.maven.org/maven2/org/ow2/asm/asm/5.1/asm-5.1.jar

4、在tomcat的conf/contex.xml文件中的context节点下追加如下内容。

<Manager className="de.javakaffee.web.msm.MemcachedBackupSessionManager"
                sticky="false"
                memcachedNodes="n1:localhost:11211"
                failoverNodes=""
                requestUriIgnorePattern=".*\\.(png|gif|jpg|css|js|ico)$"
                sessionBackupAsync="false"
                sessionBackupTimeout="500"
                transcoderFactoryClass="de.javakaffee.web.msm.serializer.javolution.JavolutionTranscoderFactory"
        />

如图：

1.4. 测试jsp文件编写

新建index.jsp文件，放到两个tomcat的webapps/ROOT目录下（或自建项目存放）。内容如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
<%@ page import="java.util.*"%>
<!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>Test</title>
</head>
<body>
        <h3>1、显示信息</h3>
        <table border="1px">
            <tr>
                <td>Nginx</td>
                <td><% out.println(request.getServerName());%></td>
            </tr>
            <tr>
                <td>Tomcat</td>
                <td><% out.println(request.getLocalAddr()+ " : "+request.getLocalPort()); %></td>
            </tr>
            <tr>
                <td>sesion ID</td>
                <td><% out.println(session.getId());%></td>
            </tr>
            <tr>
                <td>参数列表</td>
                <td>
                    <%
                        String dataName = request.getParameter("dataName");
                        if (dataName != null && dataName.length() > 0) {
                                String dataValue = request.getParameter("dataValue");
                                session.setAttribute(dataName, dataValue);
                        }
                        System.out.println("Session列表");
                        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);
                        }
                %>
                </td>
            </tr>
        </table>
        <h3>2、参数设置</h3>
        <form action="index.jsp" method="POST">
                参数名<input type="text"  name="dataName"> <br/>
                参数值<input type="text"  name="dataValue"> <br/>
                <input type="submit" value="提交">
        </form>
</body>
</html>