基于Nginx分布式Tomcat+Redis 实现Session共享 for window

参考：http://www.cnblogs.com/lengfo/p/4260363.html

 

近期为CAS-SSO准备搭建Session共享，小编研究了下基于Nginx负载均衡，分布式Tomcat+Redis 存储Session，实现分布式Tomcat的Session共享，for window下~~~不要问我为什么window下（linux的资源太多了~~~）

原理：

首先，sessionID的产生，当用户发起请求时，web服务器将产生一个sessionID返回给用户，由浏览器cookie记录该sessionID，下次再请求，浏览器将cookie记录的sessionID一并发给web服务器，web服务器判断请求头中含有sessionID，则不再新建sessionID，也说明该用户已登录or已访问.........

注：浏览器发送的请求中有个Host字段，标记请求的目标服务器，即使访问的应用是相同的，但由于不同的目标请求服务器，产生并返回的sessionID肯定不一样的....所以这里必须有负载均衡器，如Nginx or Haproxy来做转发，确保请求的目标服务器都指向负载均衡那台，然后通过cookie=sessionID，发送给web服务器，获取对应的session内容。

其次，采用Redis做session缓存服务器，将原本tomcat自身存储的session，转移存储到redis缓存服务器上，实现分布式的tomcat共享session。
 

1.下载Nginx for winow（linux的请无视）

2.下载tomcat7

3.下载redis for window64 只有64bit，不要问为什么没有32位（linux的请无视）

4.下载tomcat7依赖redis 必须的jar tomcat-redis-session-manager-1.2-tomcat-7.jar、jedis-2.1.0.jar、commons-pool-1.6.jar 注意版本必须配对..jedis-2.1对应commons-pool-1.6；

详见附件

 

5.配置nginx.conf，红色部分为新增修改地方

 

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
#采用轮询方式，配置对应的tomcat访问，“site”可以自定义
	 upstream site {  
    server 10.89.113.112:8080 weight=1; 
    server 10.92.2.23:8091 weight=1; 
}  

    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

   

    server {
        listen       80;
#server_name 用于访问Nginx的url，可以用域名如“www.xxx.com” 自定义
        server_name  10.89.113.184;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;
	#指定web上下文
        location /web-one {
             #root   html;
             #index  index.html index.htm index.jsp;
#proxy_pass "site"必须同upstream 配置的名称一致
	    proxy_pass        http://site;
            #proxy_set_header  X-Real-IP  $remote_addr;    
             #client_max_body_size  100m; 
        }

	

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }

	

    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

 2.配置redis.windows.conf ，搜索maxheap 并新增maxheap 1024000000，可以写bat启动脚本startup.bat

 

redis-server  redis.windows.conf 

 3.新建web-app，修改index.jsp，新增打印sessionId，用于判断是否session共享成功

 

 

<html>
<body>
<h2>Hello World!! web-one-tomcat.1 </h2>

SessionID:<%=session.getId()%>


</body>
</html>

4. 将tomcat7依赖的redis 相关的jar tomcat-redis-session-manager-1.2-tomcat-7.jar、jedis-2.1.0.jar、commons- pool-1.6.jar copyto “lib”文件夹下

 

5.修改“conf”文件夹下的context.xml，将原先的<Manager>内容注释掉；新增以下内容

 

<!--redis config-->
	<Valve className="com.radiadesign.catalina.session.RedisSessionHandlerValve" />  
	<!-- host: optional: defaults to "localhost" -->  
	<!-- port: optional: defaults to "6379" -->  
	 <!-- database: optional: defaults to "0" -->  
	  <!-- maxInactiveInterval:optional: defaults to "60" (in seconds) -->  
    <Manager className="com.radiadesign.catalina.session.RedisSessionManager"
    host="10.89.113.112" <!-- host: optional: defaults to "localhost" -->  
    port="6379" <!-- port: optional: defaults to "6379" -->  
    database="0"<!-- database: optional: defaults to "0" -->  
    maxInactiveInterval="180" /> <!-- maxInactiveInterval:optional: defaults to "60" (in seconds) -->  

 

 

6.依次按照，启动redis、tocmat、nginx~~

 

7.访问http://10.89.113.184/web-one <---nginx所配置的访问地址，将自动负载路由到不同的tomcat上，根据现实出相同的sessionID，实现session间共享；