nginx+tomcat+redis做集群负载均衡

下面说明详细的配置步骤:

  (1)nginx中配置nginx.conf文件内容:

upstream myserver{  
        server 192.168.1.10:80 weight=3 max_fails=3 fail_timeout=20s;  
        server 192.168.1.20:80 weight=1 max_fails=3 fail_timeout=20s;  
        server 192.168.1.30:80 weight=4 max_fails=3 fail_timeout=20s;  
     }    server{  
       listen 80;  
       server_name   www.xxx.com 192.168.1.100;  
       index index.htm index.html  
       root /web/root;  
       location / {               proxy_pass http://myserver;  
             proxy_next_upstream http_500 http_502 http_503 error timeout invalid_header;  
             include /usr/local/nginx/conf/proxy.conf;  
        }

       
       (2) tomcat 的配置(tomcat 7,jdk1.7):
             首先需要将tomcat把session写至redis的jar包(3个)放至tomcat的lib目录中,虽然需要3个，但我从官网下载的源码使用gradle编译后生成了3个，我都放到lib里了,
                jedis-2.5.2.jar commons-pool2-2.2.jar  tomcat-redis-session-manager-master-2.0.0.jar   
                tomcat-redis-session-manager-master-2.0.0-sources.jar    tomcat-redis-session-manager-master-2.0.0-javadoc.jar
      (3) 修改tomcat中context.xml中的内容:

<Context>
     <Valve className="com.orangefunction.tomcat.redissessions.RedisSessionHandlerValve" /> 
      <Manager className="com.orangefunction.tomcat.redissessions.RedisSessionManager"  
          host="localhost"  
          port="6379"  
          database="0"  
          maxInactiveInterval="60" />  
 </Context>

      通过上面3步即可完成nginx反向代理的tomcat负载均衡,这样的负载均衡策略，有一大优势：就是session存放在redis中,其中任意一个tomcat挂掉，不会影响正常的用户访问。用户也不需要重新获取session信息.