Session共享

第一种方式：通过redis共享

1.pom配置

        <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-data-redis</artifactId>
       </dependency>
       <dependency>
           <groupId>org.springframework.session</groupId>
           <artifactId>spring-session-data-redis</artifactId>
       </dependency>

2.添加redis地址，这里用了集群，单机也可以

spring.redis.cluster.nodes=192.168.220.136:7001,192.168.220.136:7002,192.168.220.136:7003,192.168.220.135:7004,192.168.220.135:7005,192.168.220.135:7006

3.在启动类上添加@EnableRedisHttpSession注解

@EnableRedisHttpSession
public class SpringBootRedisApplication extends SpringBootServletInitializer

页面访问my.test.com时两台服务器129和133的切换效果

查看redis情况

7001上存储的是session过期时间，还有1582秒

7003上存储的是session主体，有sessionid,创建时间等

本次用到的服务器

1. 1台Nginx 192.168.220.100

upstream redis_site{
     server 192.168.220.129:8081 weight=1;
     server 192.168.220.133:8080 weight=2;
    }

server {
        listen       80;
        server_name localhost;
        server_name my.test.com;

      location =/{
            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;
            proxy_pass http://redis_site/index;

        }
       location ~/{
            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;
            proxy_pass http://redis_site;

        }

}

2. 2台redis组成的集群 192.168.220.136；192.168.220.135

3.2台tomcat服务器192.168.220.129:8081；192.168.220.133:8080

后续几种实现方式:

Tomcat通过session复制的方式

Nginx通过IP-HASH方式

memcached的MSM（Memcached_Session_Manager）方案

还有通过数据库表存储session的方式