nginx+tomcat实现负载均衡，使用redis session共享

这时候 修改nginx配置文件nginx.conf，把三台tomcat的ip地址以及端口号加入进去，使用nginx做代理

#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 {
 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;

 upstream localhost1 { 
  
   #ip_hash; 
   server 192.168.1.143:8080; 
   server 192.168.1.143:8081; 
   server 192.168.1.143:8082; 
 } 

 server {
  listen  81;
  server_name localhost;

  #charset koi8-r;

  #access_log logs/host.access.log main;

  location / {
    proxy_connect_timeout 3; 
    proxy_send_timeout  30; 
    proxy_read_timeout  30; 
    proxy_pass http://localhost1; 
  }

  #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;
 # server_name localhost;

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

 # ssl_session_timeout 5m;

 # ssl_protocols SSLv2 SSLv3 TLSv1;
 # ssl_ciphers HIGH:!aNULL:!MD5;
 # ssl_prefer_server_ciphers on;

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

}

这时候，分别启动三台tomcat以及nginx，访问http://192.168.1.133:81，这时候每次刷新页面，都会随机访问8080或者8081或者8082，而且页面上出现的session id也都是不一样的，我们应该如何让这三台tomcat共享session呢，我们使用redis来做。

这时候，在已经按照三台tomcat的服务器192.168.1.143上，安装redis，安装步骤如下：