session存redis

Nginx设置(修改nginx.conf文件)

#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;

    sendfile        on;
    keepalive_timeout  65;


    # 负载均衡设置
    upstream localhost {
        server localhost:9200;
        server localhost:9201;
    }

    server {
        listen 80;

        location / {
            proxy_pass http://localhost;
        }
    }
    
    # 第一个站点
    server {
        listen       9200;
        server_name  localhost:9200;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

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

        #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(.*)$  {
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.php;
            fastcgi_split_path_info  ^((?U).+\.php)(/?.+)$;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            fastcgi_param  PATH_INFO  $fastcgi_path_info;
            fastcgi_param  PATH_TRANSLATED  $document_root$fastcgi_path_info;
            include        fastcgi_params;
        }

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

    # 第二个站点
    server {
        listen       9201;
        server_name  localhost:9201;

        location / {
            root   html2;
            index  index.php index.html index.htm;
        }
        
        location ~ \.php(.*)$  {
            root   html2;
            fastcgi_pass   127.0.0.1:9900;
            fastcgi_index  index.php;
            fastcgi_split_path_info  ^((?U).+\.php)(/?.+)$;
            fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
            fastcgi_param  PATH_INFO  $fastcgi_path_info;
            fastcgi_param  PATH_TRANSLATED  $document_root$fastcgi_path_info;
            include        fastcgi_params;
        }
        
    }


}

PHP设置(修改php.ini文件)
去掉“;”分号

cgi.fix_pathinfo=1

修改

session.save_handler = redis
session.save_path = "tcp://127.0.0.1:6379"

PHP代码内

echo '111-9200';

//如果未修改php.ini下面两行注释去掉
//ini_set('session.save_handler', 'redis');
//ini_set('session.save_path', 'tcp://127.0.0.1:6379');
session_start();
$_SESSION['sessionid'] = session_id();
echo $_SESSION['sessionid'];
echo '<br/>';

$redis = new redis();
$redis->connect('127.0.0.1', 6379);
//redis用session_id作为key并且是以string的形式存储
echo $redis->get('PHPREDIS_SESSION:' . session_id());

心得：
session_id 是在负载均衡那一步生成的。不用担心访问不同的服务器，session_id不一致的情况。

问题：
nginx的配置问题吧，第二个网站ini_set() 和 redis扩展，都不能使用，不知道为啥。