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HomeBackend DevelopmentPHP Tutorial 转 memcache保存php的session 解决多服务器的session有关问题

转 memcache保存php的session 解决多服务器的session问题

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PECL :: Package :: memcache 2.1.1 版本的 Changelog 中有一条:


- Added experimental session storage support. You can use memcached as session storage.

也就是可以直接用 memcache 来作 PHP 的 session.save_handler。


1. 安装 memcached,还是那套 ./configure; make; make install,注意 memcached 用 libevent 来作事件驱动,所以要先安装有 libevent。


2. 安装 pecl::memcache,用 pecl 命令行工具安装:


pecl install memcache

或直接从源码安装:

phpize

./configure

make

make install

将 php.ini 中 extension=memcache.so 打开,重启一下 apache,查看 phpinfo 中的 Registered save handlers 会有 files user memcache 这3个可用。


3. 修正配置文件,在 php.ini 中全局设置:


session.save_handler = memcache

session.save_path = tcp://127.0.0.1:11211

或者某个目录下的 .htaccess :

php_value session.save_handler memcache

php_value session.save_path tcp://127.0.0.1:11211

再或者在某个一个应用中:

ini_set(session.save_handler, memcache);

ini_set(session.save_path, tcp://127.0.0.1:11211);?

应用多个 memcached server 时用逗号,隔开,并且和 Memcache::addServer() 文档中阐明的一样,可以带额外的参数persistent、weight、timeout、retry_interval 等等,类似这样的:tcp://host1:port1?persistent=1&weight=2,tcp://host2:port2 。


4. 启动 memcached:


memcached -d -l 127.0.0.1 -p 11212 -m 128

5. 在程序中应用 memcache 来作 session 存储,用例子测试一下:


___FCKpd___6

6. 用 sessionid 去 memcached 里查询一下:


$memcache = memcache_connect(localhost, 11211);

var_dump($memcache->get(19216821213c65cedec65b0883238c278eeb573e077));

SESSION[TEST3] = time();

print

;

print session_id();

?>

会有看到

string(37) TEST|i:1177556731;TEST3|i:1177556881;

这样的输出,证明 session 正常工作。


用 memcache 来存储 session 在读写速度上会比 files 时快很多,而且在多个服务器须要共用 session 时会比较方便,将这些服务器都配置成应用同一组 memcached 服务器就可以,减少了额外的工作量。缺点是 session 数据都保存在 memory 中,持久化方面有所欠缺,但对 session 数据来说也不是很大的问题。

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