Comments on: Storing your PHP sessions using memcached

By: Guillaume Plessis

Guillaume Plessis — Sun, 11 Dec 2011 11:57:02 +0000

@Stefan : thanks for this notice and for sharing scache. It’s clear that using Memcached to store PHP sessions requires some precaution to avoid data loss : monitoring of the available key space and redundancy.
Antoher performant solution for persistent session storage is Redis. FYI, the phpredis extension (php5-redis package) has a built-in session handler.

By: Stefan

Stefan — Sat, 10 Dec 2011 20:49:39 +0000

Problem with using memcached for session backend is that it does not quarantee to retain data until its TTL expires. It can freely expire entries prematurely to free up memory for new data to be stored. By storing session data there, you might end up losing your session or parts of your session without knowing it has happened.

To be provide reliable solution, you need to store data redundantly somewhere else or you need persistent storage for you sessions. One lightweight solution is Scache (http://scache.nanona.fi).

By: Guillaume Plessis

Guillaume Plessis — Fri, 21 Oct 2011 05:45:50 +0000

@Bughunter : your solution is wrong in à non-sticky load-balanced environment

By: Bughunter

Bughunter — Fri, 21 Oct 2011 00:37:10 +0000

this is overhead – if it is just for the session files, mount your /tmp to a ramdisk
tmpfs /tmp tmpfs defaults 0 0

By: xdaudaudau

xdaudaudau — Tue, 11 Oct 2011 13:31:24 +0000

it seems that many site are confused between memcache and memcached.

for memcached : http://fr2.php.net/manual/en/book.memcached.php

or
http://www.solanara.net/solanara/memcached
the 2nd one is not in english, but realy helpfull

By: Web Hosting

Web Hosting — Tue, 27 Sep 2011 07:46:25 +0000

Just wanted to tell that I use memcached to store session files with Debian 6.0 for hosting many websites and it works perfectly!

By: What do I change in php.ini file so that the sessions are handled in memcache? - Admins Goodies

Sun, 14 Aug 2011 09:08:04 +0000

[...] answer, read these pages, and it should explain it a bit [...]

By: Hakan

Hakan — Wed, 06 Jul 2011 08:48:14 +0000

Hi guys,

My Server Debian 6, i use PHP 5.3.6 and Memcached version 2.0.0b1.

ı traying start session but memcache gived error:

Apache error log msg:

PHP Warning: Unknown: Failed to write session data (memcached). Please verify that the current setting of session.save_path is correct (tcp://127.0.0.1:11211) in Unknown on line 0

I’m and more than 5K people need solutions for this problem.

By: Which No-SQL DBs are recommended for storing PHP session data? - Quora

Which No-SQL DBs are recommended for storing PHP session data? - Quora — Tue, 11 Jan 2011 17:20:40 +0000

[...] Why not use memcached? There's already an adapter for it. Instructions are available here: http://www.dotdeb.org/2008/08/25…Insert a dynamic date hereCannot add comment at this [...]

By: codef0rmer

codef0rmer — Thu, 14 Oct 2010 08:06:40 +0000

I have installed memcache on server 192.168.0.1 to store sessions.

In firefox, i accessed 192.168.0.2/index.php:
ini_set(‘session.save_handler’, “memcache”);
ini_set(‘session.save_path’, “tcp://192.168.0.1:11211?persistent=1&weight=1&timeout=1&retry_interval=15″);
session_start();
$_SESSION['username'] = ‘foobar’;
print_r($_SESSION); //Prints above defined session array

Again in firefox in new tab, i accessed 192.168.0.3/index.php:
ini_set(‘session.save_handler’, “memcache”);
ini_set(‘session.save_path’, “tcp://192.168.0.1:11211?persistent=1&weight=1&timeout=1&retry_interval=15″);
session_start();
print_r($_SESSION); //It should print above defined session array

But it does not work in my case. Will it affect as I m setting save handler and path using ini_set?