Installation

apt-get -y install php5-memcache memcached

Module Drupal : https://ftp.drupal.org/files/projects/memcache-7.x-1.5.tar.gz

Configuration

Fichier sites/default/settings.php 

//Use memcache
$conf['cache_backends'][] = 'sites/all/modules/memcache/memcache.inc';
$conf['cache_default_class'] = 'MemCacheDrupal';
$conf['cache_inc'] = 'sites/all/modules/contrib/memcache/memcache.inc';

//Memcache session
$conf['session_inc'] = 'sites/all/modules/memcache/unstable/memcache-session.inc';

//Memcache lock
$conf['lock_inc'] = 'sites/all/modules/memcache/memcache-lock.inc';

//Add in stampede protection
$conf['memcache_stampede_protection'] = TRUE;

//Don't bootstrap the database when serving pages from the cache.
$conf['page_cache_without_database'] = TRUE;
$conf['page_cache_invoke_hooks'] = FALSE;