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5.2. Install memcache module

  1. Put your site into offline mode.
  2. Download and install the memcache module.(http://drupal.org/project/memcache)
  3. Edit settings.php to make memcache the default cache class
Edit/Add /etc/drupal7/default/settings.php
$conf['cache_backends'][] = 'sites/all/modules/memcache/memcache.inc';
$conf['cache_default_class'] = 'MemCacheDrupal';
  1. Enable memcache (Performance and scalability)
  2. Bring your site back online.