[Drupal] How to install and configure Memcached on a Drupal 6 site?
BY meera.l
7 years ago
1 comments comment

Drupal uses a variety of caching systems to improve the site performance. However in certain scenarios they may not be sufficient and more powerful external caching mechanisms are required to improve the performance. One such mechanism is memcached. If you want to know how to install memcached in CentOs then read on to know the steps.

We had encountered such a scenario in one of our Drupal sites where the inbuilt caching mechanisms were not sufficient and Memcached turned out to be the savior. Memcached is a distributed caching system operating in memory and helps to reduce the database load and make the site faster. Each memcached daemon is able to store data as an object (key value pairs). However, simply installing memcached on your server will not make your site run any faster. To do that you have to make use of its API.

Installing Memcache


  • OS - CentOS.
  • PHP5 or higher version

Steps to install memcached on CentOS

Install memcached using

yum install memcached

Then start memcached using the command

service memcached start

Memcached listens on port 11211. Check this using the command

netstat -tap | grep memcached

Then install memcache php extension using the command

pecl install memcache

Now restart Apache using

service httpd restart

After completing these steps without any errors, you are good to go. Drupal has an API integration with memcached.

Installing Memcache module in Drupal 6

Download the memecache module and extract it into sits/all/modules and enable it.
Now you need to add two lines of code into your site's settings.php file.

$conf['cache_inc'] ='sites/all/modules/memcache/memcache.inc';
$conf['memcache_key_prefix'] ='the-name-of-the-site';

You may face a few problems while enabling memcache. Memcache needs php ini_set function enabled. If it is not, enabling the module will result in a lot of errors. In some servers ini_set is disabled because of some security reasons. You can enable it in your server by removing ini_set from disable_functions in php.ini file. Finally remember to restart Apache.

Hope this article was helpful. Share it and post your feedback as comments.



on 01st January 2008 / by webmaster
We have added a few new modules to our site recently. Drupal Technical StumbleThis Leave a reply Your email address will not be published. Required fields are marked * Sean (not verified) access_time 15 Jul 2020 - 17:47 Hi there, I uploaded the files, enabled the modules to use SU, and now I see the link, but there is no icon... How can I fix this? Thanks, Sean webmaster access_time 15 Jul 2020 - 17:47 In reply to Icon doesn't show by Sean (not verified) What do you see when you view the source? Search for stumblethis_button and you should be able to see the code for the image and the URL. Then you should be able to troubleshoot from there. Juicy Couture Addict (not verified) access_time 15 Jul 2020 - 17:47 thanks for the post. would love to hear more of you. by the way, drupal's really popular nowadays as it has easy and fast features. you agree with me? thanks. Add new comment

on 16th January 2008 / by webmaster
Most webmasters do not realize this, but a lot of the content on lot of websites can be accessed from multiple URLs. A simple example would be where www.example.com and example.com leads to the same page. This is a fatal mistake in Search Engine Optimization and search engines penalize you for duplicate content. The correct configuration would be where the above two urls will lead you to the same page but example.com will redirect you to www.example.com with a 301 (Moved permanently) status which will not result in search engines penalizing the page. It is very easy to configure 301 redirects using Apache .htaccess file and the process is the same for a Drupal installation also. Drupal Technical Apache htaccess SEO Leave a reply Your email address will not be published. Required fields are marked * Anonymous (not verified) access_time 15 Jul 2020 - 17:47 Hello. I'm trying to make example.com show as www.example.com, and I'm running into difficulties. I'm on Apache 2.0 and using the following lines in my httpd.conf file: RewriteEngine on RewriteCond %{HTTP_HOST} ^xxxxxxxxxx\.com$ [NC] RewriteRule ^(.*)$ http://www.xxxxxxxxxx.com/$1 [L,R=301] When I go to http://xxxxxxxxxx.com, I get http://www.xxxxxxxxxx.com (as expected). However, when I go to http://xxxxxxxxxx.com/node/1 (it's a Drupal site), I get a 404 thrown and the URL changes to xxxxxxxxxx.com/var/www/drupal/node/1. Same thing with www.xxxxxxxxxx.com/node/1. Any suggestions? I want to run without Drupal's .htaccess file (instead incorporating these calls into my httpd.conf file). webmaster access_time 15 Jul 2020 - 17:47 In reply to Rewrite including filesystem path by Anonymous (not verified) I think the problem is with the base path which results in the redirection to /var/www/ part. The best approach I would think is to start with drupal htaccess and then strip out parts and move to httpd SNVC (not verified) access_time 15 Jul 2020 - 17:47 This is definitely a good guide. Thanks for this. wellyson access_time 15 Jul 2020 - 17:47 This is really nice and helpful. Add new comment

on 08th February 2008 / by webmaster
Attachment Size slashdotit.tar.gz 173.55 KB Similar to the StumbleThis module that we had created earlier we have created another bookmarking Drupal Technical Slashdotit Leave a reply Your email address will not be published. Required fields are marked * Shlomi Fish (not verified) access_time 15 Jul 2020 - 17:47 Hi! I'm interested in this module, but Drupal 6.2 complains that it's incompatible with it. Can you please update it or tell me how? Regards, Shlomi Fish shlomifish.org webmaster access_time 15 Jul 2020 - 17:47 In reply to Can you update it for Drupal-6.x? by Shlomi Fish (not verified) Sure we are working on this currently and will post an update soon. Also we will post this module on www.drupal.org as well Cheers Anoop John Team Zyxware Anonymous (not verified) access_time 15 Jul 2020 - 17:47 Hello! Nice Article very interesting, thanks Add new comment
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Thank your share,

/* Drupal 6 */
$conf['cache_inc'] ='sites/all/modules/memcache/memcache.inc';

/* Drupal 7 */
$conf['cache_backends'][] = 'sites/all/modules/memcache/memcache.inc';