Memcache with Drupal 7 on CentOS 7

Install Memcached

sudo yum -y install memcached

sudo vim /etc/sysconfig/memcached

Add check and alter below settings on it --

PORT=”11211″
USER=”memcached”
MAXCONN=”1024″
CACHESIZE=”64″
OPTIONS=”-l 127.0.0.1”

sudo systemctl enable memcached
sudo systemctl restart memcached

Install Memcached PHP Extension

There are two different extensions for it namely ‘memcache’ and ‘memcahed’. We are using memcahe here.

yum -y install php-pecl-memcache

Check memcached server

sudo yum -y install nc
watch "echo stats | nc 127.0.0.1 11211"

Check php extension (memcache)

php -m | grep -i "memcache"


Enable drupal memcache module

https://drupal.org/project/memcache

Then add the following to settings.php:

<?php

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

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

$conf['memcache_stampede_protection'] = TRUE;

 $conf['cache_default_class'] = 'MemCacheDrupal';

$conf['cache_class_cache_form'] = 'DrupalDatabaseCache';

$conf['memcache_key_prefix'] = 'unique_key';

?>

Put your site back in on-line mode and you’re done! Memcache also ships with memcache_admin module which you can enable to view the statistical reports on it. This is only used for development purpose.

Troubleshoot:

If you are facing issues to connect Memcache from your browser then give Memcache access to apache:

setsebool -P httpd_can_network_memcache 1