Speeding up Drupal 7 on Centos 6 with Memcache APC and some modules

This page is mainly a list of the commands and config file changes used in the tutorial, there are also some comments, but the main information can be seen in the tutorial which is on youtube at:


First you start off with a minimal install of Centos 6 and you should set up its networking, then update it. Next you should install the EPEL repository, then the services and extensions that are required by Drupal:

yum -y install epel-release

yum -y install httpd mysql-server php php-mysql php-pdo php-common php-cli php-gd php-mbstring php-dom p7zip libcgroup

If you have a fast machine then you can also limit the performance of apache so that the speed improvements are more obvious


group limitcpu{
          cpu {
                    cpu.cfs_quota_us = 100000;
                    cpu.cfs_period_us = 1000000;



Then you have to start the relevant cgroup services and restart apache


reboot && exit

Then run the mysql client and set up an empty database and user for Drupal:

create database drupal;
GRANT ALL PRIVILEGES ON drupal.* TO 'drupal'@'localhost' IDENTIFIED BY 'password';

Download drupal and copy it to the webroot, then install the modules that match the Drupal database file that you can download below:


chown -R apache /var/www/html/sites/default

chown -R apache /var/www/html/sites/all/modules





I have prepared a backup file that has 100000 dummy content nodes and a view that displays them that you can download at the bottom of this page. You need all of the above modules because they were the ones that were installed when the backup was made. The login username for this backup is 'admin', with a password of 'password'.

You should now edit /etc/my.cnf and put in the below settings, then delete the log files in /var/lib/mysql and restart the mysqld service:

innodb_buffer_pool_size = 6G
innodb_flush_method = O_DIRECT
innodb_log_file_size = 256M
innodb_log_buffer_size = 4M
innodb_flush_log_at_trx_commit = 0
innodb_fast_shutdown = 0

If you want to test drupal with a slightly heavier theme then you can download this Zymphonies one:

You can then open up another terminal and run this apache bench command to see how Drupal is currently performing:

ab -n 100 -c 10 http://drupal.localdomain/

You can then turn on Drupals caching and see how this has changed the apache bench results.

You can also now run the below command to see how slow the view is. It is best to run it now, because it would probably take too long if run before the database config was adjusted

ab -n 10 -c 10 http://drupal.localdomain/?q=test-view

Then you can install memcache with its php extensions and install the Drupal memcache module, along with the apc php cache extension, then see how the apache bench results have changed:


yum -y install memcached php-pecl-apc php-devel gcc automake autoconf libtool make zlib-devel

pecl install memcache-3.0.8

nano /etc/sysconfig/memcached

OPTIONS="-s /var/run/memcached/memcached.sock -a 0766"


nano /var/www/html/sites/default/settings.php

$conf['cache_backends'][] = 'sites/all/modules/memcache/memcache.inc';
$conf['cache_default_class'] = 'MemCacheDrupal';
$conf['cache_class_cache_form'] = 'DrupalDatabaseCache';
$conf['memcache_servers'] = array('unix:///var/run/memcached/memcached.sock' => 'default');

nano /etc/php.d/memcache.ini

; Data will be transferred in chunks of this size
memcache.chunk_size = 32768
memcache.hash_strategy = consistent
memcache.default_port = 0
session.save_handler = memcache
session.save_path = "unix:///var/run/memcached/memcached.sock?persistent=1&weight=1&timeout=1&retry_interval=15"

nano /etc/php.d/apc.ini


service memcached start
service httpd restart

Finally you can try out these other Drupal caching modules to see how they change the results that apache bench is giving:



When AdvAgg destroys your css, you then have to make sure that your clean urls are working, by editing the apache config

If you feel brave you can also try to enable the jsmin php module, which will then lead you into the below adventure:

pecl install jsmin

rpm -ivh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

nano /etc/yum.repos.d/remi.repo

yum -y update php*

yum install php-pecl-memcache

pecl install jsmin

nano /etc/php.d/jsmin.ini

service httpd restart

yum install php-opcache

service httpd restart