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

Steps for installing and configuring XHProf with Drupal 7 on CentOS 7

Execution time of each and every method involved in a single HTTP Request is the key factor for overall page load time and the process of collecting these information is called profiling.The two more popular extensions for this purpose are Derick Rethans‘ Xdebug and Facebook’s XHProf. Here we are focussing on XHProf only. 

Please follow the below steps to setup XHProf for Drupal 7 on your CentOS 7 environment with Apache.

Step 1:

Install plugin

            sudo yum --enablerepo=remi,remi-php55 install xhprof

This plugin is for loading graphical content

            sudo yum --enablerepo=remi,remi-php55 install php5-common graphviz

Step 2:

Enable the Xhprof module within php.ini file and specify the directory.

            extension=xhprof.so

            xhprof.output_dir="/tmp/xhprof"

Step 3:

Checking configuration files

cd /usr/share/xhprof/

Here, two folders xhprof_html and xhprof_lib should be available

Step 4:

Create a sym link to xhprof configuration files

sudo ln -s /usr/share/xhprof/xhprof_html/ xhprof

Step 5:

Virtual host configuration.

Open file --

vi vhosts.conf

Add entry --

<VirtualHost *:80>

        ServerAdmin vagrant@xyz.com

        DocumentRoot /var/www/html/xhprof

        ServerName xhprof.localhost

        Serveralias xhprof.xyz.com

        <Directory "/var/www/html/xhprof">

                #AllowOverride None

                AllowOverride All

                Require all granted

        </Directory>

</VirtualHost>

Open windows host file and add entry --

192.168.56.101 xhprof.xyz.com

Step 6:

Create a temporary directory.

cd /tmp

mkdir xhprof

chmod 777 /tmp/xhprof

Step 7:

Restarting PHP and httpd service.

            sudo systemctl restart php-fpm

            sudo systemctl restart httpd

Step 8: Enable Xhprof with Drupal 7 Devel module.
              drush dl devel
              drush en devel

drush vset devel_xhprof_enabled 1

drush vset devel_xhprof_directory "/usr/share/xhprof/"

drush vset devel_xhprof_url "http://xhprof.xyz.com/"

Step 9:

Clear drush cache and drupal cache

drush cache-clear drush

drush cache-clear all

Note:

Do not keep it (XHProf) enabled all the time. Before hitting the particular URL (for which you want to do profiling) on your browser enable it first. Once the page execution been completed then disable it immediately using below drush command.

To Enable : drush vset devel_xhprof_enabled 1

To Disable : drush vset devel_xhprof_enabled 0

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