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OPCache

OPcache will cache .php and .phtml files within your Magento 2 application. Therefore you should add flushing OPcache to your deployment process.

Version check​

You can check the version of OPcache installed with the command:

~]# php -v | grep -i opcache
    with Zend OPcache v7.2.19, Copyright (c) 1999-2018, by Zend Technologies

Module check​

You can confirm the module has been loaded:

~]# php -m | grep -i opcache
Zend OPcache

Flush OPcache​

Service reload​

You can flush OPcache with a reload of the PHP-FPM service, always run a configuration test before reloading:

~]# php-fpm -t
[19-Aug-2019 08:48:54] NOTICE: configuration file /etc/php-fpm.conf test is successful
~]# systemctl reload php-fpm

PHP function​

You can also clear OPcache using the PHP function:

<?php
 opcache_reset();
?>

Stack OPcache settings​

We use the following sed to change the default settings of OPcache on our Magento 2 stacks:

sed -i 's/opcache.memory_consumption=128/opcache.memory_consumption=512/g' /etc/php.d/*opcache.ini
sed -i 's/opcache.interned_strings_buffer=8/opcache.interned_strings_buffer=12/g' /etc/php.d/*opcache.ini
sed -i 's/opcache.max_accelerated_files=4000/opcache.max_accelerated_files=60000/g' /etc/php.d/*opcache.ini
sed -i 's/;opcache.save_comments=0/opcache.save_comments=1/g' /etc/php.d/*opcache.ini
sed -i 's/;opcache.save_comments=1/opcache.save_comments=1/g' /etc/php.d/*opcache.ini
sed -i 's/opcache.save_comments=0/opcache.save_comments=1/g' /etc/php.d/*opcache.ini
sed -i 's/;opcache.load_comments=1/opcache.load_comments=1/g' /etc/php.d/*opcache.ini
sed -i 's/;opcache.enable_file_override=0/opcache.enable_file_override=1/g' /etc/php.d/*opcache.ini

This changes the values to:

opcache.memory_consumption=512
pcache.interned_strings_buffer=12
opcache.max_accelerated_files=60000
opcache.save_comments=1
opcache.load_comments=1
opcache.enable_file_override=1

OPcache GUI​

The OPcache GUI (https://github.com/amnuts/opcache-gui) is a very handy tool which allows you to flush cache, view the files in cache, memory statistics and lots more. You simply need to download the files to your document root:

~]# cd /var/www/vhosts/magentodomain.com/htdocs/pub/
~]# git clone https://github.com/amnuts/opcache-gui
~]# chown -R magentouser: opcache-gui

You can then browse www.magentodomain.com/opcache-gui. We recommend password /IP redirection for this URI. We have guides on how to do this here.