How to install/uninstall memcached PHP extension for Plesk PHP handlers

Question

How to install/uninstall memcached PHP extension for Plesk PHP handlers?

Answer

Note: Installation of additional PHP extension is not covered by Plesk support.

1. Connect to a Plesk server via SSH.

2. Prepare the environment:

   • on CentOS/RHEL-based distributions:

     # wget -q -O - http://www.atomicorp.com/installers/atomic | sh && yum install make memcached gcc libmemcached-devel zlib-devel plesk-php*-devel

   • on Debian/Ubuntu-based distributions:

     # apt install memcached autoconf automake gcc libmemcached-dev libhashkit-dev pkg-config plesk-php*-dev zlib1g-dev make

     Note: For Debian 12 an additional package is needed: apt install libssl-dev

3. Install the memcached PHP extension:

   Note: In the example below, we are installing memcached for PHP 7.4. For other PHP versions, replace 7.4 in the commands below with a required PHP version.

   # /opt/plesk/php/7.4/bin/pecl install memcached

   During the installation, additional parameters will be requested. Hit "Enter" for each option to install memcached with default options or specify required values:

   libmemcached directory [no] :
   zlib directory [no] :
   use system fastlz [no] :
   enable igbinary serializer [no] :
   enable msgpack serializer [no] :
   enable json serializer [no] :
   enable server protocol [no] :
   enable sasl [yes] :
   enable sessions [yes] :

4. Register extension in PHP configuration file:

   # echo "extension=memcached.so" > /opt/plesk/php/7.4/etc/php.d/memcached.ini

5. Update PHP handlers information:

   # plesk bin php_handler --reread

6. Restart the PHP-FPM service:

   # service plesk-php74-fpm restart

7. Restart the Apache service:

   • on CentOS/RHEL-based distributions:

     # service httpd restart

   • on Debian/Ubuntu-based distributions:

     # service apache2 restart

8. Verify that the memcached module has been installed:

   # /opt/plesk/php/7.4/bin/php -m | grep memcached

   memcached