How to install APCu Object Cache on Ubuntu and integrate in Nextcloud with Plesk

Plesk added integration of php7.3 since Version 17.8.11 Update 35, so I updated my guide for APCu in Plesk and Nextcloud-Integration.


– Plesk Onyx 17.8.11 Update 35
– plesk-php7.3 installed
– root-access


if you have not installed php7.3 yet, you can do so with the following commands as root:

plesk installer update
plesk installer --select-release-current --install-component php7.3

When this is done, we need to install the necessary dev packages for Plesk.
Depending on the usage of the PHP versions it is necessary to install several dev packages. We install the dev packages for PHP versions 5.6, 7.0, 7.1, 7.2 and the new version 7.3:

apt install plesk-php56-dev plesk-php70-dev plesk-php71-dev plesk-php72-dev plesk-php73-dev zlib1g-dev gcc

When the installation is done, we will install the corresponding APCu extension in the context of the individual PHP versions, please make sure that the version number 4.0.11 is used in PHP 5.6:

/opt/plesk/php/5.6/bin/pecl install apcu-4.0.11
/opt/plesk/php/7.0/bin/pecl install apcu
/opt/plesk/php/7.1/bin/pecl install apcu
/opt/plesk/php/7.2/bin/pecl install apcu
/opt/plesk/php/7.3/bin/pecl install apcu

Now we have to tell Plesk the new PHP extension:

echo "" > /opt/plesk/php/5.6/etc/php.d/apcu.ini
echo "" > /opt/plesk/php/7.0/etc/php.d/apcu.ini
echo "" > /opt/plesk/php/7.1/etc/php.d/apcu.ini
echo "" > /opt/plesk/php/7.2/etc/php.d/apcu.ini
echo "" > /opt/plesk/php/7.3/etc/php.d/apcu.ini

and we have to reread PHP-Handler:

plesk bin php_handler --reread

then restart php-fpm one by one:

service plesk-php56-fpm restart
service plesk-php70-fpm restart
service plesk-php71-fpm restart
service plesk-php72-fpm restart
service plesk-php73-fpm restart

If the following error message is displayed when restarting an FPM service:

Job for plesk-php56-fpm.service failed because the control process exited with error code. See "systemctl status plesk-php56-fpm.service" and "journalctl -xe" for details.

and there is no vHost using this version, this can be ignored.


Within Plesk in "Tools & Settings" -> "PHP Settings", the APCu extension should now be available when selecting a PHP version:

Customization Nextcloud-vHost in Plesk

In the corresponding vHost we adjust the PHP settings and enter the following values under "Additional configuration directives":


Now we have to tell Nextcloud to work with the APCu Object Cache. We adapt the file "config.php" in File Manager:

Here we adjust the value for"memcache.local" as follows:

'memcache.local' => '\\OC\\Memcache\\APCu',


We can verify the success with a php script that we have to load in our webspace

We can download the script apc.php here.

We have to upload this script in our vHost via the File Manager.

Then call the script in our domain via our browser, call https://nextcloud.deine-domain.tld/apc.php:

If we want to look at the "User Cache Entries", we have to replace the default password in the script „apc.php“:

In the script "apc.php" we have to find this line and adjust accordingly:

defaults('ADMIN_PASSWORD','password');          // Admin Password - CHANGE THIS TO ENABLE!!!

If you have questions, dont‘ hesitate to contact me… 🙂

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