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How to install the APCu PHP module on a Plesk server?

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Alexander Tsmokalyuk
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Plesk for Linux kb: technical

Since this is NPR better to keep it internal

Applicable to:

  • Plesk for Linux

Question

How to install APCu PHP module for Plesk PHP?

Answer

Warning: APCu is not officially supported by Plesk and was not tested extensively. Use the instructions below at your own risk.

  1. Connect to the server via SSH.

  2. Install required development packages:

    • For .deb-based OS (Ubuntu, Debian):

      # apt install plesk-php80-dev zlib1g-dev gcc make

    • For .rpm-based OS (CentOS, RHEL, CloudLinux):

      # yum install plesk-php80-devel zlib-devel gcc make

    Note: As an example, Plesk PHP 7.0 development package is installed. For a different version of PHP change php80 to the required version, for instance, php70, php56

  3. Install the APCu PHP module:

    • For Plesk PHP 5.x:

      # /opt/plesk/php/5.x/bin/pecl install apcu-4.0.11

    • For Plesk PHP 7.x::

      # /opt/plesk/php/7.x/bin/pecl install apcu

    • For Plesk PHP 8.x
      # /opt/plesk/php/8.x/bin/pecl install apcu

  2. Enable APCu in PHP configuration:

    # echo "extension=apcu.so" > /opt/plesk/php/8.0/etc/php.d/apcu.ini

  3. Restart PHP service and refresh PHP handlers information:

    # service plesk-php80-fpm restart

    # plesk bin php_handler --reread

  4. Verify that the module is loaded and is working:

    # /opt/plesk/php/8.0/bin/php -i | grep apc.enabled
    apc.enabled => On => On

    To check whether APCu is enabled, open the php_info() page and find the following content:
    https://user-images.githubusercontent.com/6899856/55636220-b3017580-57c2-11e9-9e32-1ee8a011d985.png

Comments

13 comments

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  • Avatar
    Dennis

    Hi,

    i've got this error, if i try to install APCu in CentOS7:

     

    [root@server ~]# /opt/plesk/php/7.2/bin/pecl install apcu
    WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-upd ate pecl.php.net" to update
    downloading apcu-5.1.12.tgz ...
    Starting to download apcu-5.1.12.tgz (105,890 bytes)
    ........................done: 105,890 bytes
    39 source files, building
    running: phpize
    Configuring for:
    PHP Api Version: 20100412
    Zend Module Api No: 20100525
    Zend Extension Api No: 220100525
    Enable internal debugging in APCu [no] : no
    building in /tmp/pear-build-rootSxUmme/apcu-5.1.12
    running: /tmp/apcu/configure --with-php-config=/usr/bin/php-config --enable-apcu -debug=no
    checking for grep that handles long lines and -e... /usr/bin/grep
    checking for egrep... /usr/bin/grep -E
    checking for a sed that does not truncate output... /usr/bin/sed
    checking for cc... no
    checking for gcc... no
    configure: error: in `/tmp/pear-build-rootSxUmme/apcu-5.1.12':
    configure: error: no acceptable C compiler found in $PATH
    See `config.log' for more details
    ERROR: `/tmp/apcu/configure --with-php-config=/usr/bin/php-config --enable-apcu- debug=no' failed

     

    Can anyone help? :)

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  • Avatar
    Ivan Postnikov

    Hello @Dennis,

    The main error message part here is "configure: error: no acceptable C compiler found in $PATH".

    It means either you don't have gcc installed or it's not in your $PATH variable.

    To install gcc use this: (run as root)

    yum groupinstall "Development Tools"
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  • Avatar
    suresh C

    hi

    In second point,

    Is this correct "plesk-php70-dev"

    Since I am getting error "unable to locate package plesk-php70-dev"

    My current php version is 5.6.37 in plesk for websites.

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  • Avatar
    Ivan Postnikov

    Hello @surech C,

    As it is written in note for this article "As an example, Plesk PHP 7.0 development package is installed. For a different version of PHP change php70 to the required version, for instance, php56".

    In case you need to install the module for PHP 5.6, install package "plesk-php56-devel" instead of "plesk-php70-devel".

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  • Avatar
    suresh C

    Thanks for the reply.

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  • Avatar
    suresh C

    I entered root via ssh

    and typed 'plesk' to manage server.

    I typed 

    # apt install plesk-php-56dev zlib1g-dev gcc

    I am getting error       unable to locate package zlib1g

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  • Avatar
    Ivan Postnikov

    @suresh C, please, let me know OS version you use.

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  • Avatar
    suresh C

    hi Ivan

    The OS is ubuntu 16.04.5 LTS

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  • Avatar
    suresh C

    I did these after ssh login

    Now working fine after putting 1 in zlib1g

    # apt install plesk-php-56dev zlib1g-dev gcc

    Given apcu full compatibilty-yes

    given internal debugging-no

    Tried 5th point, its not working. (Replaced php70 with php56) to restart. 

    7th point is working apcu-enabled

     

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  • Avatar
    Ivan Postnikov

    @suresh C, thank you for sharing

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  • Avatar
    Nikolai Graf-Rüssel

    Hi there,

    great tutorial, but I needed to install

    # apt-get install make gcc

    first, in order to work properly.

    thanks.

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  • Avatar
    Carlo Angeletti

    Hi guys,

    i've a problem with php 7.3

    PHP Warning: PHP Startup: Unable to load dynamic library 'apcu.so' (tried: /opt/plesk/php/7.3/lib/php/modules/apcu.so (/opt/plesk/php/7.3/lib/php/modules/apcu.so: cannot open shared object file: No such file or directory), /opt/plesk/php/7.3/lib/php/modules/apcu.so.so (/opt/plesk/php/7.3/lib/php/modules/apcu.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
    WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update
    downloading apcu-5.1.17.tgz ...
    Starting to download apcu-5.1.17.tgz (94,814 bytes)
    .....................done: 94,814 bytes

    Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in PEAR/PackageFile/v2/Validator.php on line 1933
    PHP Warning: "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? in /opt/plesk/php/7.3/share/pear/PEAR/PackageFile/v2/Validator.php on line 1933
    39 source files, building
    running: phpize
    sh: phpize: command not found
    ERROR: `phpize' failed

     

    With php7.2 i've no problem

     

    Someone can help me?

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  • Avatar
    Maxim Krasikov (Edited )

    Hello @Carlo Angeletti,

    The error reported caused by missing package plesk-php73-dev. Please install the package:
    For Ubuntu, Debian:

    # apt install plesk-php73-dev zlib1g-dev gcc

    For CentOS, RHEL:

    # yum install plesk-php73-devel zlib-devel gcc


    After this step, proceed with the module installation.

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