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

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Aleksei Khikhich
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kb: how-to Plesk for Linux ABT: Group B

Applicable to:

  • Plesk for Linux

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

  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:

    CONFIG_TEXT: 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

 

Uninstalling memcached extension

 

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

  1. Connect to a Plesk server via SSH.

  2. Remove the memcached configuration file:

    # rm /opt/plesk/php/7.4/etc/php.d/memcached.ini

  3. Uninstall the extension:

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

  4. Update PHP handlers information:

    # plesk bin php_handler --reread

  5. Restart the PHP-FPM service:

    # service plesk-php74-fpm restart

  6. Restart the Apache service:

    • on CentOS/RHEL-based distributions:

      # service httpd restart

    • on Debian/Ubuntu-based distributions:

      # service apache2 restart

 

Comments

4 comments

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  • Avatar
    Jason Cross

    Tried using these instructions and got an error when installing the PHP extension.

    /opt/plesk/php/8.1/bin/pecl install memcached

WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update
pecl/memcached can optionally use PHP extension "igbinary" (version >= 2.0)
pecl/memcached can optionally use PHP extension "msgpack" (version >= 2.0)
downloading memcached-3.2.0.tgz ...
Starting to download memcached-3.2.0.tgz (90,722 bytes)
.....................done: 90,722 bytes
18 source files, building
running: phpize
Configuring for:
PHP Api Version:         20210902
Zend Module Api No:      20210902
Zend Extension Api No:   420210902
configure.ac:18: warning: $as_echo is obsolete; use AS_ECHO(["message"]) instead
build/php.m4:2111: PHP_CONFIG_NICE is expanded from...
configure.ac:18: the top level
configure.ac:161: warning: The macro `AC_PROG_LIBTOOL' is obsolete.
configure.ac:161: You should run autoupdate.
build/libtool.m4:99: AC_PROG_LIBTOOL is expanded from...
configure.ac:161: the top level
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] : 
building in /tmp/pear-build-rootFGnoXE/memcached-3.2.0
running: /tmp/memcached/configure --with-php-config=/opt/plesk/php/8.1/bin/php-config --with-libmemcached-dir=no --with-zlib-dir=no --with-system-fastlz=no --enable-memcached-igbinary=no --enable-memcached-msgpack=no --enable-memcached-json=no --enable-memcached-protocol=no --enable-memcached-sasl=yes --enable-memcached-session=yes
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 pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for cc... cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether the compiler supports GNU C... yes
checking whether cc accepts -g... yes
checking for cc option to enable C11 features... none needed
checking how to run the C preprocessor... cc -E
checking for icc... no
checking for suncc... no
checking for system library directory... lib
checking if compiler supports -Wl,-rpath,... yes
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
checking for PHP prefix... /opt/plesk/php/8.1
checking for PHP includes... -I/opt/plesk/php/8.1/include/php -I/opt/plesk/php/8.1/include/php/main -I/opt/plesk/php/8.1/include/php/TSRM -I/opt/plesk/php/8.1/include/php/Zend -I/opt/plesk/php/8.1/include/php/ext -I/opt/plesk/php/8.1/include/php/ext/date/lib
checking for PHP extension directory... /opt/plesk/php/8.1/lib/php/modules
checking for PHP installed headers prefix... /opt/plesk/php/8.1/include/php
checking if debug is enabled... no
checking if zts is enabled... no
checking for gawk... gawk
checking whether to enable memcached support... yes, shared
checking for libmemcached... yes, shared
checking whether to enable memcached session handler support... yes
checking whether to enable memcached igbinary serializer support... no
checking whether to enable memcached json serializer support... no
checking whether to enable memcached msgpack serializer support... no
checking whether to enable memcached sasl support... yes
checking whether to enable memcached protocol support... no
checking whether to use system FastLZ library... no
checking for ZLIB... yes, shared
checking for pkg-config... /usr/bin/pkg-config
checking for zlib location... /usr
checking for session includes... /opt/plesk/php/8.1/include/php
checking for memcached session support... enabled
checking for memcached igbinary support... disabled
checking for memcached msgpack support... disabled
checking for libmemcached location... configure: error: memcached support requires libmemcached. Use --with-libmemcached-dir=<DIR> to specify the prefix where libmemcached headers and library are located
ERROR: `/tmp/memcached/configure --with-php-config=/opt/plesk/php/8.1/bin/php-config --with-libmemcached-dir=no --with-zlib-dir=no --with-system-fastlz=no --enable-memcached-igbinary=no --enable-memcached-msgpack=no --enable-memcached-json=no --enable-memcached-protocol=no --enable-memcached-sasl=yes --enable-memcached-session=yes' failed

    Ubuntu 22.04.3 LTS

    Plesk Obsidian 18.0.54

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  • Avatar
    Jason Cross

    Nothing appears to be missing.

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

    Reading package lists... Done

    Building dependency tree... Done

    Reading state information... Done

    Note, selecting 'plesk-php80-dev' for glob 'plesk-php*-dev'

    Note, selecting 'plesk-php81-dev' for glob 'plesk-php*-dev'

    Note, selecting 'plesk-php82-dev' for glob 'plesk-php*-dev'

    autoconf is already the newest version (2.71-2).

    automake is already the newest version (1:1.16.5-1.3).

    gcc is already the newest version (4:11.2.0-1ubuntu1).

    make is already the newest version (4.3-4.1build1).

    memcached is already the newest version (1.6.14-1).

    pkg-config is already the newest version (0.29.2-1ubuntu3).

    zlib1g-dev is already the newest version (1:1.2.11.dfsg-2ubuntu9.2).

    libhashkit-dev is already the newest version (1.1.3-1+ubuntu22.04.1+deb.sury.org+1).

    libmemcached-dev is already the newest version (1.1.3-1+ubuntu22.04.1+deb.sury.org+1).

    plesk-php80-dev is already the newest version (8.0.29-ubuntu.22.04.230609.0738).

    plesk-php81-dev is already the newest version (8.1.21-ubuntu.22.04.230707.0437).

    plesk-php82-dev is already the newest version (8.2.8-ubuntu.22.04.230707.0437).

    0 upgraded, 0 newly installed, 0 to remove and 7 not upgraded.

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  • Avatar
    Son DEVRİM

    İ have a challenge for you. Memcached doesn't work anymore. I get always empty string. Memcached was working over a year without any problem... And now. Baaammm.. Any idea?

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  • Avatar
    Anastasiia Zyrianova

    Hello Jason,

    It looks like some libraries are missing on the server. 
    You may either re-run the command below:

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

    Or refer to the steps from the 'Installation errors and troubleshooting' section of the following article: https://support.plesk.com/hc/en-us/articles/12377140315671. 

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