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PHP APCu and Redis Cache for WordPress

I will show you how to install and configure APCu and Redis memory caching on linux server

—– Commands to Install and configure APCu and Redis ———-

Step 1: Install APCu and Redis.

          sudo apt install php-apcu redis-server php-redis

          sudo service apache2 restart

Step 2: Edit the configuration file.

          sudo nano /etc/redis/redis.conf

– Ctrl+w to search “port” and change.

          port 6379

          to

          port 0

– Then Ctrl+w to search for and uncomment.

          unixsocket /var/run/redis/redis.sock

          unixsocketperm 700

          Change to

          unixsocketperm 770

– Ctrl+x, then ‘Y’ to save and exit.

– Let’s check if the socket appeared in /var/run/redis/redis-server.sock

Step 3: Add the Redis user redis to the www-data group.

          sudo usermod -a -G redis www-data

Step 4: Restart Apache.

          sudo service apache2 restart

Step 5: Start Redis server.

          sudo service redis-server start

Step 6: Add the caching configuration to the Nextcloud config file.

          sudo nano /var/www/html/nextcloud/config/config.php

– Add the following right after the last line and before the ‘);’

    (before the last parenthesis and semicolon)

    ‘memcache.local’ => ‘\OC\Memcache\APCu’,

    ‘distributed’ => ‘\\OC\\Memcache\\Redis’,

    ‘memcache.locking’ => ‘\\OC\\Memcache\\Redis’,

    ‘filelocking.enabled’ => ‘true’,

    ‘redis’ => 

     array (

     ‘host’ => ‘/var/run/redis/redis-server.sock’,

     ‘port’ => 0,

     ‘timeout’ => 0.0,

    ),

– Ctrl + x, then ‘Y’ to save and exit.

– To verify Redis is enabled to start on boot:

       sudo systemctl enable redis-server

– Lets proceed fixing some errors in Security & Setup Warning. 

– Enable .htaccess

       sudo nano /etc/apache2/apache2.conf

       Then change

        <Directory /var/www/>        

        Options Indexes FollowSymLinks

        AllowOverride None

        Require all granted

        </Directory>

    To

       <Directory /var/www/>

        Options Indexes FollowSymLinks

        AllowOverride All

        Require all granted

        </Directory>

– Save and quit, then restart Apache with:

        sudo service apache2 restart

– Change size of memory limit.

        sed -i ‘/^memory_limit =/s/=.*/= 512M/’ /etc/php/7.4/apache2/php.ini

– Install recommended PHP modules.

       sudo apt install php7.4-bcmath

       sudo apt install php7.4-gmp

       sudo service apache2 restart

                  – End –

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