Cómo instalar y configurar Redis en Drupal 8

Voy a explicar cómo instalar y configurar Redis en Drupal 8. 

Redis es una base de datos popular basado en key-value.

En el caso de Drupal se usa como sistema de cache para la parte (backend) de gestión de contenidos, donde el sistema de cachea "estático" de las paginas no es suficiente.

Con Redis notaremos rápidamente la fluidez y rapidez con la que se puede gestionar toda la parte que requiere de usuarios autenticados.

1. Instalar Redis:
   

   sudo apt-get install redis-server

   También puedes ver Dockerfile

2. Instalar soporte de Redis para PHP:
   

   sudo apt-get install php7.0-redis
   sudo a2enmod php7.0-redis

   También puedes ver Dockerfile

3. Instalar el modulo redis de Drupal:
   

   composer require drupal/redis

   o

   drush dl redis

4. Configurar redis para Drupal:

En el settings.php o mejor en el drush añadir lo siguiente:

<?php

/**
 * Set redis configuration.
 */
/** @see: https://docs.platform.sh/frameworks/drupal8/redis.html */
if (extension_loaded('redis')) {

  // Set Redis as the default backend for any cache bin not otherwise specified.
  // $settings['cache']['default'] = 'cache.backend.redis';
  $settings['redis.connection']['interface'] = 'PhpRedis'; // Can be "Predis".
  $settings['redis.connection']['host'] = 'redis';
  $settings['redis.connection']['port'] = '6379';
  // $settings['redis.connection']['password'] = "mypassword"; // If you are using passwords, otherwise, omit

  // Apply changes to the container configuration to better leverage Redis.
  // This includes using Redis for the lock and flood control systems, as well
  // as the cache tag checksum. Alternatively, copy the contents of that file
  // to your project-specific services.yml file, modify as appropriate, and
  // remove this line.
  $settings['container_yamls'][] = 'modules/contrib/redis/example.services.yml';

  // Allow the services to work before the Redis module itself is enabled.
  $settings['container_yamls'][] = 'modules/contrib/redis/redis.services.yml';

  // Manually add the classloader path, this is required for the container cache bin definition below
  // and allows to use it without the redis module being enabled.
  $class_loader->addPsr4('Drupal\\redis\\', 'modules/contrib/redis/src');

  // Use redis for container cache.
  // The container cache is used to load the container definition itself, and
  // thus any configuration stored in the container itself is not available
  // yet. These lines force the container cache to use Redis rather than the
  // default SQL cache.
  $settings['bootstrap_container_definition'] = [
    'parameters' => [],
    'services' => [
      'redis.factory' => [
        'class' => 'Drupal\redis\ClientFactory',
      ],
      'cache.backend.redis' => [
        'class' => 'Drupal\redis\Cache\CacheBackendFactory',
        'arguments' => ['@redis.factory', '@cache_tags_provider.container', '@serialization.phpserialize'],
      ],
      'cache.container' => [
        'class' => '\Drupal\redis\Cache\PhpRedis',
        'factory' => ['@cache.backend.redis', 'get'],
        'arguments' => ['container'],
      ],
      'cache_tags_provider.container' => [
        'class' => 'Drupal\redis\Cache\RedisCacheTagsChecksum',
        'arguments' => ['@redis.factory'],
      ],
      'serialization.phpserialize' => [
        'class' => 'Drupal\Component\Serialization\PhpSerialize',
      ],
    ],
  ];

  /** Optional prefix for cache entries */
  $settings['cache_prefix'] = 'any-text-you-want';

  /** @see: https://pantheon.io/docs/redis/ */
  // Always set the fast backend for bootstrap, discover and config, otherwise
  // this gets lost when redis is enabled.
  $settings['cache']['bins']['bootstrap'] = 'cache.backend.chainedfast';
  $settings['cache']['bins']['discovery'] = 'cache.backend.chainedfast';
  $settings['cache']['bins']['config'] = 'cache.backend.chainedfast';

  /** @see: https://github.com/md-systems/redis */
  // Use for all bins otherwise specified.
  $settings['cache']['default'] = 'cache.backend.redis';

  // Use this to only use it for specific cache bins.
  $settings['cache']['bins']['render'] = 'cache.backend.redis';

  // Use for all queues unless otherwise specified for a specific queue.
  $settings['queue_default'] = 'queue.redis';

  // Or if you want to use reliable queue implementation.
  $settings['queue_default'] = 'queue.redis_reliable';

  // Use this to only use Redis for a specific queue (aggregator_feeds in this case).
  $settings['queue_service_aggregator_feeds'] = 'queue.redis';

  // Or if you want to use reliable queue implementation.
  $settings['queue_service_aggregator_feeds'] = 'queue.redis_reliable';
}

Ver https://gist.github.com/keopx/7d5fe4d7a890c792c43bb79cf56718e0

Una ves hecho esto ir a la pagina de estado (/admin/reports/status) para comprobar que todo esta bien.

NOTA: si veis que cualquier parametrización es mejor, por favor comentadlo. Gracias.

Referencias:

• https://gist.github.com/keopx/7d5fe4d7a890c792c43bb79cf56718e0
• https://docs.platform.sh/frameworks/drupal8/redis.html
• https://pantheon.io/docs/redis/
• https://github.com/md-systems/redis
• https://github.com/keopx/docker-lamp