ansible-inventories/arocom#192 Redis Support for Drupal 8

templates/d8_settings.php

@@ -59,6 +59,63 @@ $config_directories['{{ directory }}'] = 'sites/{{ item.shortname|default("defau
 {{ line }}
 {% endfor %}
 
+// Set redis configuration.
+if (extension_loaded('redis')) {
+  // Set Redis as the default backend for any cache bin not otherwise specified.
+  $settings['redis.connection']['interface'] = 'PhpRedis';
+  $settings['cache']['default'] = 'cache.backend.redis';
+  $settings['redis.connection']['host'] = '127.0.0.1';
+
+  // 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'],
+      ],
+      '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'],
+      ],
+    ],
+  ];
+
+  // Set a fixed prefix so that all requests share the same prefix, even if
+  // on different domains.
+{% if drupal.jail is defined %}
+  $settings['cache_prefix'] = '{{ drupal.jail.name }}_{{ item.shortname|default("default") }}_';
+{% else %}
+  $settings['cache_prefix'] = '{{ item.shortname|default("default") }}_';
+{% endif %}
+}
+
 if (file_exists(__DIR__ . '/settings.local.php')) {
   include __DIR__ . '/settings.local.php';
 }