diff --git a/README.md b/README.md
index a3ba530..914b520 100644
--- a/README.md
+++ b/README.md
@@ -141,6 +141,13 @@ If your Redis instance is remote, you can use this syntax:
 
 Port is optional, default is 6379 (default Redis port).
 
+Use persistent connections
+--------------------------
+
+This mode needs the following setting:
+
+    $settings['redis.connection']['persistent'] = TRUE;
+
 Compression
 -------------------------
 Compressing the data stored in redis can massively reduce the nedeed storage.
diff --git a/composer.json b/composer.json
index ff18a35..3f468b7 100644
--- a/composer.json
+++ b/composer.json
@@ -1,10 +1,11 @@
 {
   "name": "drupal/redis",
   "type": "drupal-module",
+  "description": "Integration of Drupal with the Redis key-value store.",
   "suggest": {
     "predis/predis": "^1.1.1"
   },
-  "license": "GPL-2.0",
+  "license": "GPL-2.0-or-later",
   "autoload": {
     "psr-4": {
       "Drupal\\redis\\": "src"
diff --git a/modules/redis_sessions/README.md b/modules/redis_sessions/README.md
new file mode 100644
index 0000000..a796aa4
--- /dev/null
+++ b/modules/redis_sessions/README.md
@@ -0,0 +1,41 @@
+CONTENTS OF THIS FILE
+---------------------
+
+ * Introduction
+ * Requirements
+ * Installation
+ * Configuration
+
+
+INTRODUCTION
+------------
+
+The Redis Sessions module creates an alternative to database storage for user
+sessions. It uses a PHP Redis sessions manager and custom settings to
+use Redis for sessions handling and storage.
+
+
+REQUIREMENTS
+------------
+
+This module requires the following modules:
+
+ * Redis (https://drupal.org/project/redis)
+
+
+INSTALLATION
+------------
+
+ * Install as you would normally install a contributed Drupal module. See:
+   https://www.drupal.org/docs/8/extending-drupal-8/installing-modules
+   for further information.
+
+
+CONFIGURATION
+-------------
+
+Either include the default example.services.yml from the module, which will
+replace all supported backend services (check the file for the current list)
+or copy the service definitions into a site specific services.yml.
+
+    $settings['container_yamls'][] = 'modules/redis/modules/redis_sessions/example.services.yml';
diff --git a/modules/redis_sessions/example.services.yml b/modules/redis_sessions/example.services.yml
new file mode 100644
index 0000000..0ced19e
--- /dev/null
+++ b/modules/redis_sessions/example.services.yml
@@ -0,0 +1,14 @@
+# This file contains example services overrides.
+#
+# Enable with this line in settings.php
+#   $settings['container_yamls'][] = 'modules/redis/modules/redis_sessions/example.services.yml';
+#
+# Or copy & paste the desired services into sites/default/services.yml.
+#
+# Note that the redis module must be enabled for this to work.
+
+services:
+  # Replaces the default session handler storage with a redis implementation.
+  session_handler.storage:
+    class: SessionHandlerInterface
+    factory: ['@redis_sessions.session_handler.factory', get]
diff --git a/modules/redis_sessions/redis_sessions.info.yml b/modules/redis_sessions/redis_sessions.info.yml
new file mode 100644
index 0000000..e58b491
--- /dev/null
+++ b/modules/redis_sessions/redis_sessions.info.yml
@@ -0,0 +1,7 @@
+name: "Redis Sessions"
+description: "A module to change PHP's session handling to use Redis."
+package: "Performance"
+type: module
+core_version_requirement: ^8.8 || ^9
+dependencies:
+  - redis:redis
diff --git a/modules/redis_sessions/redis_sessions.services.yml b/modules/redis_sessions/redis_sessions.services.yml
new file mode 100644
index 0000000..7ff05aa
--- /dev/null
+++ b/modules/redis_sessions/redis_sessions.services.yml
@@ -0,0 +1,4 @@
+services:
+  redis_sessions.session_handler.factory:
+    class: Drupal\redis_sessions\Session\SessionHandlerFactory
+    arguments: ['@redis.factory']
diff --git a/modules/redis_sessions/src/Session/SessionHandlerFactory.php b/modules/redis_sessions/src/Session/SessionHandlerFactory.php
new file mode 100644
index 0000000..6d01dd9
--- /dev/null
+++ b/modules/redis_sessions/src/Session/SessionHandlerFactory.php
@@ -0,0 +1,41 @@
+<?php
+
+namespace Drupal\redis_sessions\Session;
+
+use Drupal\redis\ClientFactory;
+use Symfony\Component\HttpFoundation\Session\Storage\Handler\RedisSessionHandler;
+
+/**
+ * Session handler handling.
+ */
+class SessionHandlerFactory {
+
+  /**
+   * The client factory.
+   *
+   * @var \Drupal\redis\ClientFactory
+   */
+  protected $clientFactory;
+
+  /**
+   * Constructor.
+   *
+   * @param \Drupal\redis\ClientFactory $client_factory
+   *   The client factory.
+   */
+  public function __construct(ClientFactory $client_factory) {
+    $this->clientFactory = $client_factory;
+  }
+
+  /**
+   * Get actual session handler.
+   *
+   * @return \SessionHandlerInterface
+   *   Return the redis session handler.
+   */
+  public function get() {
+    $client = $this->clientFactory->getClient();
+    return new RedisSessionHandler($client);
+  }
+
+}
diff --git a/modules/redis_sessions/tests/src/Functional/RedisSessionWebTest.php b/modules/redis_sessions/tests/src/Functional/RedisSessionWebTest.php
new file mode 100644
index 0000000..340b9c6
--- /dev/null
+++ b/modules/redis_sessions/tests/src/Functional/RedisSessionWebTest.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace Drupal\Tests\redis_sessions\Functional;
+
+use Drupal\Component\Utility\OpCodeCache;
+use Drupal\Core\Site\Settings;
+use Drupal\Tests\redis\Functional\WebTest;
+
+/**
+ * Tests complex processes like installing modules with redis backends.
+ *
+ * @group redis
+ * @group redis_sessions
+ */
+class RedisSessionWebTest extends WebTest {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = [
+    'redis_sessions',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Set in-memory settings.
+    $settings = Settings::getAll();
+    $settings['container_yamls'][] = drupal_get_path('module', 'redis_sessions') . '/example.services.yml';
+    new Settings($settings);
+
+    // Write the containers_yaml update by hand, since writeSettings() doesn't
+    // support some of the definitions.
+    $filename = $this->siteDirectory . '/settings.php';
+    chmod($filename, 0666);
+    $contents = file_get_contents($filename);
+
+    // Add the container_yaml and cache definition.
+    $contents .= "\n\n" . '$settings["container_yamls"][] = "' . drupal_get_path('module', 'redis_sessions') . '/example.services.yml";';
+    file_put_contents($filename, $contents);
+    OpCodeCache::invalidate(DRUPAL_ROOT . '/' . $filename);
+
+    $this->rebuildContainer();
+  }
+
+}
diff --git a/redis.info.yml b/redis.info.yml
index b227ae2..9348aa6 100644
--- a/redis.info.yml
+++ b/redis.info.yml
@@ -1,6 +1,7 @@
-name: Redis
-description: Provide a module placeholder, for using as dependency for module that needs Redis.
-package: Performance
+name: "Redis"
+description: "Provide a module placeholder, for using as dependency for module that needs Redis."
+package: "Performance"
 type: module
 core_version_requirement: ^8.8 || ^9
 configure: redis.admin_display
+php: 7.1.0
diff --git a/redis.install b/redis.install
index 3730606..173f6b6 100644
--- a/redis.install
+++ b/redis.install
@@ -32,7 +32,7 @@ function redis_requirements($phase) {
       'title'       => "Redis",
       'value'       => t("Not connected."),
       'severity'    => REQUIREMENT_WARNING,
-      'description' => t("No Redis client connected, this module is useless thereof. Ensure that you enabled module using it or disable it."),
+      'description' => t("No Redis client connected, this module is therefore not used. Ensure that Redis is configured correctly, or disable this module."),
     ];
   }
 
diff --git a/src/Cache/CacheBase.php b/src/Cache/CacheBase.php
index fbe5089..61b2d74 100644
--- a/src/Cache/CacheBase.php
+++ b/src/Cache/CacheBase.php
@@ -357,7 +357,7 @@ protected function expandEntry(array $values, $allow_invalid) {
    *
    * @return array
    */
-  protected function createEntryHash($cid, $data, $expire = Cache::PERMANENT, array $tags) {
+  protected function createEntryHash($cid, $data, $expire, array $tags) {
     // Always add a cache tag for the current bin, so that we can use that for
     // invalidateAll().
     $tags[] = $this->getTagForBin();
diff --git a/src/Cache/RedisCacheTagsChecksum.php b/src/Cache/RedisCacheTagsChecksum.php
index cdbae31..a5f03dd 100644
--- a/src/Cache/RedisCacheTagsChecksum.php
+++ b/src/Cache/RedisCacheTagsChecksum.php
@@ -82,7 +82,8 @@ protected function getTagInvalidationCounts(array $tags) {
     // The mget command returns the values as an array with numeric keys,
     // combine it with the tags array to get the expected return value and run
     // it through intval() to convert to integers and FALSE to 0.
-    return array_map('intval', array_combine($tags, $this->client->mget($keys)));
+    $values = $this->client->mget($keys);
+    return $values ? array_map('intval', array_combine($tags, $values)) : [];
   }
 
   /**
diff --git a/src/Client/PhpRedis.php b/src/Client/PhpRedis.php
index f9fc11c..7fe1141 100644
--- a/src/Client/PhpRedis.php
+++ b/src/Client/PhpRedis.php
@@ -14,7 +14,7 @@ class PhpRedis implements ClientInterface {
   /**
    * {@inheritdoc}
    */
-  public function getClient($host = NULL, $port = NULL, $base = NULL, $password = NULL) {
+  public function getClient($host = NULL, $port = NULL, $base = NULL, $password = NULL, $replicationHosts = [], $persistent = FALSE) {
     $client = new \Redis();
 
     // Sentinel mode, get the real master.
@@ -25,7 +25,12 @@ public function getClient($host = NULL, $port = NULL, $base = NULL, $password =
       }
     }
 
-    $client->connect($host, $port);
+    if ($persistent) {
+      $client->pconnect($host, $port);
+    }
+    else {
+      $client->connect($host, $port);
+    }
 
     if (isset($password)) {
       $client->auth($password);
diff --git a/src/Client/Predis.php b/src/Client/Predis.php
index 747d73a..9d5d444 100644
--- a/src/Client/Predis.php
+++ b/src/Client/Predis.php
@@ -11,12 +11,13 @@
  */
 class Predis implements ClientInterface {
 
-  public function getClient($host = NULL, $port = NULL, $base = NULL, $password = NULL, $replicationHosts = NULL) {
+  public function getClient($host = NULL, $port = NULL, $base = NULL, $password = NULL, $replicationHosts = [], $persistent = FALSE) {
     $connectionInfo = [
       'password' => $password,
       'host'     => $host,
       'port'     => $port,
-      'database' => $base
+      'database' => $base,
+      'persistent' => $persistent
     ];
 
     foreach ($connectionInfo as $key => $value) {
@@ -32,17 +33,19 @@ public function getClient($host = NULL, $port = NULL, $base = NULL, $password =
     date_default_timezone_set(@date_default_timezone_get());
 
     // If we are passed in an array of $replicationHosts, we should attempt a clustered client connection.
-    if ($replicationHosts !== NULL) {
+    if (!empty($replicationHosts)) {
       $parameters = [];
 
       foreach ($replicationHosts as $replicationHost) {
+        $param = 'tcp://' . $replicationHost['host'] . ':' . $replicationHost['port']
+          . '?persistent=' . (($persistent) ? 'true' : 'false');
+
         // Configure master.
         if ($replicationHost['role'] === 'primary') {
-          $parameters[] = 'tcp://' . $replicationHost['host'] . ':' . $replicationHost['port'] . '?alias=master';
-        }
-        else {
-          $parameters[] = 'tcp://' . $replicationHost['host'] . ':' . $replicationHost['port'];
+          $param .= '&alias=master';
         }
+
+        $parameters[] = $param;
       }
 
       $options = ['replication' => true];
diff --git a/src/ClientFactory.php b/src/ClientFactory.php
index e8df702..0120ebc 100644
--- a/src/ClientFactory.php
+++ b/src/ClientFactory.php
@@ -150,6 +150,7 @@ public static function getClient() {
         'port' => self::REDIS_DEFAULT_PORT,
         'base' => self::REDIS_DEFAULT_BASE,
         'password' => self::REDIS_DEFAULT_PASSWORD,
+        'persistent' => FALSE,
       ];
 
       // If using replication, lets create the client appropriately.
@@ -165,14 +166,17 @@ public static function getClient() {
           $settings['port'],
           $settings['base'],
           $settings['password'],
-          $settings['replication.host']);
+          $settings['replication.host'],
+          $settings['persistent']);
       }
       else {
         self::$_client = self::getClientInterface()->getClient(
           $settings['host'],
           $settings['port'],
           $settings['base'],
-          $settings['password']);
+          $settings['password'],
+          [], // There are no replication hosts.
+          $settings['persistent']);
       }
     }
 
diff --git a/src/ClientInterface.php b/src/ClientInterface.php
index 38b314f..2ecd895 100644
--- a/src/ClientInterface.php
+++ b/src/ClientInterface.php
@@ -12,7 +12,7 @@ interface ClientInterface {
    * @return mixed
    *   Real client depends from the library behind.
    */
-  public function getClient($host = NULL, $port = NULL, $base = NULL);
+  public function getClient($host = NULL, $port = NULL, $base = NULL, $password = NULL, $replicationHosts = [], $persistent = FALSE);
 
   /**
    * Get underlying library name used.
diff --git a/src/Controller/ReportController.php b/src/Controller/ReportController.php
index 4a4415c..9ff362a 100755
--- a/src/Controller/ReportController.php
+++ b/src/Controller/ReportController.php
@@ -65,7 +65,7 @@ public static function create(ContainerInterface $container) {
   public function overview() {
 
     $build['report'] = [
-      '#theme' => 'status_report',
+      '#type' => 'status_report',
       '#requirements' => [],
     ];
 
@@ -171,9 +171,9 @@ public function overview() {
 
     if ($memory_config['maxmemory']) {
       $memory_value = $this->t('@used_memory / @max_memory (@used_percentage%), maxmemory policy: @policy', [
-        '@used_memory' => $info['used_memory_human'],
+        '@used_memory' => $info['used_memory_human'] ?? $info['Memory']['used_memory_human'],
         '@max_memory' => format_size($memory_config['maxmemory']),
-        '@used_percentage' => (int) ($info['used_memory'] / $memory_config['maxmemory'] * 100),
+        '@used_percentage' => (int) ($info['used_memory'] ?? $info['Memory']['used_memory'] / $memory_config['maxmemory'] * 100),
         '@policy' => $memory_config['maxmemory-policy'],
       ]);
     }
diff --git a/tests/src/Kernel/RedisLockTest.php b/tests/src/Kernel/RedisLockTest.php
index f3a9a8e..7594fcf 100644
--- a/tests/src/Kernel/RedisLockTest.php
+++ b/tests/src/Kernel/RedisLockTest.php
@@ -41,7 +41,7 @@ public function register(ContainerBuilder $container) {
   /**
    * {@inheritdoc}
    */
-  protected function setUp() {
+  protected function setUp(): void {
     parent::setUp();
     $this->lock = $this->container->get('lock');
   }