Install and Configure Redis Cache On Magento 2

1. Compare to magento 1.x , magento 2 has come up with various cache configuration, one of these is redis.
2. Redis is an open source high performance database, in-memory data structure store. Redis is a key-value store meaning is primarily design to store data using a unique Key.
3. Redis is an optional backend cache solution to replace magento2's default Zend_Cache_Backend_File.
4. Limitation of default Zend_Cache_Backend_File is core_cache_tag table constantly grows. If a Magento instance has multiple web sites and web stores with large catalogs.
5. Advantages of Redis:

1. Extreme fast in-memory storage
2. Vertical and Horizontal Scaleable
3. Shareable among Multi Servers
4. Cache Tag Support
5. Persistence

Requirements :

• The following are the prerequisites to configure Redis Cache on Magento 2:
• Redis Server
• PHP Redis Extension
• How to configure Magento 2 to use Redis as cache storage?
• To configure Redis for Magento 2 cache, just add the following example to your app/etc/env.php:

'cache' =>

 array (

 'frontend' =>

  array (

   'default' =>

    array (

     'backend' => 'Cm_Cache_Backend_Redis',

      'backend_options' =>

      array (

       'server' => 'https://www.linkedin.com/redir/invalid-link-page?url=127%2e0%2e0%2e1',

       'port' => '6379',

       'persistent' => 0,

       'database' => '0',

       'force_standalone' => '0',

       'connect_retries' => '10',

       'read_timeout' => '30',

       'automatic_cleaning_factor' => '0',

       'compress_data' => '1',

       'compress_tags' => '1',

       'compress_threshold' => '20480',

       'compression_lib' => 'gzip',

     ),

   ),

  ),

),

• Now flush your cache:
• rm -rf /data/web/magento2/var/cache/*
• redis-cli flushall
• NOTE:
• If redis is working you should not see any files and directories in the folder var/cache/ anymore.
• Further you can connect with "redis-cli info" to check if there entries in the databases.
• Enter the following command:
• redis-cli ping
• PONG should be the response.
• If both commands succeeded, Redis is set up properly.