To use redis for caching in magento2 I added the following part in app/etc/env.php:
'cache' =>
array (
'frontend' =>
array (
'default' =>
array (
'backend' => 'Cm_Cache_Backend_Redis',
'backend_options' =>
array (
'server' => '127.0.0.1',
'port' => '6379',
'persistent' => '',
'database' => '0',
'force_standalone' => '0',
'connect_retries' => '1',
'read_timeout' => '10',
'automatic_cleaning_factor' => '0',
'compress_data' => '1',
'compress_tags' => '1',
'compress_threshold' => '20480',
'compression_lib' => 'gzip',
),
),
'page_cache' =>
array (
'backend' => 'Cm_Cache_Backend_Redis',
'backend_options' =>
array (
'server' => '127.0.0.1',
'port' => '6379',
'persistent' => '',
'database' => '1',
'force_standalone' => '0',
'connect_retries' => '1',
'read_timeout' => '10',
'automatic_cleaning_factor' => '0',
'compress_data' => '0',
'compress_tags' => '1',
'compress_threshold' => '20480',
'compression_lib' => 'gzip',
),
),
),
),