v1/web/modules/contrib/redis/README.Predis.txt

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Predis cache backend
====================
Using Predis for the Drupal 8 version of this module is still experimental.
Get Predis
----------
Predis can be installed to the vendor directory using composer like so:
composer require predis/predis
Configuration of module for use with Predis
----------------------------
There is not much different to configure about Predis.
Adding this to settings.php should suffice for basic usage:
$settings['redis.connection']['interface'] = 'Predis';
$settings['redis.connection']['host'] = '1.2.3.4'; // Your Redis instance hostname.
$settings['cache']['default'] = 'cache.backend.redis';
To add more magic with a primary/replica setup you can use a config like this:
$settings['redis.connection']['interface'] = 'Predis'; // Use predis library.
$settings['redis.connection']['replication'] = TRUE; // Turns on replication.
$settings['redis.connection']['replication.host'][1]['host'] = '1.2.3.4'; // Your Redis instance hostname.
$settings['redis.connection']['replication.host'][1]['port'] = '6379'; // Only required if using non-standard port.
$settings['redis.connection']['replication.host'][1]['role'] = 'primary'; // The redis instance role.
$settings['redis.connection']['replication.host'][2]['host'] = '1.2.3.5';
$settings['redis.connection']['replication.host'][2]['port'] = '6379';
$settings['redis.connection']['replication.host'][2]['role'] = 'replica';
$settings['redis.connection']['replication.host'][3]['host'] = '1.2.3.6';
$settings['redis.connection']['replication.host'][3]['port'] = '6379';
$settings['redis.connection']['replication.host'][3]['role'] = 'replica';
$settings['cache']['default'] = 'cache.backend.redis';