Brevet/dev/provisioning/ansible/roles/nextcloud/templates/redis.config.php.j2

<?php
$CONFIG = array (
  'filelocking.enabled' => true,
  'memcache.locking' => '\OC\Memcache\Redis',
  'redis' => array (
    'host' => '{{ redis_host }}',
    'port' => {{ redis_port }},
    'dbindex'  => 0,
    'timeout' => 1.5,
  ),
{% if (groups['web_servers'] | length) > 10 %}
  'memcache.distributed' => '\OC\Memcache\Redis',
{% endif %}
);