default_option.php

См. документацию.

<?php
$cluster_default_option = [
    'max_slave_delay' => 10,
    'slave_status_cache_time' => 10,
    'cache_type' => 'memcache',
    'redis_pconnect' => 'Y',
    'failower_settings' => 0,
    'redis_timeoit' => 0,
    'redis_read_timeout' => 0,
    'redis_persistent' => 'Y'
];