用YII2 開發了一套程式，牽扯到的資料非重要長期快取的放單機redis中，重要的放叢集中
使用composer安裝predis擴充套件：

composer require  mojifan/yii2-predis

'redis_single' => [
            'class' => 'mojifan\redis\Connection',
            'servers'=>[
                ['host' => '127.0.0.1','port'=> 6379],
            ],
        ],
'redis_cluster' => [
            'class' => 'mojifan\redis\Connection',
            'servers'=>[
                ['host' => '127.0.0.1','port'=> 6380],
                ['host' => '127.0.0.1','port'=> 6381],
                ['host' => '127.0.0.1','port'=> 6382],
            ],
            'options'=>['cluster' => 'redis'],
        ],
 

$redis = Yii::$app->redis_single;
$redis->set('site', 'architecy.com');
$value = $redis->get('site');
echo 'The value of site in redis is: ', $value;