1.设置Redis的仓库地址
yum install epel-release
2.安装redis
yum install redis
  修改配置文件，监听所有的IP地址

vim   /etc/redis.conf
找到下面这一行

bind 127.0.0.1
注释掉

#bind 127.0.0.1

composer require yiisoft/yii2-redis
yii2 web.php配置

        'redis'        => [
            'class'    => 'yii\redis\Connection',
            'hostname' => '127.0.0.1',
            'port'     => 6379,
            'database' => 0,
        ],

        'cache'        => [
            // 'class' => 'yii\caching\FileCache',
            'class' =>  'yii\redis\Cache',
        ],


3.启动redis，到此完成
service redis start  
 
如果需要设置开机自动启动
chkconfig redis on

daemonize yes
maxmemory 200mb