安装redis
sudo yum install epel-release
sudo yum update
sudo yum -y install redis安装好后启动Redis服务即可：
sudo systemctl start redis设置redis开机启动
systemctl enable redis.service安装步骤：
1.执行：git clone https://github.com/nicolasff/phpredis.git
2.执行：cd phpredis/
3.执行：phpize
4.执行：./configure
5.执行：sudo make && make install
6.编辑php.ini添加 extension=redis.so
7.重启apache
