目前为止还没有apt-get封装好的redis扩展包，只能编译安装
sudo apt-get update && sudo apt-get upgrade
apt-get install php7.0-dev # 为了有phpize命令
git clone https://github.com/phpredis/phpredis.git # 下载redi包，需要翻墙才能下载
cd phpredis
git checkout php7
phpize
./configure
make && make install
cd ..
rm -rf phpredis
echo "extension=redis.so" > /etc/php/7.0/mods-available/redis.ini
ln -sf /etc/php/7.0/mods-available/redis.ini /etc/php/7.0/fpm/conf.d/20-redis.ini
ln -sf /etc/php/7.0/mods-available/redis.ini /etc/php/7.0/cli/conf.d/20-redis.ini
service php7.0-fpm restart
