[Redis] How to use redis in symfony

Redis

https://www.linode.com/docs/databases/redis/install-and-configure-redis-on-centos-7

introduce

http://blog.techbridge.cc/2016/06/18/redis-introduction/

SETTING

https://github.com/snc/SncRedisBundle/blob/master/Resources/doc/index.md

https://www.slideshare.net/ricardclau/speed-up-your-symfony2-application-and-build-awesome-features-with-redis