laravel 5.4 redis server ddos attack

i setup laravel 5.4 app with redis server i got some ddos attack on my server and i got my redis server cache unknow info. like "some-email|some-ip". here screenshoot : enter image description here

i was changed old port, and set require password.also changed redis folder permissions. but still get this info's. my server is ubuntu 16 with nginx,node.js,php7 and redis server(phpredis).

how to secure my server from ddos attack?

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