Deploy rails app

I want to deploy rails app in OS centos 7, with Nginx, Unicorn and Capistrano so which guide or tutorials is best for deploying rails app ???

? "best" depends on your background, learning style, etc. -- have you
read the Capistrano docs? Do you have specific questions?

For the server side Digitalocean got some good ones like

For capistrano, the docs are great, google, stackoverflow… but yeah post any specific questions.

Big thrums up for Digitalocean, great set of howtos.

Why not use docker?