How to make a CDN based on nginx?

Question

Nginx

Good day.
There is a task to construct CDN.
In my opinion, there are several ways that can be used:
1. PHP script on top of httpd, which will redirect the user to the desired node.
2. C-daemon that will act as httpd and will redirect the user to the desired node.

Perhaps it's not worth reinventing the wheel and nginx has a module that would do a good job with this. Naturally, it is desirable that he take data from mysql, so it will be more convenient.

Actually questions:
1. Which method is better to use?
2. Is there a magic module for some httpd?
3. Perhaps there is a best practice for creating a CDN and you know about it? I would be grateful for a hint, link, tip and any other useful information.

Answer 1

www.youtube.com/watch?v=K9wIp8OnfeE
Andrey Alekseev, Maxim Konovalov — Nginx, Inc.

Answer 2

Several rewrite rules will be able to redirect the user to the desired node, for the balancer you can take another haproxy, but otherwise you need to decide the structure of your cdn on your own based on the task.