Starting with CoreDNS

Wed, 27 Apr 2016 07:30:39 +0100

This post talks you through getting and setting up CoreDNS with a small zone file that it will serve. CoreDNS is a nameserver that is very flexible because it can chain different kinds of middleware. From the README:

CoreDNS aims to be a fast and flexible DNS server. The keyword here is flexible, with CoreDNS you are able to do what you want with your DNS data. And if not: write a middleware!

Writing CoreDNS Middleware

Fri, 25 Mar 2016 08:37:02 +0000

If it is not for me, give it to the next one.

Writing CoreDNS middleware consists out of four parts:

The actual middleware; the ServeDNS method that gets the request.
The setup part, the gets the Corefile configuration and creates the middleware.
Documentation.
Registration.

Note that part 1 and 2 also need tests!

Middleware

Let’s take a look at the chaos middleware that returns author and version information in the CH class. The main entry point for the whole thing is the Chaos structure. That structure holds some information and most importantly the Next middleware.Handler for chaining it to the next middleware:

Tutorial on Miek Gieben

Starting with CoreDNS

Writing CoreDNS Middleware

Middleware