Caching in CoreDNS

Wed, 20 Apr 2016 07:54:08 +0100

In the last couple of evenings I’ve implemented a caching middleware in CoreDNS. It has a only a few knobs and should be simple to use.

Take a simple Corefile and add caching, via the cache directive.

.:1053 {
    proxy . 8.8.4.4:53
    cache 10 miek.nl
    log stdout
    errors stdout
}

Which defines CoreDNS to be a proxy, and only cache responses for the miek.nl zone. This cache only caches for up to 10 seconds. Lets send some queries and looks at the logs:

Caching on Miek Gieben

Caching in CoreDNS