Where are kube-dns command-line / configmap parameters documented?

I miss a short reference doc like the one here for kubernetes dashboard: https://github.com/kubernetes/dashboard/wiki/Dashboard-arguments

I could (just) look into the code, but even when doing that, the relation between names of cmdline flags vs. configmap param names vs. file param names are not obvious?

And.. What is the preferred way to configure kube-dns? ConfigMap, config file or cmdline arguments, and if doing both, which method has priority over the other?

This question applies to all the standard containers in the kube-dns pod. (kube-dns | sidecar | dnsmasq)