tree f39c24f681176b7bbf36fe6af304c6902124f552
parent 4efaa019244db96128941965aa72c0e1371b0d2d
author Lorenz Brun <lorenz@nexantic.com> 1601292732 +0200
committer Lorenz Brun <lorenz@nexantic.com> 1601292732 +0200

Use CoreDNS for everything and make directives dynamic

This moves CoreDNS from Kubernetes to the network tree and uses
it for OS-side resolution too. For this to work together with Kubernetes it now
contains a dynamic directive system which allows various parts of the OS
to register and unregister directives at runtime. This system is used to hook
Kubernetes and DHCP-supplied DNS servers into the configuration.

This also enables the hosts plugin to resolve the local hostname from within
CoreDNS to avoid querying external DNS servers for that (T773).

Test Plan:
CTS covers K8s-related tests, external resolution manually tested from
a container.

Bug: T860, T773

X-Origin-Diff: phab/D628
GitOrigin-RevId: f1729237f3d17d8801506f4d299b90e7dce0893a