f795128f21
Given the volume and ephemeral nature of the nodes we are running jobs on, we're interested in raising the minimum TTL to ensure we're not needlessly querying domains all the time. Some domains such as github.com or fedoraproject.org have low TTLs and we suspect there is a correlation between their low TTLs and the fact that we're seeing increased DNS lookup rates for these domains. Change-Id: I6d9656cb07a694fc2f54f256a63af814c034ffb8
An ansible role to dynamically configure DNS forwarders for the
unbound caching service. IPv6 will be preferred when there
is a usable IPv6 default route, otherwise IPv4.
Note
This is not a standalone unbound configuration role. Base setup is
done during image builds in
project-config:nodepool/elements/nodepool-base/finalise.d/89-unbound;
here we just do dynamic configuration of forwarders based on the
interfaces available on the actual host.
Role Variables