Howdy, I'm trying to modify coredns to forward upstream request to a specific server, but that setting doesn't seem to stick reliably. I'm looking at the modifications using a configmap called coredns-custom. I see a few issues regarding this, but I've not seen documentation. Is there something more needed than creating the configmap? Perhaps mounting it within the container?

I thought the ConfigMap should be there already. A coworker was the one that fixed it when we had a problem with recent Ubuntu having a localhost DNS & things not getting forwarded, but his notes say: 'The config map in kube-system coredns has a section including "forward . /etc/resolv.conf" change that to "forward . /etc/resolv.conf ${DNS_IP}" '

It seems very dependent on when you apply the change. If applied too early, it seems to get overridden.