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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.