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Deployment

Deploying coredns-sidecar requires the following modifications to an existing CoreDNS installation:

  1. add the sidecar to the CoreDNS deployment (see this patch that can be applied running kubectl patch --namespace kube-system deploy coredns --patch "$(cat coredns-deploy-patch.yml)")
  2. expand existing RBAC rules for CoreDNS to permit listing and watching nodes
  3. amend the CoreDNS Corefile by a piece of configuration for the hosts plugin:
hosts /shared/hosts {
    ttl 5
    fallthrough
}

fallthrough is needed so that lookups which cannot be fulfilled by the hosts file get relayed to other resolution mechanisms provided by CoreDNS. tls can be adjusted per your own discretion.