# CoreDNS adoption

The upstream CoreDNS chart is reconciled by Argo CD. It preserves the
`kube-system/coredns` Deployment selector, the
`kube-dns` Service name and `10.96.0.10` ClusterIP, the current image tag,
Corefile behavior, two ODROID replicas, and the existing PDB selector.

The first no-prune sync was validated with two ready DNS endpoints and working
UDP/TCP lookups. The chart uses different port names and additional Pod
labels/security settings, so its initial adoption rolled the DNS pods; the
Service UID and `10.96.0.10` ClusterIP stayed unchanged. The separate
`prometheus-kube-prometheus-coredns` Service still serves metrics on 9153.
The existing `system:coredns` RBAC and `coredns` ServiceAccount remain owned by
Kubernetes bootstrap; this chart intentionally does not render replacements.

Pruning stays disabled for this cluster-critical service. The historical
`coredns-deployment` direct-CD workflow and kubeconfig/RBAC are retired after
Argo adoption; the deployment-only repository is archived.