fix(coredns): own Corefile+hostname rewrites via Talos inlineManifest (single-source terraform/files/coredns/Corefile), drop ArgoCD coredns-config app — in-cluster *.riotpiao.com now resolves to nginx ingress so MinIO/OIDC discovery works; update cp-2 IP .213->.214

k8s/argocd/apps/05-networking.yaml

@@ -20,24 +20,7 @@ spec:
     automated:
       prune: true
       selfHeal: true
----
+# coredns-config Application removed: CoreDNS (incl. homelab hostname rewrites)
-apiVersion: argoproj.io/v1alpha1
+# is owned by Talos via an inlineManifest (terraform/files/coredns/Corefile).
-kind: Application
+# Managing the coredns ConfigMap from ArgoCD too would let the two reconcilers
-metadata:
+# fight and revert the rewrites.
-  name: coredns-config
-  namespace: argocd
-  annotations:
-    argocd.argoproj.io/sync-wave: "0"
-spec:
-  project: homelab
-  source:
-    repoURL: [email protected]:Riotpiaole/riotpiao.homelab.com.git
-    targetRevision: main
-    path: k8s/bootstrap/coredns
-  destination:
-    server: https://kubernetes.default.svc
-    namespace: kube-system
-  syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true

k8s/bootstrap/coredns/coredns-configmap.yaml

@@ -1,78 +0,0 @@
-# k8s/coredns/coredns-configmap.yaml
-# Patches the CoreDNS Corefile to rewrite homelab hostnames to internal services.
-#
-# Why this is needed:
-#   Grafana v10+ does OIDC auto-discovery by fetching
-#   /.well-known/openid-configuration from Authentik. When Grafana reaches
-#   Authentik via the external hostname (authentik.riotpiao.com), the
-#   HTTP Host header is preserved and Authentik returns external URLs in the
-#   discovery response. Without this rewrite, the hostname doesn't resolve
-#   inside the cluster and Grafana falls back to the internal service DNS,
-#   causing all OAuth redirects to go to authentik-server.iam.svc.cluster.local.
-#
-# Applied by helmfile presync hook on the ingress-nginx release.
-
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: coredns
-  namespace: kube-system
-data:
-  Corefile: |
-    .:53 {
-        errors
-        health {
-            lameduck 5s
-        }
-        ready
-        log . {
-            class error
-        }
-        prometheus :9153
-
-        # VPN Access: Map api-server.cluster.local to cluster API IP
-        # Allows secure cluster access via WireGuard tunnel (Shadowrocket/Talos)
-        rewrite name api-server.cluster.local kubernetes.default.svc.cluster.local
-
-        # Forgejo: route through nginx ingress like every other host below. nginx
-        # terminates TLS (wildcard-tls) on :443 and routes both /v2/ (container
-        # registry) and web/git to forgejo-gitea-http:3000.
-        # Do NOT point this at forgejo-gitea-http directly: that service only serves
-        # port 3000, so containerd image pulls (which use https/:443) get
-        # `dial tcp <clusterIP>:443: i/o timeout`. SSH stays on its own LB service.
-        rewrite name forgejo.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name git.riotpiao.com forgejo-gitea-ssh.cicd.svc.cluster.local
-
-        # Rewrite homelab hostnames to the nginx ingress controller so in-cluster pods
-        # hit nginx TLS termination (cert-manager cert) and preserve the Host header.
-        # Routing through nginx — not directly to the backend service — is critical:
-        # direct rewrites to the backend bypass nginx TLS and expose each app's own
-        # self-signed cert, which nothing in the cluster trusts.
-        rewrite name authentik.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name grafana.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name minio.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name minio-api.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name argocd.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name vault.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name loki.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name prometheus.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name homarr.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name portainer.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-        rewrite name longhorn.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
-
-        kubernetes cluster.local in-addr.arpa ip6.arpa {
-            pods insecure
-            fallthrough in-addr.arpa ip6.arpa
-            ttl 30
-        }
-        forward . 8.8.8.8 1.1.1.1 {
-           max_concurrent 1000
-        }
-        cache 30 {
-           disable success cluster.local
-           disable denial cluster.local
-        }
-        loop
-        reload
-        loadbalance
-    }

k8s/bootstrap/coredns/coredns-deployment.yaml

@@ -1,130 +0,0 @@
-# CoreDNS is deployed by Talos's bootstrap manifests (not a helm release we
-# own). This tracks the full Deployment spec as the single source of truth
-# for any changes we apply on top of the Talos default — currently just
-# topologySpreadConstraints so the 2 replicas don't land on the same node.
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: coredns
-  namespace: kube-system
-  labels:
-    k8s-app: kube-dns
-    kubernetes.io/name: CoreDNS
-spec:
-  replicas: 2
-  revisionHistoryLimit: 10
-  selector:
-    matchLabels:
-      k8s-app: kube-dns
-  strategy:
-    rollingUpdate:
-      maxSurge: 25%
-      maxUnavailable: 1
-    type: RollingUpdate
-  template:
-    metadata:
-      labels:
-        k8s-app: kube-dns
-    spec:
-      affinity:
-        podAntiAffinity:
-          preferredDuringSchedulingIgnoredDuringExecution:
-            - podAffinityTerm:
-                labelSelector:
-                  matchExpressions:
-                    - key: k8s-app
-                      operator: In
-                      values:
-                        - kube-dns
-                topologyKey: kubernetes.io/hostname
-              weight: 100
-      containers:
-        - args:
-            - -conf
-            - /etc/coredns/Corefile
-          env:
-            - name: GOMEMLIMIT
-              value: 161MiB
-          image: registry.k8s.io/coredns/coredns:v1.14.2
-          imagePullPolicy: IfNotPresent
-          livenessProbe:
-            failureThreshold: 5
-            httpGet:
-              path: /health
-              port: 8080
-              scheme: HTTP
-            initialDelaySeconds: 60
-            periodSeconds: 10
-            successThreshold: 1
-            timeoutSeconds: 5
-          name: coredns
-          ports:
-            - containerPort: 53
-              name: dns
-              protocol: UDP
-            - containerPort: 53
-              name: dns-tcp
-              protocol: TCP
-            - containerPort: 9153
-              name: metrics
-              protocol: TCP
-          readinessProbe:
-            failureThreshold: 3
-            httpGet:
-              path: /ready
-              port: 8181
-              scheme: HTTP
-            periodSeconds: 10
-            successThreshold: 1
-            timeoutSeconds: 1
-          resources:
-            limits:
-              memory: 170Mi
-            requests:
-              cpu: 100m
-              memory: 70Mi
-          securityContext:
-            allowPrivilegeEscalation: false
-            capabilities:
-              add:
-                - NET_BIND_SERVICE
-              drop:
-                - ALL
-            readOnlyRootFilesystem: true
-          terminationMessagePath: /dev/termination-log
-          terminationMessagePolicy: File
-          volumeMounts:
-            - mountPath: /etc/coredns
-              name: config-volume
-              readOnly: true
-      dnsPolicy: Default
-      nodeSelector:
-        kubernetes.io/os: linux
-      priorityClassName: system-cluster-critical
-      restartPolicy: Always
-      schedulerName: default-scheduler
-      serviceAccount: coredns
-      serviceAccountName: coredns
-      terminationGracePeriodSeconds: 30
-      tolerations:
-        - effect: NoSchedule
-          key: node-role.kubernetes.io/control-plane
-          operator: Exists
-        - effect: NoSchedule
-          key: node.cloudprovider.kubernetes.io/uninitialized
-          operator: Exists
-      topologySpreadConstraints:
-        - labelSelector:
-            matchLabels:
-              k8s-app: kube-dns
-          maxSkew: 1
-          topologyKey: kubernetes.io/hostname
-          whenUnsatisfiable: ScheduleAnyway
-      volumes:
-        - configMap:
-            defaultMode: 420
-            items:
-              - key: Corefile
-                path: Corefile
-            name: coredns
-          name: config-volume

k8s/bootstrap/coredns/kustomization.yaml

@@ -1,5 +0,0 @@
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-namespace: kube-system
-resources: []
-# CoreDNS deployed via Helm chart

terraform/files/coredns/Corefile

@@ -0,0 +1,52 @@
+.:53 {
+    errors
+    health {
+        lameduck 5s
+    }
+    ready
+    log . {
+        class error
+    }
+    prometheus :9153
+
+    # VPN access: map api-server.cluster.local to the cluster API service.
+    rewrite name api-server.cluster.local kubernetes.default.svc.cluster.local
+
+    # Forgejo: route through nginx ingress (TLS on :443, /v2/ registry + web).
+    # Do NOT point at forgejo-gitea-http directly (port 3000 only) — image pulls
+    # use https/:443 and would time out. SSH stays on its own LB service.
+    rewrite name forgejo.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name git.riotpiao.com forgejo-gitea-ssh.cicd.svc.cluster.local
+
+    # Homelab hostnames -> nginx ingress controller so in-cluster pods hit nginx
+    # TLS termination (cert-manager cert) and preserve the Host header. Routing
+    # via nginx (not the backend service) is critical: a direct rewrite bypasses
+    # nginx TLS and exposes each app's own self-signed cert, trusted by nothing.
+    rewrite name authentik.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name grafana.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name minio.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name minio-api.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name argocd.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name vault.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name loki.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name prometheus.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name homarr.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name portainer.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+    rewrite name longhorn.riotpiao.com ingress-nginx-controller.ingress-nginx.svc.cluster.local
+
+    kubernetes cluster.local in-addr.arpa ip6.arpa {
+        pods insecure
+        fallthrough in-addr.arpa ip6.arpa
+        ttl 30
+    }
+    forward . 8.8.8.8 1.1.1.1 {
+       max_concurrent 1000
+    }
+    cache 30 {
+       disable success cluster.local
+       disable denial cluster.local
+    }
+    loop
+    reload
+    loadbalance
+}

terraform/main.tf

@@ -41,6 +41,7 @@ resource "local_file" "controlplane_configs" {
     forgejo_hostname    = var.forgejo_hostname
     zone                = each.value.zone
     allow_scheduling    = each.value.allow_scheduling
+    coredns_corefile    = file("${path.module}/files/coredns/Corefile")
 
     # Cloudflare Tunnel cert SANs (talos :50000 and kube-apiserver :6443)
     cloudflare_talos_sans     = each.value.cloudflare_talos_sans

terraform/templates/controlplane.tftpl

@@ -164,3 +164,18 @@ cluster:
         kind: Namespace
         metadata:
           name: kube-system
+    # CoreDNS Corefile with homelab hostname rewrites (single source of truth in
+    # terraform/files/coredns/Corefile). In-cluster pods resolve *.riotpiao.com to
+    # the nginx ingress controller so OIDC auto-discovery against
+    # authentik.riotpiao.com works and the Host header is preserved. Owned by
+    # Talos — do NOT also manage the coredns ConfigMap via ArgoCD.
+    - name: coredns-config
+      contents: |
+        apiVersion: v1
+        kind: ConfigMap
+        metadata:
+          name: coredns
+          namespace: kube-system
+        data:
+          Corefile: |
+            ${indent(12, coredns_corefile)}