---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: system:coredns
  labels:
    k8s-app: kube-dns
rules:
  - apiGroups: [""]
    resources:
      - endpoints
      - services
      - pods
      - namespaces
    verbs: ["list", "watch"]
  - apiGroups: ["discovery.k8s.io"]
    resources: ["endpointslices"]
    verbs: ["list", "watch"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: system:coredns
  labels:
    k8s-app: kube-dns
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: system:coredns
subjects:
  - kind: ServiceAccount
    name: coredns
    namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns
  namespace: kube-system
data:
  Corefile: |-
    .:53 {
        errors
        health {
            lameduck 5s
        }
        ready
        log . {
            class all
        }
        prometheus :9153

        # Return NODATA for AAAA on selected domains to force IPv4.
        template IN AAAA {
            match "(^|\.)huggingface\.co\.$"
            rcode NOERROR
            fallthrough
        }

        kubernetes homelab.lumpiasty.xyz cluster.local in-addr.arpa ip6.arpa {
            pods insecure
            fallthrough in-addr.arpa ip6.arpa
            ttl 30
        }
        forward . /etc/resolv.conf {
            max_concurrent 1000
        }
        cache 30 {
            disable success cluster.local
            disable denial cluster.local
        }
        loop
        reload
        loadbalance
    }
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/name: CoreDNS
spec:
  replicas: 1
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        k8s-app: kube-dns
    spec:
      priorityClassName: system-cluster-critical
      serviceAccountName: coredns
      tolerations:
        - key: node-role.kubernetes.io/control-plane
          operator: Exists
          effect: NoSchedule
      nodeSelector:
        kubernetes.io/os: linux
      containers:
        - name: coredns
          image: registry.k8s.io/coredns/coredns:v1.14.1
          imagePullPolicy: IfNotPresent
          args: ["-conf", "/etc/coredns/Corefile"]
          ports:
            - containerPort: 53
              name: dns
              protocol: UDP
            - containerPort: 53
              name: dns-tcp
              protocol: TCP
            - containerPort: 9153
              name: metrics
              protocol: TCP
          livenessProbe:
            httpGet:
              path: /health
              port: 8080
              scheme: HTTP
            initialDelaySeconds: 60
            timeoutSeconds: 5
            successThreshold: 1
            failureThreshold: 5
            periodSeconds: 10
          readinessProbe:
            httpGet:
              path: /ready
              port: 8181
              scheme: HTTP
            timeoutSeconds: 1
            successThreshold: 1
            failureThreshold: 3
            periodSeconds: 10
          resources:
            limits:
              memory: 170Mi
            requests:
              cpu: 0
              memory: 70Mi
          securityContext:
            allowPrivilegeEscalation: false
            capabilities:
              add:
                - NET_BIND_SERVICE
              drop:
                - ALL
            readOnlyRootFilesystem: true
          volumeMounts:
            - name: config-volume
              mountPath: /etc/coredns
              readOnly: true
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: coredns
            items:
              - key: Corefile
                path: Corefile
---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/name: CoreDNS
spec:
  type: ClusterIP
  clusterIP: 10.43.0.10
  clusterIPs:
    - 10.43.0.10
    - 2001:470:61a3:300::a
  ipFamilyPolicy: RequireDualStack
  ipFamilies:
    - IPv4
    - IPv6
  selector:
    k8s-app: kube-dns
  ports:
    - name: dns
      port: 53
      protocol: UDP
      targetPort: 53
    - name: dns-tcp
      port: 53
      protocol: TCP
      targetPort: 53