terraform-talos/aws/deployments/coredns-local.yaml

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns-local
  namespace: kube-system
data:
  empty.db: |
    @       60      IN      SOA     localnet. root.localnet. (
                    1       ; serial
                    60      ; refresh
                    60      ; retry
                    60      ; expiry
                    60 )    ; minimum
    ;
    @       IN      NS      localnet.

  hosts: |
    # static hosts
    169.254.2.53        dns.local

  Corefile.local: |
    (empty) {
        file /etc/coredns/empty.db
    }

    .:53 {
        errors
        bind 169.254.2.53

        health 127.0.0.1:8091 {
           lameduck 5s
        }

        hosts /etc/coredns/hosts {
            reload 60s
            fallthrough
        }

        kubernetes cluster.local in-addr.arpa ip6.arpa {
            endpoint https://api.cluster.local:6443
            kubeconfig /etc/coredns/kubeconfig.conf coredns
            pods insecure
            ttl 60
        }
        prometheus :9153

        forward . /etc/resolv.conf {
            policy sequential
            expire 30s
        }

        cache 300
        loop
        reload
        loadbalance
    }
  kubeconfig.conf: |-
    apiVersion: v1
    kind: Config
    clusters:
    - cluster:
        certificate-authority: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        server: https://api.cluster.local:6443
      name: default
    contexts:
    - context:
        cluster: default
        namespace: kube-system
        user: coredns
      name: coredns
    current-context: coredns
    users:
    - name: coredns
      user:
        tokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: coredns-local
  namespace: kube-system
  labels:
    k8s-app: kube-dns-local
    kubernetes.io/name: CoreDNS
spec:
  updateStrategy:
    type: RollingUpdate
  minReadySeconds: 15
  selector:
    matchLabels:
      k8s-app: kube-dns-local
      kubernetes.io/name: CoreDNS
  template:
    metadata:
      labels:
        k8s-app: kube-dns-local
        kubernetes.io/name: CoreDNS
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "9153"
    spec:
      priorityClassName: system-node-critical
      serviceAccount: coredns
      serviceAccountName: coredns
      enableServiceLinks: false
      tolerations:
      - effect: NoSchedule
        key: node-role.kubernetes.io/control-plane
        operator: Exists
      - effect: NoSchedule
        key: node.cloudprovider.kubernetes.io/uninitialized
        operator: Exists
      hostNetwork: true
      containers:
      - name: coredns
        image: coredns/coredns:1.9.4
        imagePullPolicy: IfNotPresent
        resources:
          limits:
            cpu: 100m
            memory: 128Mi
          requests:
            cpu: 50m
            memory: 64Mi
        args: [ "-conf", "/etc/coredns/Corefile.local" ]
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
          readOnly: true
        livenessProbe:
          httpGet:
            host: 127.0.0.1
            path: /health
            port: 8091
            scheme: HTTP
          initialDelaySeconds: 60
          periodSeconds: 10
          successThreshold: 1
          timeoutSeconds: 5
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_BIND_SERVICE
            drop:
            - all
          readOnlyRootFilesystem: true
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: coredns-local