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Variables

var (
	Coredns = template.Must(template.New("coredns.yaml").Parse(
		dedent.Dedent(`---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    addonmanager.kubernetes.io/mode: Reconcile
  name: system:coredns
rules:
- apiGroups:
  - ""
  resources:
  - endpoints
  - services
  - pods
  - namespaces
  verbs:
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - get
- apiGroups:
  - discovery.k8s.io
  resources:
  - endpointslices
  verbs:
  - list
  - watch

---
apiVersion: v1
kind: Service
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    kubernetes.io/name: "CoreDNS"
    addonmanager.kubernetes.io/mode: Reconcile
  annotations:
    prometheus.io/port: "9153"
    prometheus.io/scrape: "true"
    createdby: 'kubekey'
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: {{ .ClusterIP }}
  ports:
    - name: dns
      port: 53
      protocol: UDP
    - name: dns-tcp
      port: 53
      protocol: TCP
    - name: metrics
      port: 9153
      protocol: TCP

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: "coredns"
  namespace: kube-system
  labels:
    k8s-app: "kube-dns"
    addonmanager.kubernetes.io/mode: Reconcile
    kubernetes.io/name: "coredns"
spec:
  strategy:
    type: RollingUpdate
    rollingUpdate:
      maxUnavailable: 0
      maxSurge: 10%
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        k8s-app: kube-dns
      annotations:
        createdby: 'kubekey'
    spec:
      securityContext:
        seccompProfile:
          type: RuntimeDefault
      priorityClassName: system-cluster-critical
      serviceAccountName: coredns
      nodeSelector:
        kubernetes.io/os: linux
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
        - key: node-role.kubernetes.io/control-plane
          effect: NoSchedule
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            podAffinityTerm:
              labelSelector:
                matchLabels:
                  k8s-app: kube-dns
              topologyKey: "kubernetes.io/hostname"
        nodeAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            preference:
              matchExpressions:
              - key: node-role.kubernetes.io/control-plane
                operator: In
                values:
                - ""
      containers:
      - name: coredns
        image: "{{ .CorednsImage }}"
        imagePullPolicy: IfNotPresent
        resources:
          # TODO: Set memory limits when we've profiled the container for large
          # clusters, then set request = limit to keep this container in
          # guaranteed class. Currently, this container falls into the
          # "burstable" category so the kubelet doesn't backoff from restarting it.
          limits:
            memory: 300Mi
          requests:
            cpu: 100m
            memory: 70Mi
        args: [ "-conf", "/etc/coredns/Corefile" ]
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9153
          name: metrics
          protocol: TCP
        securityContext:
          allowPrivilegeEscalation: false
          capabilities:
            add:
            - NET_BIND_SERVICE
            drop:
            - all
          readOnlyRootFilesystem: true
        livenessProbe:
          httpGet:
            path: /health
            port: 8080
            scheme: HTTP
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 10
        readinessProbe:
          httpGet:
            path: /ready
            port: 8181
            scheme: HTTP
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 10
      dnsPolicy: Default
      volumes:
        - name: config-volume
          configMap:
            name: coredns
            items:
            - key: Corefile
              path: Corefile
{{ if .DNSEtcHosts }}
            - key: hosts
              path: hosts
{{ end }}

    `)))
)

var (
	CorednsConfigMap = template.Must(template.New("coredns-configmap.yaml").Funcs(utils.FuncMap).Parse(
		dedent.Dedent(`---
apiVersion: v1
kind: ConfigMap
metadata:
  name: coredns
  namespace: kube-system
  labels:
      addonmanager.kubernetes.io/mode: EnsureExists
data:
  Corefile: |
{{- if .ExternalZones }}
{{- range .ExternalZones }}
{{ range .Zones }}{{ . | indent 4 }} {{ end }}{
        log
        errors
{{- if .Rewrite }}
{{- range .Rewrite }}
        rewrite {{ . }}
{{- end }}
{{- end }}
        forward .{{ range .Nameservers }} {{ . }}{{ end}}
        loadbalance
        cache {{ .Cache }}
        reload
{{- if $.DNSEtcHosts }}
        hosts /etc/coredns/hosts {
          fallthrough
        }
{{- end }}
    }
{{- end }}
{{- end }}
    .:53 {
{{- if .AdditionalConfigs }}
{{  .AdditionalConfigs | indent 8 }}
{{- end }}
        errors
        health {
          lameduck 5s
        }
{{- if .RewriteBlock }}
{{ .RewriteBlock | indent 8 }}
{{- end }}
        ready
        kubernetes {{ .ClusterDomain }} in-addr.arpa ip6.arpa {
          pods insecure
          fallthrough in-addr.arpa ip6.arpa
          ttl 30
        }
        prometheus :9153
        forward . {{ if .UpstreamDNSServers }}{{ range .UpstreamDNSServers }}{{ . }} {{ end }}{{else}}/etc/resolv.conf{{ end }} {
          prefer_udp
          max_concurrent 1000
        }
        cache 30
        loop
        reload
        loadbalance
{{- if .DNSEtcHosts }}
        hosts /etc/coredns/hosts {
          fallthrough
        }
{{- end }}
    }
{{- if .DNSEtcHosts }}
  hosts: |
{{ .DNSEtcHosts | indent 4 }}
{{- end }}

    `)))
)

var NodeLocalDNSConfigMap = template.Must(template.New("nodelocaldns-configmap.yaml").Funcs(utils.FuncMap).Parse(
	dedent.Dedent(`---
apiVersion: v1
kind: ConfigMap
metadata:
  name: nodelocaldns
  namespace: kube-system
  labels:
    addonmanager.kubernetes.io/mode: EnsureExists

data:
  Corefile: |
{{- if .ExternalZones }}
{{- range .ExternalZones }}
{{ range .Zones }}{{ . | indent 4 }} {{ end}} {
        errors
        cache {{ .Cache }}
        reload
{{- if .Rewrite }}
{{- range .Rewrite }}
        rewrite {{ . }}
{{- end }}
{{- end }}
        loop
        bind 169.254.25.10
        forward . {{ range .Nameservers }} {{ . }}{{ end }}
        prometheus :9253
        log
{{- if $.DNSEtcHosts }}
        hosts /etc/coredns/hosts {
          fallthrough
        }
{{- end }}
    }
{{- end }}
{{- end }}
    {{ .DNSDomain }}:53 {
        errors
        cache {
            success 9984 30
            denial 9984 5
        }
        reload
        loop
        bind 169.254.25.10
        forward . {{ .ForwardTarget }} {
            force_tcp
        }
        prometheus :9253
        health 169.254.25.10:9254
    }
    in-addr.arpa:53 {
        errors
        cache 30
        reload
        loop
        bind 169.254.25.10
        forward . {{ .ForwardTarget }} {
            force_tcp
        }
        prometheus :9253
    }
    ip6.arpa:53 {
        errors
        cache 30
        reload
        loop
        bind 169.254.25.10
        forward . {{ .ForwardTarget }} {
            force_tcp
        }
        prometheus :9253
    }
    .:53 {
        errors
        cache 30
        reload
        loop
        bind 169.254.25.10
        forward . /etc/resolv.conf
        prometheus :9253
{{- if .DNSEtcHosts }}
        hosts /etc/coredns/hosts {
          fallthrough
        }
{{- end }}
    }
{{- if .DNSEtcHosts }}
  hosts: |
{{ .DNSEtcHosts | indent 4}}
{{- end }}
`)))

var NodeLocalDNSService = template.Must(template.New("nodelocaldns.yaml").Parse(
	dedent.Dedent(`---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nodelocaldns
  namespace: kube-system
  labels:
    addonmanager.kubernetes.io/mode: Reconcile

---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: nodelocaldns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  selector:
    matchLabels:
      k8s-app: nodelocaldns
  template:
    metadata:
      labels:
        k8s-app: nodelocaldns
      annotations:
        prometheus.io/scrape: 'true'
        prometheus.io/port: '9253'
    spec:
      nodeSelector:
        kubernetes.io/os: linux
      priorityClassName: system-cluster-critical
      serviceAccountName: nodelocaldns
      hostNetwork: true
      dnsPolicy: Default  # Don't use cluster DNS.
      tolerations:
      - effect: NoSchedule
        operator: "Exists"
      - effect: NoExecute
        operator: "Exists"
      - key: "CriticalAddonsOnly"
        operator: "Exists"
      containers:
      - name: node-cache
        image: {{ .NodelocaldnsImage }}
        resources:
          limits:
            memory: 200Mi
          requests:
            cpu: 100m
            memory: 70Mi
        args: [ "-localip", "169.254.25.10", "-conf", "/etc/coredns/Corefile", "-upstreamsvc", "coredns" ]
        securityContext:
          privileged: true
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        - containerPort: 9253
          name: metrics
          protocol: TCP
        livenessProbe:
          httpGet:
            host: 169.254.25.10
            path: /health
            port: 9254
            scheme: HTTP
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 10
        readinessProbe:
          httpGet:
            host: 169.254.25.10
            path: /health
            port: 9254
            scheme: HTTP
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 10
        volumeMounts:
        - name: config-volume
          mountPath: /etc/coredns
        - name: xtables-lock
          mountPath: /run/xtables.lock
      volumes:
        - name: config-volume
          configMap:
            name: nodelocaldns
            items:
            - key: Corefile
              path: Corefile
{{- if .DNSEtcHosts }}
            - key: hosts
              path: hosts
{{ end }}
        - name: xtables-lock
          hostPath:
            path: /run/xtables.lock
            type: FileOrCreate
      # Minimize downtime during a rolling upgrade or deletion; tell Kubernetes to do a "force
      # deletion": https://kubernetes.io/docs/concepts/workloads/pods/pod/#termination-of-pods.
      terminationGracePeriodSeconds: 0
  updateStrategy:
    rollingUpdate:
      maxUnavailable: 20%
    type: RollingUpdate

    `)))