Updated to use CoreDNS

microk8s-resources/actions/coredns.yaml

@@ -0,0 +1,161 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: coredns
+  namespace: kube-system
+  labels:
+    k8s-app: kube-dns
+    kubernetes.io/cluster-service: "true"
+    addonmanager.kubernetes.io/mode: Reconcile
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: coredns
+  namespace: kube-system
+  labels:
+    addonmanager.kubernetes.io/mode: EnsureExists
+    k8s-app: kube-dns
+data:
+  Corefile: |
+    .:53 {
+        errors
+        health
+        ready
+        kubernetes cluster.local in-addr.arpa ip6.arpa {
+          pods insecure
+          fallthrough in-addr.arpa ip6.arpa
+        }
+        prometheus :9153
+        forward . 8.8.8.8 8.8.4.4
+        cache 30
+        loop
+        reload
+        loadbalance
+    }
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: coredns
+  namespace: kube-system
+  labels:
+    k8s-app: kube-dns
+    kubernetes.io/name: "CoreDNS"
+    kubernetes.io/cluster-service: "true"
+    addonmanager.kubernetes.io/mode: Reconcile
+spec:
+  # replicas: not specified here:
+  # 1. In order to make Addon Manager do not reconcile this replicas parameter.
+  # 2. Default is 1.
+  # 3. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: 10%
+      maxUnavailable: 0
+  selector:
+    matchLabels:
+      k8s-app: kube-dns
+  template:
+    metadata:
+      labels:
+        k8s-app: kube-dns
+      annotations:
+        scheduler.alpha.kubernetes.io/critical-pod: ''
+    spec:
+      priorityClassName: system-cluster-critical
+      serviceAccountName: coredns
+      tolerations:
+        - key: "CriticalAddonsOnly"
+          operator: "Exists"
+      volumes:
+        - name: config-volume
+          configMap:
+            name: coredns
+            items:
+            - key: Corefile
+              path: Corefile
+      containers:
+      - name: coredns
+        image: coredns/coredns:1.5.0
+        imagePullPolicy: IfNotPresent
+        resources:
+          limits:
+            memory: 170Mi
+          requests:
+            cpu: 100m
+            memory: 70Mi
+        args: [ "-conf", "/etc/coredns/Corefile" ]
+        volumeMounts:
+        - name: config-volume
+          mountPath: /etc/coredns
+          readOnly: true
+        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
+          initialDelaySeconds: 60
+          timeoutSeconds: 5
+          successThreshold: 1
+          failureThreshold: 5
+        readinessProbe:
+          httpGet:
+            path: /ready
+            port: 8181
+            scheme: HTTP
+      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
+  annotations:
+    prometheus.io/port: "9153"
+    prometheus.io/scrape: "true"
+  labels:
+    k8s-app: kube-dns
+    kubernetes.io/cluster-service: "true"
+    kubernetes.io/name: "CoreDNS"
+    addonmanager.kubernetes.io/mode: Reconcile
+spec:
+  selector:
+    k8s-app: kube-dns
+  clusterIP: 10.152.183.10
+  ports:
+  - name: dns
+    port: 53
+    protocol: UDP
+  - name: dns-tcp
+    port: 53
+    protocol: TCP
+  - name: metrics
+    port: 9153
+    protocol: TCP

microk8s-resources/actions/disable.dns.sh

@@ -11,7 +11,15 @@ KUBECTL="$SNAP/kubectl --kubeconfig=$SNAP/client.config"
 # Delete the dns yaml
 # We need to wait for the dns pods to terminate before we restart kubelet
 echo "Removing DNS manifest"
-use_manifest dns delete
+pods_sys="$($KUBECTL get po -n kube-system 2>&1)"
+if echo "$pods_sys" | grep "kube-dns" &> /dev/null 
+then
+  use_manifest dns delete
+fi
+if echo "$pods_sys" | grep "coredns" &> /dev/null
+then
+  use_manifest coredns delete
+fi
 sleep 15
 timeout=30
 start_timer="$(date +%s)"

microk8s-resources/actions/enable.dns.sh

@@ -8,7 +8,7 @@ source $SNAP/actions/common/utils.sh
 # We do not need to see dns pods running at this point just give some slack
 echo "Enabling DNS"
 echo "Applying manifest"
-use_manifest dns apply
+use_manifest coredns apply
 sleep 5
 
 echo "Restarting kubelet"

microk8s-resources/wrappers/microk8s-status.wrapper

@@ -11,7 +11,7 @@ KUBECTL="$SNAP/kubectl --kubeconfig=$SNAP/client.config"
 
 # Arrray of what we query per addon
 declare -A addon
-addon[dns]="pod/kube-dns"
+addon[dns]="pod/coredns"
 addon[rbac]="clusterrole.rbac.authorization.k8s.io/cluster-admin"
 addon[dashboard]="pod/kubernetes-dashboard"
 addon[ingress]="pod/nginx-ingress-microk8s-controller"