add pihole with keepalived for backup

clusters/default/tools/pihole/pihole-cm.yml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: keepalived-config
+  namespace: tools
+data:
+  keepalived.conf: |
+    vrrp_instance PIHOLE_VIP {
+      state BACKUP
+      interface eth0
+      virtual_router_id 212
+      priority 100
+      advert_int 1
+
+      virtual_ipaddress {
+        192.168.1.212/24
+      }
+    }

clusters/default/tools/pihole/pihole-pvc.yml

@@ -0,0 +1,14 @@
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: pihole-longhorn
+  namespace: tools
+spec:
+  accessModes:
+    - ReadWriteMany
+  volumeMode: Filesystem
+  resources:
+    requests:
+      storage: 1Gi
+  storageClassName: longhorn

clusters/default/tools/pihole/pihole.yml

@@ -0,0 +1,81 @@
+---
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: pihole-backup
+  namespace: tools
+spec:
+  selector:
+    matchLabels:
+      app: pihole
+  template:
+    metadata:
+      labels:
+        app: pihole
+    spec:
+      hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
+
+      initContainers:
+      - name: init-keepalived
+        image: osixia/keepalived:2.0.20
+        command:
+          - sh
+          - -c
+          - |
+            cp -r /container/service/keepalived/assets/* /etc/keepalived/
+            cp /config/keepalived.conf /etc/keepalived/keepalived.conf
+        volumeMounts:
+          - name: keepalived-config
+            mountPath: /config
+          - name: keepalived-runtime
+            mountPath: /etc/keepalived
+
+      containers:
+      - name: pihole
+        image: pihole/pihole:latest
+        securityContext:
+          capabilities:
+            add: ["NET_ADMIN"]
+        env:
+          - name: TZ
+            value: "Asia/Kolkata"
+          - name: FTLCONF_webserver_api_password
+            valueFrom:
+              secretKeyRef:
+                name: pihole-webpassword
+                key: password
+        ports:
+          - containerPort: 53
+            protocol: UDP
+          - containerPort: 53
+            protocol: TCP
+          - containerPort: 67
+            protocol: UDP
+          - containerPort: 80
+            protocol: TCP
+        volumeMounts:
+          - name: pihole-data
+            mountPath: /etc/pihole
+
+      - name: keepalived
+        image: osixia/keepalived:2.0.20
+        securityContext:
+          capabilities:
+            add: ["NET_ADMIN", "NET_BROADCAST", "NET_RAW"]
+
+        volumeMounts:
+          - name: keepalived-runtime
+            mountPath: /container/service/keepalived/assets
+
+      volumes:
+      - name: keepalived-config
+        configMap:
+          name: keepalived-config
+
+      - name: keepalived-runtime
+        emptyDir: {}
+
+      - name: pihole-data
+        persistentVolumeClaim:
+          claimName: pihole-longhorn