feat: add cronjob to scale sweeper

sweeper-chart/templates/cronjob-scale-to-one.yaml

@@ -0,0 +1,24 @@
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: {{ include "sweeper.fullname" . }}-scale-to-one
+spec:
+  schedule: {{ default "0 22 * * *" .Values.scaler.scaleToOne.schedule | quote }}
+  timeZone: {{ default "Europe/Rome" .Values.scaler.timeZone | quote }}
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          serviceAccountName: {{ include "sweeper.serviceAccountName" . }}
+          containers:
+            - name: scaler
+              image: alpine/kubectl:latest
+              command:
+                - /bin/sh
+                - -c
+                - |
+                  echo "Scaling {{ include "sweeper.fullname" . }} to 1 replica"
+                  kubectl scale deployment {{ include "sweeper.fullname" . }} \
+                    --replicas=1 \
+                    -n {{ .Release.Namespace }}
+          restartPolicy: OnFailure

sweeper-chart/templates/cronjob-scale-to-zero.yaml

@@ -0,0 +1,24 @@
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: {{ include "sweeper.fullname" . }}-scale-to-zero
+spec:
+  schedule: {{ default "0 6 * * *" .Values.scaler.scaleToZero.schedule | quote }}
+  timeZone: {{ default "Europe/Rome" .Values.scaler.timeZone | quote }}
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          serviceAccountName: {{ include "sweeper.serviceAccountName" . }}
+          containers:
+            - name: scaler
+              image: alpine/kubectl:latest
+              command:
+                - /bin/sh
+                - -c
+                - |
+                  echo "Scaling {{ include "sweeper.fullname" . }} to 0 replicas"
+                  kubectl scale deployment {{ include "sweeper.fullname" . }} \
+                    --replicas=0 \
+                    -n {{ .Release.Namespace }}
+          restartPolicy: OnFailure

sweeper-chart/templates/role.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: {{ include "sweeper.fullname" . }}-scaler
+  namespace: {{ .Release.Namespace }}
+rules:
+  - apiGroups: ["apps"]
+    resources: ["deployments"]
+    verbs: ["get"]
+  - apiGroups: ["apps"]
+    resources: ["deployments/scale"]
+    verbs: ["get", "update", "patch"]

sweeper-chart/templates/rolebinding.yaml

@@ -0,0 +1,13 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: {{ include "sweeper.fullname" . }}-scaler-binding
+  namespace: {{ .Release.Namespace }}
+subjects:
+  - kind: ServiceAccount
+    name: {{ include "sweeper.serviceAccountName" . }}
+    namespace: {{ .Release.Namespace }}
+roleRef:
+  kind: Role
+  name: {{ include "sweeper.fullname" . }}-scaler
+  apiGroup: rbac.authorization.k8s.io

sweeper-chart/values.yaml

@@ -168,4 +168,11 @@ env:
 etcd:
   service:
     name: eventsse-etcd
-    port: 2379
+    port: 2379
+
+scaler:
+  timeZone: "Europe/Rome"
+  scaleToZero:
+    schedule: "0 6 * * *"   # default: 06:00
+  scaleToOne:
+    schedule: "0 22 * * *"  # default: 22:00