Merge pull request #37 from fahad-rauf/add-hpa

Add hpa support

README.md

@@ -108,3 +108,9 @@ To uninstall the chart:
 | serviceMonitor.annotations | Annotations for serviceMonitor | `{}` |
 | serviceMonitor.jobLabel | Job Label used for application selector | `k8s-app` |
 | serviceMonitor.endpoints | Array of endpoints to be scraped by prometheus |   - interval: 5s<br>&nbsp;&nbsp;path: /actuator/prometheus<br>&nbsp;&nbsp;port: http |
+| autoscaling.enabled | Enable horizontal pod autoscaler | `false` |
+| autoscaling.additionalLabels | Labels for horizontal pod autoscaler | `{}` |
+| autoscaling.annotations | Annotations for horizontal pod autoscaler | `{}` |
+| autoscaling.minReplicas | Sets minimum replica count when autoscaling is enabled | `1` |
+| autoscaling.maxReplicas | Sets maximum replica count when autoscaling is enabled | `10` |
+| autoscaling.metrics | Configuration for hpa metrics, set when autoscaling is enabled | `{}` |

application/templates/hpa.yaml

@@ -0,0 +1,25 @@
+{{- if and .Values.autoscaling.enabled .Values.deployment }}
+apiVersion: autoscaling/v2beta2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ template "application.name" . }}
+  labels:
+    {{ include "application.labels.stakater" . | nindent 4 }}
+    {{ include "application.labels.chart" . | nindent 4 }}
+  {{- if .Values.autoscaling.additionalLabels }}
+    {{- toYaml .Values.autoscaling.additionalLabels | nindent 4 }}
+  {{- end }}
+  {{- if .Values.autoscaling.annotations }}
+  annotations:
+    {{- toYaml .Values.autoscaling.annotations | nindent 4 }}
+  {{- end }}    
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ template "application.name" . }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  metrics:
+    {{- toYaml .Values.autoscaling.metrics | nindent 4 }}
+{{- end }}    

application/values.yaml

@@ -363,4 +363,29 @@ serviceMonitor:
   endpoints:
   - interval: 5s
     path: /actuator/prometheus
-    port: http
+    port: http
+
+# autoscaling is used for horizonal pod autoscaling
+autoscaling:
+# enabled is a boolean flag for enabling or disabling autoscaling 
+  enabled: false
+# additionalLabels defines additional labels
+  additionalLabels: 
+    # key: value
+# annotations defines annotations in key value pair
+  annotations: 
+    # key: value
+# minReplicas sets the minimum number of replicas
+  minReplicas: 1
+# maxReplicas sets the maximum number of replicas
+  maxReplicas: 10
+# metrics is the list of metrics used for hpa
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      targetAverageUtilization: 60
+  - type: Resource
+    resource:
+      name: memory
+      targetAverageUtilization: 60