Added support for autoscaling using hpa

README.md

@@ -61,6 +61,12 @@ their default values.
 | `podDisruptionBudget`       | Pod disruption budget                                                                      | `{}`            |
 | `resources.limits.cpu`      | Container requested CPU                                                                    | `nil`           |
 | `resources.limits.memory`   | Container requested memory                                                                 | `nil`           |
+| `autoscaling.enabled`       | Enable autoscaling using HorizontalPodAutoscaler                                           | `false`         |
+| `autoscaling.minReplicas`   | Minimal number of replicas                                                                 | `1`             |
+| `autoscaling.maxReplicas`   | Maximal number of replicas                                                                 | `2`             |
+| `autoscaling.targetCPUUtilizationPercentage` | Target average utilization of CPU on Pods                                 | `60`            |
+| `autoscaling.targetMemoryUtilizationPercentage` | (Kubernetes ≥1.23) Target average utilization of Memory on Pods        | `60`            |
+| `autoscaling.behavior`      | (Kubernetes ≥1.23) Configurable scaling behavior                                           | `{}`            |
 | `priorityClassName      `   | priorityClassName                                                                          | `""`            |
 | `storage`                   | Storage system to use                                                                      | `filesystem`    |
 | `tlsSecretName`             | Name of secret for TLS certs                                                               | `nil`           |

templates/hpa.yaml

@@ -0,0 +1,42 @@
+{{- if .Values.autoscaling.enabled }}
+{{- $apiVersions := .Capabilities.APIVersions -}}
+{{- if $apiVersions.Has "autoscaling/v2" }}
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ template "docker-registry.fullname" . }}
+  labels:
+    app: {{ template "docker-registry.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ template "docker-registry.fullname" . }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  metrics:
+{{- with .Values.autoscaling.targetCPUUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: cpu
+        target:
+          type: Utilization
+          averageUtilization: {{ . }}
+{{- end }}
+{{- with .Values.autoscaling.targetMemoryUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: memory
+        target:
+          type: Utilization
+          averageUtilization: {{ . }}
+{{- end }}
+{{- with .Values.autoscaling.behavior }}
+  behavior:
+    {{- toYaml . | nindent 4 }}
+{{- end }}
+{{- end }}
+{{- end }}

templates/hpaV1.yaml

@@ -0,0 +1,22 @@
+{{- if .Values.autoscaling.enabled }}
+{{- $apiVersions := .Capabilities.APIVersions -}}
+{{- if not ($apiVersions.Has "autoscaling/v2") }}
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ template "docker-registry.fullname" . }}
+  labels:
+    app: {{ template "docker-registry.name" . }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ template "docker-registry.fullname" . }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  targetCPUUtilizationPercentage: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
+{{- end }}
+{{- end }}

values.yaml

@@ -163,6 +163,30 @@ podDisruptionBudget: {}
   # maxUnavailable: 1
   # minAvailable: 2
 
+autoscaling:
+  enabled: false
+  minReplicas: 1
+  maxReplicas: 2
+  targetCPUUtilizationPercentage: 60
+  targetMemoryUtilizationPercentage: 60 # available only on Kubernetes ≥1.23 [required "autoscaling/v2"]
+  behavior: {} # available only on Kubernetes ≥1.23 [required "autoscaling/v2"]
+#   scaleDown:
+#     stabilizationWindowSeconds: 300
+#     policies:
+#     - type: Percent
+#       value: 100
+#       periodSeconds: 15
+#   scaleUp:
+#     stabilizationWindowSeconds: 0
+#     policies:
+#     - type: Percent
+#       value: 100
+#       periodSeconds: 15
+#     - type: Pods
+#       value: 4
+#       periodSeconds: 15
+#     selectPolicy: Max
+
 nodeSelector: {}
 
 affinity: {}