From 0a65be24245d0c3b4f514d794075972a2ac66581 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Kraus?= <bjoern.kraus@phoenix-media.eu>
Date: Tue, 20 Feb 2024 10:19:00 +0100
Subject: [PATCH] #14 implemented HPA for magento pods

---
 ci/kind-values.yaml |  2 ++
 templates/hpa.yaml  | 27 +++++++++++++++++++++++++++
 values.yaml         | 29 +++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 templates/hpa.yaml

diff --git a/ci/kind-values.yaml b/ci/kind-values.yaml
index 4cbff4a..d33ead0 100644
--- a/ci/kind-values.yaml
+++ b/ci/kind-values.yaml
@@ -2,6 +2,8 @@
 magento:
   podDisruptionBudget:
     enabled: true
+  horizontalPodAutoscaler:
+    enabled: true
 
 opensearch:
   extraEnvs:
diff --git a/templates/hpa.yaml b/templates/hpa.yaml
new file mode 100644
index 0000000..1dba1a5
--- /dev/null
+++ b/templates/hpa.yaml
@@ -0,0 +1,27 @@
+{{- if .Values.magento.horizontalPodAutoscaler.enabled }}
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ include "magento.name" . }}
+  labels:
+    {{- include "magento.labels" . | nindent 4 }}
+    {{- range $key, $val := ($.Values.magento.labels | default dict) }}
+    {{ $key }}: {{ $val | quote }}
+    {{- end }}
+spec:
+  scaleTargetRef:
+    kind: Deployment
+    name: {{ include "magento.name" . }}
+    apiVersion: apps/v1
+  {{- with .Values.magento.horizontalPodAutoscaler }}
+  minReplicas: {{ .minCount | default 1 }}
+  maxReplicas: {{ .maxCount | default 3 }}
+  behavior:
+    scaleUp:
+      {{- toYaml .scaleUp | nindent 6 }}
+    scaleDown:
+      {{- toYaml .scaleDown | nindent 6 }}
+  metrics:
+    {{- toYaml .metrics | nindent 4 }}
+  {{- end }}
+{{- end }}
diff --git a/values.yaml b/values.yaml
index 22292b6..e8214fa 100755
--- a/values.yaml
+++ b/values.yaml
@@ -61,11 +61,40 @@ magento:
       maxSurge: 100%
       maxUnavailable: 0
     type: RollingUpdate
+
   podDisruptionBudget:
     enabled: false
     minAvailable: 0
     maxUnavailable: 1
 
+  # HPA configuration, see https://kubernetes.io/docs/tasks/run-application/horizontal-pod-autoscale/#configurable-scaling-behavior
+  horizontalPodAutoscaler:
+    enabled: false
+    minCount: 1
+    maxCount: 3
+
+    scaleUp:
+      policies:
+        - type: Pods
+          value: 1
+          periodSeconds: 60
+      stabilizationWindowSeconds: 300
+
+    scaleDown:
+      policies:
+        - type: Pods
+          value: 1
+          periodSeconds: 60
+      stabilizationWindowSeconds: 300
+
+    metrics:
+      - type: Resource
+        resource:
+          name: cpu
+          target:
+            type: Utilization
+            averageUtilization: 80
+
   podSecurityContext: {}
   securityContext: {}
   tolerations: []