Merge pull request #38 from WyriHaximusNet/default-backend-add-hpa

[default-backend] Add HPA
WyriHaximusNet · Oct 18, 2020 · 2d2c115 · 2d2c115
2 parents 4c55203 + da73d22
commit 2d2c115
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Showing 5 changed files with 35 additions and 2 deletions.
diff --git a/charts/default-backend/Chart.yaml b/charts/default-backend/Chart.yaml
@@ -4,7 +4,7 @@ description: A Helm chart for Kubernetes
 home: https://github.com/wyrihaximusnet/docker-default-backend
 icon: https://helm.wyrihaximus.net/images/charts/default-backend.png
 type: application
-version: 0.2.0
+version: 0.3.0
 appVersion: random
 maintainers:
   - name: WyriHaximus

diff --git a/charts/default-backend/README.md b/charts/default-backend/README.md
@@ -18,14 +18,17 @@ This chart has very little configuration, it runs without any. But it is recomme
 configuration. Both [`k8s.wyrihaximus.net`](https://k8s.wyrihaximus.net/) and 
 [`default-backend.k8s.wyrihaximus.net`](https://default-backend.k8s.wyrihaximus.net/) are active, refresh the pages a 
 few times. This configuration example also enables the cronjob that replaces the oldest pod, and forces the latest, 
-hourly retagged, Docker image to be used.
+hourly retagged, Docker image to be used. It also has the horizontal pod autoscaler enabled.
 
 ```yaml
 replicas: 3
 
 cron:
   replaceOldestPodHourly: true
 
+hpa:
+  enable: true
+
 ingress:
   hosts:
     - k8s.wyrihaximus.net

diff --git a/charts/default-backend/ci/single-replica-values.yaml b/charts/default-backend/ci/single-replica-values.yaml
@@ -1 +1,7 @@
 replicas: 1
+
+cron:
+  replaceOldestPodHourly: true
+
+hpa:
+  enable: true
diff --git a/charts/default-backend/templates/hpa.yaml b/charts/default-backend/templates/hpa.yaml
@@ -0,0 +1,20 @@
+{{- if .Values.hpa.enable -}}
+apiVersion: autoscaling/v2beta2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ template "default-backend.fullname" . }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ template "default-backend.fullname" . }}
+  minReplicas: {{ .Values.replicas }}
+  maxReplicas: {{ .Values.hpa.maxReplicas }}
+  metrics:
+    - type: Resource
+      resource:
+        name: cpu
+        target:
+          type: Utilization
+          averageUtilization: 80
+{{ end }}
diff --git a/charts/default-backend/values.yaml b/charts/default-backend/values.yaml
@@ -14,6 +14,10 @@ replicas: 2
 cron:
   replaceOldestPodHourly: false
 
+hpa:
+  enable: false
+  maxReplicas: 1024
+
 resources:
   limits:
     cpu: 75m