Canary with Flagger

packs/go/charts/templates/canary.yaml

@@ -0,0 +1,58 @@
+{{- if .Values.canary.enabled }}
+apiVersion: flagger.app/v1alpha3
+kind: Canary
+metadata:
+  name: {{ template "fullname" . }}
+  labels:
+    draft: {{ default "draft-app" .Values.draft }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
+spec:
+  provider: istio
+  targetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ template "fullname" . }}
+  progressDeadlineSeconds: {{ .Values.canary.progressDeadlineSeconds }}
+  {{- if .Values.hpa.enabled }}
+  autoscalerRef:
+    apiVersion: autoscaling/v2beta1
+    kind: HorizontalPodAutoscaler
+    name: {{ template "fullname" . }}
+  {{- end }}
+  service:
+    port: {{ .Values.service.externalPort }}
+    targetPort: {{ .Values.service.internalPort }}
+    gateways:
+    - {{ template "fullname" . }}
+    hosts:
+    - {{ .Values.canary.host }}
+  canaryAnalysis:
+    interval: {{ .Values.canary.canaryAnalysis.interval }}
+    threshold: {{ .Values.canary.canaryAnalysis.threshold }}
+    maxWeight: {{ .Values.canary.canaryAnalysis.maxWeight }}
+    stepWeight: {{ .Values.canary.canaryAnalysis.stepWeight }}
+    metrics:
+    - name: request-success-rate
+      threshold: {{ .Values.canary.canaryAnalysis.metrics.requestSuccessRate.threshold }}
+      interval: {{ .Values.canary.canaryAnalysis.metrics.requestSuccessRate.interval }}
+    - name: request-duration
+      threshold: {{ .Values.canary.canaryAnalysis.metrics.requestDuration.threshold }}
+      interval: {{ .Values.canary.canaryAnalysis.metrics.requestDuration.interval }}
+
+---
+
+apiVersion: networking.istio.io/v1alpha3
+kind: Gateway
+metadata:
+  name: {{ template "fullname" . }}
+spec:
+  selector:
+    istio: ingressgateway
+  servers:
+  - port:
+      number: {{ .Values.service.externalPort }}
+      name: http
+      protocol: HTTP
+    hosts:
+    - {{ .Values.canary.host }}
+{{- end }}

packs/go/charts/templates/deployment.yaml

@@ -8,7 +8,10 @@ metadata:
     draft: {{ default "draft-app" .Values.draft }}
     chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
 spec:
+{{- if .Values.hpa.enabled }}
+{{- else }}
   replicas: {{ .Values.replicaCount }}
+{{- end }}
   template:
     metadata:
       labels:

packs/go/charts/templates/hpa.yaml

@@ -0,0 +1,25 @@
+{{- if .Values.hpa.enabled }}
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ template "fullname" . }}
+  labels:
+    draft: {{ default "draft-app" .Values.draft }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ template "fullname" . }}
+  minReplicas: {{ .Values.hpa.minReplicas }}
+  maxReplicas: {{ .Values.hpa.maxReplicas }}
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      targetAverageUtilization: {{ .Values.hpa.cpuTargetAverageUtilization }}
+  - type: Resource
+    resource:
+      name: memory
+      targetAverageUtilization: {{ .Values.hpa.memoryTargetAverageUtilization }}
+{{- end }}

packs/go/charts/templates/service.yaml

@@ -1,4 +1,4 @@
-{{- if .Values.knativeDeploy }}
+{{- if or .Values.knativeDeploy .Values.canary.enabled }}
 {{- else }}
 apiVersion: v1
 kind: Service

packs/go/charts/values.yaml

@@ -13,6 +13,36 @@ env:
 # enable this flag to use knative serve to deploy the app
 knativeDeploy: false
 
+# HorizontalPodAutoscaler
+hpa:
+  enabled: false
+  minReplicas: 2
+  maxReplicas: 6
+  cpuTargetAverageUtilization: 80
+  memoryTargetAverageUtilization: 80
+
+# Canary deployments
+# If enabled, Istio and Flagger need to be installed in the cluster
+canary:
+  enabled: false
+  progressDeadlineSeconds: 60
+  canaryAnalysis:
+    interval: "1m"
+    threshold: 5
+    maxWeight: 60
+    stepWeight: 20
+    # WARNING: Canary deployments will fail and rollback if there is no traffic that will generate the below specified metrics.
+    metrics:
+      requestSuccessRate:
+        threshold: 99
+        interval: "1m"
+      requestDuration:
+        threshold: 1000
+        interval: "1m"
+  # The host is using Istio Gateway and is currently not auto-generated
+  # Please overwrite the `canary.host` in `values.yaml` in each environment repository (e.g., staging, production)
+  host: acme.com
+
 service:
   name: REPLACE_ME_APP_NAME
   type: ClusterIP