Playground / Helm chart builder

Helm chart builder

Set an image, a service, and a few optional extras, and get a working single-Deployment chart -- Chart.yaml, values.yaml, and templates for a Deployment, Service, Ingress, and HorizontalPodAutoscaler. See Helm for what each piece is doing.

Chart

Chart nameDescriptionImage repositoryImage tagContainer port

Service

TypeService portReplicasEnvironment variables (one KEY=value per line)

Resources

Set CPU/memory requests and limits

CPU requestMemory requestCPU limitMemory limit

Ingress

Expose with an Ingress

Autoscaling

Scale replicas with a HorizontalPodAutoscaler

Chart.yaml

apiVersion: v2
name: my-app
description: A Helm chart for my-app
type: application
version: 0.1.0
appVersion: "1.0.0"

values.yaml

replicaCount: 2

image:
  repository: docktionary/app
  tag: "1.0.0"
  pullPolicy: IfNotPresent

service:
  type: ClusterIP
  port: 80
  targetPort: 3000

env:
  []

resources:
  requests:
    cpu: 100m
    memory: 128Mi
  limits:
    cpu: 500m
    memory: 256Mi

ingress:
  enabled: false
  className: nginx
  host: chart-example.local
  tls: false

autoscaling:
  enabled: false
  minReplicas: 2
  maxReplicas: 5
  targetCPUUtilizationPercentage: 80

templates/deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: {{ .Release.Name }}-{{ .Chart.Name }}
  labels:
    app.kubernetes.io/name: {{ .Chart.Name }}
    app.kubernetes.io/instance: {{ .Release.Name }}
spec:
  {{- if not .Values.autoscaling.enabled }}
  replicas: {{ .Values.replicaCount }}
  {{- end }}
  selector:
    matchLabels:
      app.kubernetes.io/name: {{ .Chart.Name }}
      app.kubernetes.io/instance: {{ .Release.Name }}
  template:
    metadata:
      labels:
        app.kubernetes.io/name: {{ .Chart.Name }}
        app.kubernetes.io/instance: {{ .Release.Name }}
    spec:
      containers:
        - name: {{ .Chart.Name }}
          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
          imagePullPolicy: {{ .Values.image.pullPolicy }}
          ports:
            - containerPort: {{ .Values.service.targetPort }}
          {{- if .Values.env }}
          env:
            {{- range .Values.env }}
            - name: {{ .name }}
              value: {{ .value | quote }}
            {{- end }}
          {{- end }}
          {{- if .Values.resources }}
          resources:
            {{- toYaml .Values.resources | nindent 12 }}
          {{- end }}

templates/service.yaml

apiVersion: v1
kind: Service
metadata:
  name: {{ .Release.Name }}-{{ .Chart.Name }}
  labels:
    app.kubernetes.io/name: {{ .Chart.Name }}
    app.kubernetes.io/instance: {{ .Release.Name }}
spec:
  type: {{ .Values.service.type }}
  ports:
    - port: {{ .Values.service.port }}
      targetPort: {{ .Values.service.targetPort }}
      protocol: TCP
  selector:
    app.kubernetes.io/name: {{ .Chart.Name }}
    app.kubernetes.io/instance: {{ .Release.Name }}

templates/ingress.yaml

{{- if .Values.ingress.enabled }}
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: {{ .Release.Name }}-{{ .Chart.Name }}
  {{- if .Values.ingress.tls }}
  annotations:
    nginx.ingress.kubernetes.io/ssl-redirect: "true"
  {{- end }}
spec:
  ingressClassName: {{ .Values.ingress.className }}
  {{- if .Values.ingress.tls }}
  tls:
    - hosts:
        - {{ .Values.ingress.host }}
      secretName: {{ .Release.Name }}-{{ .Chart.Name }}-tls
  {{- end }}
  rules:
    - host: {{ .Values.ingress.host }}
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: {{ .Release.Name }}-{{ .Chart.Name }}
                port:
                  number: {{ .Values.service.port }}
{{- end }}

templates/hpa.yaml

{{- if .Values.autoscaling.enabled }}
apiVersion: autoscaling/v2
kind: HorizontalPodAutoscaler
metadata:
  name: {{ .Release.Name }}-{{ .Chart.Name }}
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: {{ .Release.Name }}-{{ .Chart.Name }}
  minReplicas: {{ .Values.autoscaling.minReplicas }}
  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
  metrics:
    - type: Resource
      resource:
        name: cpu
        target:
          type: Utilization
          averageUtilization: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
{{- end }}