[stage-3] add helm chart for simple application

k8s/helm/simple-app/.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/

k8s/helm/simple-app/Chart.yaml

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+apiVersion: v2
+name: simple-app
+description: application helm chart
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "latest"

k8s/helm/simple-app/templates/NOTES.txt

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+---------------------------------------------------------
+
+Content of NOTES.txt appears after deploy.
+Deployed version {{ .Chart.AppVersion }}.
+
+---------------------------------------------------------

k8s/helm/simple-app/templates/deployment.yaml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: application
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-application
+spec:
+  replicas: {{ .Values.application.replicasCount }}
+  selector:
+    matchLabels:
+      app: {{ .Chart.Name }}-{{ .Values.environment }}
+      service: application
+  template:
+    metadata:
+      labels:
+        app: {{ .Chart.Name }}-{{ .Values.environment }}
+        service: application
+    spec:
+      containers:
+        - image: {{ .Values.image.name }}:{{ .Chart.AppVersion }}
+          imagePullPolicy: Always
+          name: application
+          ports:
+            - name: web
+              containerPort: 80
+          resources:
+            {{- toYaml .Values.application.resources | nindent 12 }}
+      terminationGracePeriodSeconds: 30

k8s/helm/simple-app/templates/ingress.yaml

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+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-application-ingress
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    ingress.kubernetes.io/rewrite-target: /
+spec:
+  rules:
+    - host: app-gw.my.to
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: {{ .Chart.Name }}-{{ .Values.environment }}-application
+                port:
+                  number: 80

k8s/helm/simple-app/templates/service.yaml

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+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}-{{ .Values.environment }}-application
+spec:
+  ports:
+    - name: web
+      port: 80
+  selector:
+    app: {{ .Chart.Name }}-{{ .Values.environment }}
+    service: application

k8s/helm/simple-app/values.yaml

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+environment: production
+
+image:
+  name: dannecron/parcel-example-neko
+
+application:
+  replicasCount: 1
+  resources:
+    limits:
+      cpu: 200m
+      memory: 256Mi
+    requests:
+      cpu: 100m
+      memory: 128Mi