Solution:1.0

.infrastructure/helm-chart/todoapp/.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/

.infrastructure/helm-chart/todoapp/Chart.yaml

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+apiVersion: v2
+name: todoapp
+description: A Helm chart for Kubernetes
+
+type: application
+
+version: 0.1.0
+
+appVersion: "1.16.0"
+
+dependencies:
+  - name: mysql 
+    version: 0.1.0
+    repository: "file://charts/mysql"

.infrastructure/helm-chart/todoapp/charts/mysql/.helmignore

@@ -0,0 +1,23 @@
+# 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/

.infrastructure/helm-chart/todoapp/charts/mysql/Chart.yaml

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+apiVersion: v2
+name: mysql
+description: A Helm chart for Kubernetes
+
+type: application
+
+version: 0.1.0
+
+appVersion: "1.16.0"

.infrastructure/helm-chart/todoapp/charts/mysql/templates/configMap.yml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ .Chart.Name }}-configmap
+  namespace: {{ .Values.global.namespace }}
+  labels:
+    app: {{ .Chart.Name }}
+data:
+  init.sql: |
+    GRANT ALL PRIVILEGES ON app_db.* TO 'app_user'@'%';
+    USE app_db;
+    CREATE TABLE counter (
+        id INT AUTO_INCREMENT PRIMARY KEY,
+        value INT
+    );

.infrastructure/helm-chart/todoapp/charts/mysql/templates/ns.yml

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+apiVersion: v1
+kind: Namespace
+metadata:
+  name: {{ .Values.global.namespace }}

.infrastructure/helm-chart/todoapp/charts/mysql/templates/secret.yml

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+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ .Chart.Name }}-secrets
+  namespace: {{ .Values.global.namespace }}
+type: Opaque
+data:
+{{- range $k, $v := .Values.mysql.secrets }}
+  {{ $k | upper }}: {{ $v | b64enc | quote }}
+{{- end }}

.infrastructure/helm-chart/todoapp/charts/mysql/templates/service.yml

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+# Headless service for stable DNS entries of StatefulSet members.
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}-clusterip
+  namespace: {{ .Values.global.namespace }}
+spec:
+  selector:
+    app: {{ .Chart.Name }}
+  ports:
+  - name: {{ .Values.mysql.service.ports.name }}
+    port: {{ .Values.mysql.service.ports.port }}
+  clusterIP: {{ .Values.mysql.service.clusterIP }}

.infrastructure/helm-chart/todoapp/charts/mysql/templates/statefulSet.yml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: {{ .Chart.Name }}-statefulset
+  namespace: {{ .Values.global.namespace }}
+spec:
+  selector:
+    matchLabels:
+      app: {{ .Chart.Name }}
+  replicas: {{ .Values.mysql.statefulSet.replicas }}
+  serviceName: {{ .Chart.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ .Chart.Name }}
+    spec:
+      containers:
+      - name: {{ .Values.mysql.statefulSet.name }}
+        image: {{ .Values.mysql.statefulSet.repository }}:{{ .Values.mysql.statefulSet.version }}
+        env:
+        {{- range $k := .Values.mysql.secrets }}
+        - name: {{ $k | upper }}
+          valueFrom:
+            secretKeyRef:
+              name: mysql-secrets
+              key: {{ $k | upper }}
+        {{- end }}
+        resources:
+          requests:
+            {{ .Values.mysql.statefulSet.resources.requests }}
+        ports:
+        - name: mysql
+          containerPort: 3306
+        volumeMounts:
+        - name: data
+          mountPath: /var/lib/mysql
+          subPath: mysql
+        - name: config-map
+          mountPath: /docker-entrypoint-initdb.d
+        livenessProbe:
+          {{ .Values.mysql.statefulSet.livenessProbe }}
+        readinessProbe:
+          {{ .Values.mysql.statefulSet.readinessProbe }}
+      volumes:
+      - name: config-map
+        configMap:
+          name: mysql
+      tolerations:
+      {{- range .Values.mysql.statefulSet.tolerations }}
+        - key: "{{ .key }}"
+          operator: "{{ .operator }}"
+          value: "{{ .value }}"
+          effect: "{{ .effect }}"
+      {{- end }}
+  volumeClaimTemplates:
+  - metadata:
+      name: data
+    spec:
+      accessModes: ["ReadWriteOnce"]
+      resources:
+        requests:
+          storage: {{ .Values.mysql.statefulSet.storage }}

.infrastructure/helm-chart/todoapp/charts/mysql/values.yaml

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+mysql:
+  service:
+    ports:
+      name: mysql
+      port: 3306
+    clusterIP: None
+
+  secrets:
+    MYSQL_ROOT_PASSWORD: "1234"
+    MYSQL_USER: "app_user"
+    MYSQL_PASSWORD: "1234"
+
+  statefulSet:
+    replicas: 2
+    name: mysql
+    repository: mysql
+    version: 8.0
+    storage: 2Gi
+
+    resources:
+      requests:
+        memory: 1Gi
+        cpu: 500m
+
+    livenessProbe:
+      exec:
+        command: ["mysqladmin", "ping"]
+      initialDelaySeconds: 30
+      periodSeconds: 10
+      timeoutSeconds: 5
+
+    readinessProbe:
+      exec:
+        command: ["mysqladmin", "ping"]
+      initialDelaySeconds: 5
+      periodSeconds: 2
+      timeoutSeconds: 1
+
+    affinity:
+      podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: "app"
+                    operator: In
+                    values:
+                    - mysql
+              topologyKey: "kubernetes.io/hostname"
+      nodeAffinity:
+        requiredDuringSchedulingIgnoredDuringExecution:
+          nodeSelectorTerms:
+            - matchExpressions:
+                - key: "app"
+                  operator: In
+                  values:
+                  - "mysql"
+
+    tolerations:
+    - key: "app"
+      operator: "Equal"
+      value: "mysql"
+      effect: "NoSchedule"

.infrastructure/helm-chart/todoapp/templates/clusterIp.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ .Chart.Name }}-service
+  namespace: {{ .Values.global.namespace }}
+spec:
+  type: ClusterIP
+  selector:
+    app: {{ .Chart.Name }}
+  ports:
+  - protocol: TCP
+    port: 80
+    targetPort: 8080

.infrastructure/helm-chart/todoapp/templates/configMap.yml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ .Chart.Name }}-config
+  namespace: {{ .Values.global.namespace }}
+data:
+  PYTHONUNBUFFERED: {{ .Values.todoapp.configs.PYTHONUNBUFFERED }}

.infrastructure/helm-chart/todoapp/templates/deployment.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ .Release.Name }}-{{ .Chart.Name }}
+  namespace: {{ .Values.global.namespace }}
+spec:
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: {{ .Values.todoapp.rollingUpdate.maxSurge }}
+      maxUnavailable: {{ .Values.todoapp.rollingUpdate.maxSurge }}
+  selector:
+    matchLabels:
+      app: {{ .Chart.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ .Chart.Name }}
+    spec:
+      serviceAccountName: {{ .Chart.Name }}-secrets-reader
+      containers:
+      - name: {{ .Values.todoapp.image.name }}
+        image: {{ .Values.todoapp.image.repository }}:{{ .Values.todoapp.image.version }}
+        volumeMounts:
+        - name: data
+          mountPath: /app/data
+        - name: app-secrets-volume
+          mountPath: "/app/secrets"
+          readOnly: true
+        - name: app-config-volume
+          mountPath: "/app/configs"
+          readOnly: true
+        resources:
+          {{ .Values.todoapp.resources }}
+        env:
+        - name: PYTHONUNBUFFERED
+          valueFrom:
+            configMapKeyRef:
+              name: {{ .Chart.Name }}-config
+              key: PYTHONUNBUFFERED
+        {{- range $k := .Values.todoapp.secrets }}
+        - name: {{ $k | upper }}
+          valueFrom:
+            secretKeyRef:
+              name: todoapp-secrets
+              key: {{ $k | upper }}
+        {{- end }}
+        ports:
+        - containerPort: 8080
+        livenessProbe:
+          httpGet:
+            path: api/health
+            port: 8080
+          initialDelaySeconds: 60
+          periodSeconds: 5
+        readinessProbe:
+          httpGet:
+            path: api/ready
+            port: 8080
+          initialDelaySeconds: 5
+          periodSeconds: 5
+      volumes:
+      - name: data
+        persistentVolumeClaim:
+          claimName: pvc-data
+      - name: app-secrets-volume
+        secret:
+          secretName: app-secret
+      - name: app-config-volume
+        configMap:
+          name: app-config
+      affinity:
+        {{ .Values.todoapp.affinity }}

.infrastructure/helm-chart/todoapp/templates/hpa.yml

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+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ .Chart.Name }}-hpa
+  namespace: {{ .Values.global.namespace }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ .Release.Name }}-{{ .Chart.Name }}
+  minReplicas: {{ .Values.todoapp.hpa.minReplicas }}
+  maxReplicas: {{ .Values.todoapp.hpa.maxReplicas }}
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: {{ .Values.todoapp.hpa.cpu.averageUtilization }}
+  - type: Resource
+    resource:
+      name: memory
+      target:
+        type: Utilization
+        averageUtilization: {{ .Values.todoapp.hpa.memory.averageUtilization }}

.infrastructure/helm-chart/todoapp/templates/ingress.yml

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+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ .Chart.Name }}-ingress
+  namespace: {{ .Values.global.namespace }}
+  annotations:
+    nginx.ingress.kubernetes.io/rewrite-target: /$2
+spec:
+  rules:
+  - http:
+      paths:
+      - pathType: Prefix
+        path: /(|$)(.*)
+        backend:
+          service:
+            name: {{ .Chart.Name }}-service
+            port:
+              number: 80