Solution

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

@@ -0,0 +1,8 @@
+apiVersion: v2
+name: todoapp
+description: A Helm chart for Kubernetes
+type: application
+version: 0.1.1
+appVersion: "1.16.0"
+dependencies:
+- name: 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

@@ -0,0 +1,6 @@
+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

@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: mysql
+  namespace: {{ .Values.mysql.namespace }}
+  labels:
+    app: mysql
+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

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: {{ .Values.mysql.namespace }}

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

@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: mysql-secrets
+  namespace: {{ .Values.mysql.namespace }}
+type: Opaque
+data:
+  {{- range $key, $value := .Values.mysql.secrets }}
+  {{ $key }}: {{ $value }}
+  {{- end }}

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

@@ -0,0 +1,17 @@
+# Headless service for stable DNS entries of StatefulSet members.
+apiVersion: v1
+kind: Service
+metadata:
+  name: mysql
+  namespace: {{ .Values.mysql.namespace }}
+spec:
+  selector:
+    app: mysql
+  ports:
+  - name: mysql
+    port: 3306
+  clusterIP: None
+
+# pod-name.service-name.namespace.svc.cluster.local
+# pod-name.service-name
+# mysql-0.mysql.mysql.svc.cluster.local

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

@@ -0,0 +1,97 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: mysql
+  namespace: {{ .Values.mysql.namespace }}
+spec:
+  selector:
+    matchLabels:
+      app: mysql
+  replicas: {{ .Values.mysql.dbReplicas }}
+  serviceName: mysql
+  template:
+    metadata:
+      labels:
+        app: mysql
+    spec:
+      containers:
+      - name: mysql
+        image: {{ .Values.mysql.image.repo }}:{{ .Values.mysql.image.tag }}
+        env:
+        - name: MYSQL_ROOT_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: mysql-secrets
+              key: MYSQL_ROOT_PASSWORD
+        - name: MYSQL_USER
+          valueFrom:
+            secretKeyRef:
+              name: mysql-secrets
+              key: MYSQL_USER
+        - name: MYSQL_PASSWORD
+          valueFrom:
+            secretKeyRef:
+              name: mysql-secrets
+              key: MYSQL_PASSWORD
+        - name: MYSQL_DATABASE
+          value: app_db
+        ports:
+        - name: mysql
+          containerPort: 3306
+        volumeMounts:
+        - name: data
+          mountPath: /var/lib/mysql
+          subPath: mysql
+        - name: config-map
+          mountPath: /docker-entrypoint-initdb.d
+        resources:
+          requests:
+            cpu: {{ .Values.mysql.resources.requests.cpu }}
+            memory: {{ .Values.mysql.resources.requests.memory }}
+        livenessProbe:
+          exec:
+            command: ["mysqladmin", "ping"]
+          initialDelaySeconds: 30
+          periodSeconds: 10
+          timeoutSeconds: 5
+        readinessProbe:
+          exec:
+            command: ["mysqladmin", "ping"]
+          initialDelaySeconds: 5
+          periodSeconds: 2
+          timeoutSeconds: 1
+      volumes:
+      - name: config-map
+        configMap:
+          name: mysql
+      tolerations:
+      - key: {{ .Values.mysql.tolerations.key }}
+        operator: "Equal"
+        value: {{ .Values.mysql.tolerations.value }}
+        effect: "NoSchedule"
+      affinity:
+        podAntiAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            - labelSelector:
+                matchExpressions:
+                  - key: {{ .Values.mysql.affinity.podaffinity.key }}
+                    operator: In
+                    values:
+                    - {{ .Values.mysql.affinity.podaffinity.value }}
+              topologyKey: "kubernetes.io/hostname"
+        nodeAffinity:
+          requiredDuringSchedulingIgnoredDuringExecution:
+            nodeSelectorTerms:
+              - matchExpressions:
+                  - key: {{ .Values.mysql.affinity.nodeaffinity.key }}
+                    operator: In
+                    values:
+                    - {{ .Values.mysql.affinity.nodeaffinity.value }}
+  volumeClaimTemplates:
+  - metadata:
+      name: data
+    spec:
+      accessModes: ["ReadWriteOnce"]
+      resources:
+        requests:
+          storage: {{ .Values.mysql.VolumeClaim }}

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

@@ -0,0 +1,32 @@
+mysql:
+  namespace: mysql
+
+  image:
+    repo: mysql
+    tag: 8.0
+
+  dbReplicas: 2
+
+  resources:
+    requests:
+      cpu: 500m
+      memory: 1Gi
+
+  secrets:
+    MYSQL_ROOT_PASSWORD: "MTIzNA==" # Base64 encoding for "1234"
+    MYSQL_USER: "YXBwX3VzZXI=" # Base64 encoding for "app_user"
+    MYSQL_PASSWORD: "MTIzNA==" # Base64 encoding for "1234"
+
+  VolumeClaim: 2Gi
+
+  tolerations:
+    key: "app"
+    value: "mysql"
+
+  affinity:
+    podaffinity:
+      key: "app"
+      value: "mysql"
+    nodeaffinity:
+      key: "app"
+      value: "mysql"

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

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: todoapp-service
+  namespace: {{ .Values.todoapp.namespace }}
+spec:
+  type: ClusterIP
+  selector:
+    app: todoapp
+  ports:
+  - protocol: TCP
+    port: 80
+    targetPort: 8080

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

@@ -0,0 +1,7 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: app-config
+  namespace: {{ .Values.todoapp.namespace }}
+data:
+  PYTHONUNBUFFERED: "1"

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

@@ -0,0 +1,86 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: todoapp
+  namespace: {{ .Values.todoapp.namespace }}
+spec:
+  strategy:
+    type: RollingUpdate
+    rollingUpdate:
+      maxSurge: {{ .Values.todoapp.RollUpdParam.maxSurge }}
+      maxUnavailable: {{ .Values.todoapp.RollUpdParam.maxUnavailable }}
+  selector:
+    matchLabels:
+      app: todoapp
+  template:
+    metadata:
+      labels:
+        app: todoapp
+    spec:
+      serviceAccountName: {{ .Values.todoapp.RBACService.name }}
+      containers:
+      - name: todoapp
+        image: {{ .Values.todoapp.image.repo }}:{{ .Values.todoapp.image.tag }}
+        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:
+          requests:
+            memory: {{ .Values.todoapp.resources.requests.memory }}
+            cpu: {{ .Values.todoapp.resources.requests.cpu }}
+          limits:
+            memory: {{ .Values.todoapp.resources.limits.memory }}
+            cpu: {{ .Values.todoapp.resources.limits.cpu }}
+        env:
+        - name: PYTHONUNBUFFERED
+          valueFrom:
+            configMapKeyRef:
+              name: app-config
+              key: PYTHONUNBUFFERED
+        {{- range $key, $value := .Values.todoapp.secrets }}
+        - name: {{ $key }}
+          valueFrom:
+            secretKeyRef:
+              name: app-secret
+              key: {{ $key }}
+        {{- end }}
+        ports:
+        - containerPort: 8080
+        livenessProbe:
+          httpGet:
+            path: api/health
+            port: 8080
+          initialDelaySeconds: 5
+          periodSeconds: 5
+        readinessProbe:
+          httpGet:
+            path: api/ready
+            port: 8080
+          initialDelaySeconds: 30
+          periodSeconds: 15
+      volumes:
+      - name: data
+        persistentVolumeClaim:
+          claimName: pvc-data
+      - name: app-secrets-volume
+        secret:
+          secretName: app-secret
+      - name: app-config-volume
+        configMap:
+          name: app-config
+      affinity:
+        nodeAffinity:
+          preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: {{ .Values.todoapp.nodeAffinity.weight }}
+            preference:
+              matchExpressions:
+              - key: {{ .Values.todoapp.nodeAffinity.key }}
+                operator: {{ .Values.todoapp.nodeAffinity.operator }}
+                values:
+                - {{ .Values.todoapp.nodeAffinity.values }}

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

@@ -0,0 +1,25 @@
+apiVersion: autoscaling/v2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: todoapp
+  namespace: {{ .Values.todoapp.namespace }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: todoapp
+  minReplicas: {{ .Values.todoapp.HorScaling.minReplicas }}
+  maxReplicas: {{ .Values.todoapp.HorScaling.maxReplicas }}
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: {{ .Values.todoapp.HorScaling.resourcetarget.cpu }}
+  - type: Resource
+    resource:
+      name: memory
+      target:
+        type: Utilization
+        averageUtilization: {{ .Values.todoapp.HorScaling.resourcetarget.memory }}

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

@@ -0,0 +1,18 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: todoapp-ingress
+  namespace: {{ .Values.todoapp.namespace }}
+  annotations:
+    nginx.ingress.kubernetes.io/rewrite-target: /
+spec:
+  rules:
+  - http:
+      paths:
+      - pathType: Prefix
+        path: /
+        backend:
+          service:
+            name: todoapp-service
+            port:
+              number: 80