Added application helm files

Author: akhil27051999

helm/application/Chart.yaml

@@ -0,0 +1,6 @@
+apiVersion: v2
+name: application
+description: Helm chart for Flask REST API (student-api)
+type: application
+version: 0.1.0
+appVersion: "7.0.0"

helm/application/templates/configmap.yaml

@@ -0,0 +1,9 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: flask-config
+  namespace: {{ .Values.namespace }}
+data:
+  POSTGRES_HOST: {{ .Values.config.POSTGRES_HOST | quote }}
+  POSTGRES_PORT: {{ .Values.config.POSTGRES_PORT | quote }}
+  POSTGRES_DB: {{ .Values.config.POSTGRES_DB | quote }}

helm/application/templates/deployment.yaml

@@ -0,0 +1,91 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: flask-api
+  namespace: {{ .Values.namespace }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app: flask-api
+  template:
+    metadata:
+      labels:
+        app: flask-api
+    spec:
+      nodeSelector:
+{{ toYaml .Values.nodeSelector | indent 8 }}
+      initContainers:
+        - name: db-migrations
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          workingDir: /api/app
+          env:
+            - name: FLASK_APP
+              value: "wsgi.py"
+            - name: POSTGRES_USER
+              valueFrom:
+                secretKeyRef:
+                  name: {{ .Values.database.secretName }}
+                  key: {{ .Values.database.usernameKey }}
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: {{ .Values.database.secretName }}
+                  key: {{ .Values.database.passwordKey }}
+            - name: POSTGRES_HOST
+              valueFrom:
+                configMapKeyRef:
+                  name: flask-config
+                  key: POSTGRES_HOST
+            - name: POSTGRES_PORT
+              valueFrom:
+                configMapKeyRef:
+                  name: flask-config
+                  key: POSTGRES_PORT
+            - name: POSTGRES_DB
+              valueFrom:
+                configMapKeyRef:
+                  name: flask-config
+                  key: POSTGRES_DB
+          command:
+            - sh
+            - -c
+            - |
+              echo "Waiting for Postgres at $POSTGRES_HOST:$POSTGRES_PORT..."
+              until pg_isready -h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER; do
+                sleep 2
+              done
+              echo "Postgres is ready, running migrations..."
+              flask db upgrade
+      containers:
+        - name: flask-api
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          ports:
+            - containerPort: {{ .Values.service.targetPort }}
+          env:
+            - name: POSTGRES_USER
+              valueFrom:
+                secretKeyRef:
+                  name: {{ .Values.database.secretName }}
+                  key: {{ .Values.database.usernameKey }}
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: {{ .Values.database.secretName }}
+                  key: {{ .Values.database.passwordKey }}
+            - name: POSTGRES_HOST
+              valueFrom:
+                configMapKeyRef:
+                  name: flask-config
+                  key: POSTGRES_HOST
+            - name: POSTGRES_PORT
+              valueFrom:
+                configMapKeyRef:
+                  name: flask-config
+                  key: POSTGRES_PORT
+            - name: POSTGRES_DB
+              valueFrom:
+                configMapKeyRef:
+                  name: flask-config
+                  key: POSTGRES_DB

helm/application/templates/service.yaml

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

helm/application/values.yaml

@@ -0,0 +1,27 @@
+namespace: student-api
+
+replicaCount: 2
+
+image:
+  repository: akhilthyadi/flask-app
+  tag: "7.0.0"
+  pullPolicy: IfNotPresent
+
+service:
+  name: flask-api-service
+  type: NodePort
+  port: 80
+  targetPort: 5000
+
+config:
+  POSTGRES_HOST: "postgres"
+  POSTGRES_PORT: "5432"
+  POSTGRES_DB: "studentdb"
+
+database:
+  secretName: postgres-secret
+  usernameKey: POSTGRES_USER
+  passwordKey: POSTGRES_PASSWORD
+
+nodeSelector:
+  type: application