create flask app manifest for k8s deployment

Author: akhil27051999

k8s/application.yaml

@@ -0,0 +1,131 @@
+# ----------------------
+# Namespace for application
+# ----------------------
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: student-api
+---
+# ----------------------
+# ConfigMap for Flask API
+# ----------------------
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: flask-config
+  namespace: student-api
+data:
+  POSTGRES_HOST: "postgres"
+  POSTGRES_PORT: "5432"
+  POSTGRES_DB: "studentdb"
+---
+# ----------------------
+# Deployment for Flask REST API
+# ----------------------
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: flask-api
+  namespace: student-api
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: flask-api
+  template:
+    metadata:
+      labels:
+        app: flask-api
+    spec:
+      nodeSelector:
+        type: application
+      initContainers:
+        - name: db-migrations
+          image: akhilthyadi/flask-app:7.0.0
+          workingDir: /api/app
+          env:
+            - name: FLASK_APP
+              value: "wsgi.py"
+            - name: POSTGRES_USER
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-secret
+                  key: POSTGRES_USER
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-secret
+                  key: POSTGRES_PASSWORD
+            - 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: akhilthyadi/flask-app:7.0.0
+          ports:
+            - containerPort: 5000
+          env:
+            - name: POSTGRES_USER
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-secret
+                  key: POSTGRES_USER
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-secret
+                  key: POSTGRES_PASSWORD
+            - 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
+---
+# ----------------------
+# Service to expose Flask API
+# ----------------------
+apiVersion: v1
+kind: Service
+metadata:
+  name: flask-api-service
+  namespace: student-api
+spec:
+  selector:
+    app: flask-api
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 5000
+  type: NodePort