add 3

3.zalando/exampleApp.yaml

@@ -0,0 +1,85 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: test-app
+  namespace: rm-pgsql
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: test-app
+  template:
+    metadata:
+      labels:
+        app: test-app
+    spec:
+      containers:
+      - name: test-app
+        image: node:18
+        command: ["/bin/sh", "-c"]
+        args:
+        - |
+          mkdir -p /tmp/app && \
+          cp /app/test_app.js /app/package.json /tmp/app/ && \
+          cd /tmp/app && \
+          npm install && \
+          node test_app.js
+        env:
+        - name: DB_HOST
+          value: rm-psql-pooler-repl
+        - name: DB_USER
+          valueFrom:
+            secretKeyRef:
+              name: rmu.rm-psql
+              key: username
+        - name: DB_PASSWORD
+          value: "123"
+        - name: DB_NAME
+          value: rm
+        volumeMounts:
+        - name: app-code
+          mountPath: /app
+      volumes:
+      - name: app-code
+        configMap:
+          name: test-app-configmap
+          items:
+          - key: test_app.js
+            path: test_app.js
+          - key: package.json
+            path: package.json
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: test-app-configmap
+  namespace: rm-pgsql
+data:
+  test_app.js: |
+    const { Client } = require('pg');
+
+        const client = new Client({
+          host: process.env.DB_HOST,
+          user: process.env.DB_USER,
+          password: process.env.DB_PASSWORD,
+          database: process.env.DB_NAME
+        });
+
+        client.connect()
+          .then(() => {
+            console.log(`Successfully connected to the database ${process.env.DB_NAME} on ${process.env.DB_HOST}`);
+            return client.end();
+          })
+          .catch((err) => {
+            console.error(`Error: ${err}`);
+          });
+  package.json: |
+      {
+        "name": "test-app",
+        "version": "1.0.0",
+        "main": "test_app.js",
+        "dependencies": {
+          "pg": "^8.7.1"
+        }
+      }
+---