add guestbook-demo example

examples/guestbook-demo/README.md

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+
+# Guestbook demo
+
+This is a demo application to show 3-tier web application.
+
+
+You can find more at https://github.com/kadel/guestbook-demo

examples/guestbook-demo/backend.yml

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+name: backend
+containers:
+  #- image: quay.io/tomkral/guestbook-demo-backend:v1
+  - image: quay.io/tomkral/guestbook-demo-backend@sha256:abc9d419c2fc27511332471e7b82359f84ccec37577e1fcf05e7318145b3e125
+    env:
+      - name: MONGODB_PASSWORD
+        valueFrom:
+          secretKeyRef:
+            name: mongodb-user
+            key: MONGODB_PASSWORD
+      - name: MONGODB_USERNAME
+        valueFrom:
+          configMapKeyRef:
+            name: mongodb-user
+            key: MONGODB_USERNAME
+      - name: MONGODB_DATABASE
+        valueFrom:
+          configMapKeyRef:
+            name: mongodb-user
+            key: MONGODB_DATABASE
+      - name: MONGODB_SERVER
+        valueFrom:
+          configMapKeyRef:
+            name: mongodb-user
+            key: MONGODB_SERVER
+services:
+  - ports:
+    - port: 3000

examples/guestbook-demo/db.yml

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+# this should be idealy replaced by reference to Helm Chart
+
+name: mongodb
+containers:
+  #- image: bitnami/mongodb:3.4.7-r0
+  - image: bitnami/mongodb@sha256:0665d6f4be13b965a8ff60a11b770e6434b627ffc12df640e3c0527af53d449b
+    envFrom:
+      - secretRef:
+          name: mongodb-admin
+      - secretRef:
+          name: mongodb-user
+      - configMapRef:
+          name: mongodb-user
+    volumeMounts:
+     - name: mongodb-data
+       mountPath: /bitnami
+services:
+  - ports:
+    - port: 27017
+volumeClaims:
+  - name: mongodb-data
+    size: 100Mi
+secrets:
+  - name: mongodb-admin
+    stringData:
+      MONGODB_ADMIN_PASSWORD: rootpassword
+  - name: mongodb-user
+    stringData:
+      MONGODB_PASSWORD: pass
+configMaps:
+  - name: mongodb-user
+    data:
+      MONGODB_USERNAME: user
+      MONGODB_DATABASE: db
+      MONGODB_SERVER: mongodb:27017

examples/guestbook-demo/frontend.yml

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+name: frontend
+containers:
+  #- image: quay.io/tomkral/guestbook-demo-frontend:v1
+  - image: quay.io/tomkral/guestbook-demo-frontend@sha256:61154774892875ee2e6f4de87f08f5fcc7d736c1f9da02b9b33a583015206d1d
+services:
+  - type: LoadBalancer
+    ports:
+    - port: 8080