readme with commands

Author: FunkeMT

inventory-app-istio/kustomization.yaml

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+# Presentation Commands
+
+## Architecture
+> Describe the architecture of the application. Describe the artifacts you created to build the docker images and to deploy the application to Kubernetes.
+
+* Docker architecture
+
+* Kubernetes architecture
+
+* Application
+
+* Show nginx CORS config  
+`inventory-api/inventory-api-ingress.yaml`
+
+* TLS  
+    * Show Certificate in Browser
+    * Show Secret in Kubernetes  
+    `kubectl  get secrets`  
+    `kubectl describe secret inventory-app-tls-secret`
+
+## Configuration
+> Show how you configured the pre-requisites for the application (Load Balancer, Service Mesh, Storage Class, Registry etc).
+
+* Show microk8s nodes  
+    * `kubectl get nodes`
+    * `kubectl describe node mtfunke-vu-ubuntu`  
+    (point to IP adress and CPU)
+
+* Show microk8s status  
+`microk8s status`  
+(point to plugins like MetalLB and HELM3 and ISTIO)
+
+* Show MetalLB Load Balancer  
+`kubectl -n metallb-system describe configmap config`
+
+* Show default StorageClass  
+`kubectl get sc`
+
+* Show registry  
+`microk8s ctr images ls |grep localhost`
+
+## Deployment HELM
+> Show how you build the container images and publish to a registry. Show how you deploy the application. Show how to scale the application horizontally (stateless parts only). Show how to uninstall the application.
+
+* Build and tag Docker container images API
+    * `docker build -t inventory-api:v10 inventory-app/inventory-api/api-server/`
+    * `docker tag inventory-api:v10 localhost:32000/inventory-api:v10`
+    * `docker push localhost:32000/inventory-api:v10`
+
+* Build and tag Docker container images UI
+    * `docker build -t inventory-ui:v10 inventory-app/inventory-ui/ui-client/`
+    * `docker tag inventory-ui:v10 localhost:32000/inventory-ui:v10`
+    * `docker push localhost:32000/inventory-ui:v10`
+
+* Crate namespace  
+`kubectl create namespace inventory-app-helm`
+
+* Install HELM chart  
+`helm install inventory-app-helm inventory-app/helm/inventory-app-chart/ -n inventory-app-helm`
+
+* Scale horizontally  
+`kubectl -n inventory-app-helm scale deployment/inventory-api-deployment --replicas=5`
+
+* Uninstall HELM chart  
+`helm uninstall inventory-app-helm -n inventory-app-helm`
+
+
+## Upgrade
+> Show how you re-build the application after a source code change. Show how you upgrade the running application in two ways: deployment rollout and canary update.
+
+* Implement API change  
+    * `app.py`
+    * `..v3 DEMO CHANGE`
+
+* Build Docker Image  
+    * `docker build -t inventory-api:v7 inventory-app/inventory-api/api-server/`
+
+* Tag and push Image for Localhost  
+    * `docker tag inventory-api:v7-helm localhost:32000/inventory-api:v7-helm`
+    * `docker push localhost:32000/inventory-ui:v7-helm`
+
+* Change HELM chart appVersion
+    * `helm/inventory-app-chart/charts/inventoryAPI/Chart.yaml`
+
+* Upgrade HELM
+    * `helm upgrade inventory-app-helm inventory-app/helm/inventory-app-chart/ -n inventory-app-helm`
+
+* Watch rollout
+    * `kubectl -n inventory-app-helm get pods -w`
+
+* Canary update
+    * Run two versions in paralell
+    * apply (manually) deployment for canary update  
+    `kubectl -n inventory-app-helm apply -f inventory-api-canary.yaml`
+    * Show labels  
+    `kubectl -n inventory-app-helm get pods --show-labels -w`
+
+## GCloud
+* See video recording for commands and further explanations.
+
+## Istio
+* see `../inventory-app-istio/README.md`

inventory-app-istio/prometheus-np-service.yaml

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+# Source: inventory-app-chart/charts/inventoryAPI/templates/deployment.yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: inventory-api-canary
+  labels:
+    app: inventory-app
+    group: backend
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: inventory-api
+      version: v5
+  template:
+    metadata:
+      labels:
+        app: inventory-api
+        group: backend
+        version: v5
+    spec:
+      containers:
+        - name: inventory-api-container
+          image: "localhost:32000/inventory-api:v5"
+          ports:
+            - containerPort: 5000
+          envFrom:
+            - configMapRef:
+                name: postgres-config
+          env:
+            - name: POSTGRES_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: postgres-secret
+                  key: POSTGRES_PASSWORD