Software Containerization - Group 32

Description

This project is a simple web application built using Flask, React, and PostgreSQL. It allows users to retrieve product information and perform basic operations like adding and deleting products from the database.

App Functions：

1. Retrieve product information from the database
2. Add new products to the database
3. Delete existing products from the database

The following explains the usage of each directory:

• backend:including the source code to create the api server
• frontend: including the source code to create the frontend page
• kubernetes: including the manifests used to deploy postgres, flask and web on GKE
• rest-api-chart: including the herm charts

Commands shown in the Presentation

Our project is shown on GKE

• First, building Docker Images and publishing to a registry:

  cd backend (from root directory)

  Show the dockerfile

  cat Dockerfile

  docker build -t mjajod2/flask:v10 .

  docker push mjajod2/flask:v10

  Then, we build and push the web frontend images to registry:

  cd frontend (from root directory)

  docker build -t mjajod2/web-frontend:vs2

  docker push mjajod2/web-frontend:vs2

• Deploying the application on GKE

  Setting Postgres config:

  kubectl apply -f ./kubernetes/postgres/postgres-config.yaml

  Creating the database credentials:

  kubectl apply -f ./kubernetes/postgres/postgres-secret.yaml

  Creating the volume:

  kubectl apply -f ./kubernetes/postgres/postgres-storage.yaml

  Creating the deployment, service and network policy for the postgres:

  kubectl apply -f ./kubernetes/postgres/postgres-deployment.yaml

  kubectl apply -f ./kubernetes/postgres/postgres-service.yaml

  Check the pods now:

  kubectl get pods

  Creating the Flask deployment and service:

  kubectl apply -f ./kubernetes/flask/api-deployment.yaml kubectl apply -f ./kubernetes/flask/api-service.yaml

  Check the pods now:

  kubectl get pods

  Creating web-frontend deployment and service:

  kubectl apply -f ./kubernetes/web/web-deployment.yaml

  kubectl apply -f ./kubernetes/web/web-ingress.yaml

  kubectl apply -f ./kubernetes/web/web-service.yaml

  Check the pods now:

  kubectl get pods

• Scaling the stateless application:

  kubectl scale --replicas=3 deployment web-frontend-deployment: Scales the web-frontend from 1 to 3 replicas.

  kubectl get pods: To check the scaling results

• Pre-requisites configuration:

  kubectl get storageclass: Shows the storage class (Can also be seen using kubectl get pv).

• Deployment Rollout:

  For deployment rollout:

  kubectl edit deployment/web-frontend-deployment:

  Update terminationGracePeriodSeconds to 60.

  The output is similar to deployment.apps/web-frontend edited.

  To see the rollout status:

  kubectl rollout status deployment/web-frontend-deployment

  The deployment rollout can be checked by seeing the new pods created using: kubectl get pods

  cd canary

  Delete the web deployment kubectl delete deployment web-frontend-deployment

  kubectl apply -f web-d1.yaml

  kubectl get pods --show-labels

  kubectl apply -f web-d2.yaml

  kubectl scale --replicas=9 deploy web-frontend-deployment

  kubectl get pods --show-labels

  kubectl scale --replicas=9 deploy web-frontend-deployment-2

  kubectl delete deploy web-frontend-deployment

  kubectl get pods --show-labels

• cd roles/pod-role-config

  kubectl apply -f .

  kubectl get roles: Shows the roles.

  This role can reach pods: kubectl get pods --as=system:serviceaccount:default:serviceaccount-1

  This role cannot reach secretskubectl get secrets --as=system:serviceaccount:default:serviceaccount-1

• Show network policy:

  kubectl get networkpolicies

• Install, Upgrade and Uninstall the application using Helm

  cd helm Show the Charts and cd../../../../

  Packages the helm charthelm package web-frontend-chart

  Installs the application.helm install demo ./web-frontend-chart-1.0.0.tgz

  Upgrade the version:

  Change the version number to 2.0.0 : sudo nano web-frontend-chart/Chart.yaml

  Packages the helm chart again:helm package web-frontend-chart

  To show the current chart version: helm ls

  Upgrades the application to 2.0.0: helm upgrade demo ./web-frontend-chart-2.0.0.tgz

  To show the upgraded 2.0.0 version: helm ls

  To uninstall the application: helm uninstall demo

  To show the application has been uninstalled: helm ls