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Software Containerisation (Group 49)

Project space for Software Containerisation, VU Amsterdam.

The final URL exposing the web-frontend (with TLS): https://166.74.160.34.bc.googleusercontent.com/

The domain name was obtained by the following process: Reserve a static IP on GKE, reverseLookUp on the reserved IP which points to the above URL.

Description

The repository houses all the source files for running the web application using microk8s and Google Kubernetes Engine. The following explains the usage of each directory:

  • kubernetes: Includes the manifests used to deploy postgres, rest-api and web-frontend on microk8s and GKE.
  • helm: Includes the helm charts to run the application using helm (see helm/README.md to run the helm instructions).
  • rest-api: Includes the source files to create the REST-API server. (also available as a docker image: itsron143/rest-api:latest)
  • web-frontend: Includes the source file to create the frontend NGINX sercer. (also available as a docker image: itsron143/web-frontend:latest)

deploy.sh can be used to deploy the application from scratch using microk8s.

deploy_gke.sh can be used to deploy the application from scratch on GKE.

Commands (Shown in the presentation)

NOTE: The presentation is shown on GKE.

  • Building Docker Images and Publishing to a Registry: First, we build and push the rest-api images to the registry:

    cd rest-api (from root directory)

    sudo docker build -t itsron143/rest-api:latest .

    sudo docker push itsron143/rest-api:latest

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

    cd web-frontend (from root directory)

    sudo docker build -t itsron143/web-frontend:latest .

    sudo docker push itsron143/web-frontend:latest

  • Deploying the Application for the first time (on GKE):

    sudo ./deploy_gke.sh

  • Pre-requisites configuration: kubectl describe ingress managed-cert: Shows the load balancer used.

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

    kubectl describe managedcertificates managed-cert: Shows the certificate.

    kubectl get networkpolicies: Shows the network policies.

    kubectl get roles: Shows the roles.

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

  • Install, Upgrade and Uninstall the application using Helm: cd helm

    helm package humans-logger-chart: Packages the humans-logger-chart helm chart.

    helm install hl ./humans-logger-chart-1.0.0.tgz: Installs the application.

    helm ls: To show version 1.0.0 installed.

    nano humans-logger-chart/Chart.yaml: Change the version number to 2.0.0 here version: 1.0.0.

    helm upgrade hl ./humans-logger-chart-2.0.0.tgz: Upgrades the application to 2.0.0.

    helm ls: To show the upgraded 2.0.0 version.

    helm uninstall hl: To uninstall the application.

    helm ls: To show the application has been uninstalled.

  • Deployment Rollout: For deployment rollout:

    kubectl edit deployment/rest-api: Update terminationGracePeriodSeconds: 30 to 60.

    The output is similar to deployment.apps/rest-api edited.

    To see the rollout status:

    kubectl rollout status deployment/rest-api

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