Software Containerization 2021

Implements the Dockerfiles and Kubernetes configuration for

• Backend API Server
  • Python Flask
• Frontend UI
  • nginx web-server
  • AngularJS
• Database
  • PostgreSQL

Architecture

Docker

Kubernetes

Repository structure

• inventory-app: Main application. Contains all necessary files and configurations for Docker and Kubernetes as shown in the presentation (except Istio).

  • inventory-api
    • api-server: Holds Flask app and the Dockerfile
    • *.yaml: Kubernetes configuration files (manual deployment)
  • inventory-db:
    • *.yaml: Kubernetes configuration files (manual deployment)
  • inventory-ui:
    • ui-client: Holds the AngularJS UI and the Dockerfile
    • *.yaml: Kubernetes configuration files (manual deployment)
  • helm: Helm chart for the entire application.
  • gcloud: Configuration for Google Cloud Platform.

• inventory-app-istio: Istio version. Contains several necessary application changes for Istio. If you want to use Istio, use and build all Docker images out of this sub-dir.

• presentation: Contains all files for the final presentation.

Commands

All commands used in the presentation video and further comands like configuration, deployment, upgrade, gcloud, istio can be found in presentation/README.md

Commands required to build the images

API

• docker build -t inventory-api:vX inventory-app/inventory-api/api-server/
• docker tag inventory-api:vX localhost:32000/inventory-api:vX
• docker push localhost:32000/inventory-api:vX

UI

• docker build -t inventory-ui:vX inventory-app/inventory-ui/ui-client/
• docker tag inventory-ui:vX localhost:32000/inventory-ui:vX
• docker push localhost:32000/inventory-ui:vX

DB

Not necessary. DockerHub image is used.

Commands required to deploy the Kubernetes application (HELM)

Preparation

• Create storage on hard disk before creating the volume and claim
  sudo mkdir -p /opt/postgre/data

• DNS entry at etc/hosts 127.0.0.1 inventory-app-helm.com api.inventory-app-helm.com

• TLS certificate (script or manually) sh inventory-app/scripts/create_certificate

Kubernetes

• 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