Three-Tier Application Demo

Overview

A demo of a simple three-tier application (Frontend -> Backend -> Database) to demonstrate platform capabilities.

Application Structure

• Project: demo-db
  • Database
    • VM: db (PostgreSQL)
• Project: demo-app
  • Frontend
    • VM: frontend (Bootstrap app)
    • Pod: frontend (Bootstrap app)
  • Backend
    • VM: backend-a (Flask + Gunicorn)
    • VM: backend-b (Flask + Gunicorn)

Security

• Component interaction is restricted by network policies.
• Application access requires authentication via Dex.

Users

• Application user: demo-user@flant.com
• demo-db project admin: demo-db-admin@flant.com
• demo-app project admin: demo-app-admin@flant.com

Repository Structure

• /apps - Frontend and backend source code
• /k8s - Kubernetes deployment manifests

Requirements

Ensure the following d8 modules are enabled and configured:

• admission-policy-engine
• cni-cilium
• console
• multitenancy-manager
• service-with-healthchecks
• user-authn
• virtualization

Installation

1. Create a .env file with infrastructure settings:

STORAGE_CLASS=linstor-thin-r1
PASSWORD=password
FQDN=demo.example.com

Install APP

task deploy

Uninstall APP

task undeploy

How to connect to VM

Via SSH

d8 v ssh -n demo-app cloud@frontend -i ./tmp/demo --local-ssh

Via console

d8 v console -n demo-app frontend

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